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EFFECT OF PALM OIL FUEL ASH (POFA) FINENESS ON THE MECHANICAL PROPERTIES OF CONCRETE
Jeffrey Lau Yong Lian
TP 684 Master in Engineering P3 (Civil) L366 2014 2014
UNIVERSITI MALAYSIA SARAWAK
Grade _____
Please tick (J)
Final Year Project Report D Masters IT] PhD D
DECLARATION OF ORIGINAL WORK
This declaration is made on the 28 day of AUG 2014
Students Declaration
I JEFFREY LAU YONG LIAN 14030081 FACULTY OF ENGINEERING hereby declare that this research project entitled EFFECT OF PALM OIL FUEL ASH (POFA) FINENESS ON THE MECHANICAL PROPERTIES OF CONCRETE is the result of my own research project work exclude for quotations and citations which have been duly acknowledged Besides that I also declare that it has not been previously or concurrently submitted for any other degree or award at Universiti Malaysia Sarawak or other institutions
Date 28 AUG 2014 JEFFREY LAU YONG LIAN (14030081)
Supervisors Declaration
I DR DELSYE TEO CHING LEE) hereby certifies that the work entitled EFFECT OF PALM OIL FUEL ASH (PO FA) FINENESS ON THE MECHANICAL PROPERTIES OF CONCRETE was prepared by the above named student and was submitted to the FACULTY as a partial fulfillment for the conferment of MASTER OF CIVIL ENGINEERING (CIVIL ENGINEERINGgt and the aforementioned work to the best of my knowledge is the said students work
Received for examination by ___________ Date 28 AUG 2014 DR DELSYE TEO CHING LEE
ii
I
I declare that Projectflhesis is classified as (Please tick (--raquo
D CONFIDENTIAL (Contains confidential information under the Official Secret Act 1972) DRESTRICTED (Contains restricted information as specified by the organisation where
research was done) QJ OPEN ACCESS
Validation of ProjectThesis
I therefore duly affirmed with free consent and willingness declare that this said Projectflhesis shall be placed officially in the Centre for Academic Information Services with the abiding interest and rights as follows
bull This ProjectThesis is the sole legal property of Universiti Malaysia Sarawak (UNIMAS) bull The Centre for Academic Information Services has the lawful right to make copies for the
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content for the Local Content Database bull The_Centre for Academic Information Services has the lawful right to make copies of the
Projectflhesis for academic exchange between Higher Learning Institute bull No dispute or any claim shall arise from the student itself neither third party on this
ProjectThesis once it becomes the sole property of UNIMAS bull This ProjectThesis or any material data and information related to it shall not be
distributed published or disclosed to any party by the student except with UNIMAS permission
rp~ckt middot~ Student signature ________~~ Supervisor signature _______
(28 AUG 2014) (28 AUG 2014)
Current Address 12E JALAN TEMEDAK 96000 SIBU SARA W AK MALAYSIA
Notes If the ProjectThesis is CONFIDENTIAL or RESTRICTED please attach together as annexure a letter from the organisation with the period and reasons of confidentiality and restriction
[The instrument is duly prepared by The Centre for Academic Information Services]
iii
--------------------------~---------~ -~---
L
ACKNOWLEDGEMENTS
First of all I would like to thank my supervisor Dr Delsye Teo Ching Lee for guiding and
assisting me throughout the entire research proj ect Besides that I would also like to thank
everyone who had contributed in conducting the various laboratory experimental tests In
addition I would also like to express my thanks to Serian Palm Oil Mill Sdn Bhd for
providing the palm oil fuel ash (PO FA) resources for my research project Moreover I would
like to thank my family for the support
iv
ABSTRACT
(palm oil industry in Malaysia is well known as the most important agricultural industry
Million tonnes of palm oil fuel ash (POF A) is being generated every year without any
profitable return POF A has the potential to be used as recycle materials due to their
pozzolanic behaviour Thus this research project presents the effect of palm oil fuel ash
(POFA) on the mechanical properties of concrete In this research project POF A was used as
supplementary cementing material to replace cement in concrete production This is because
POF A contains siliceous composition which produces a stronger and denser concrete Three
different fineness of POFA (passing through 38jUll 63jUll and 75jUll) were used to replace
ordinary portland cement at 15 by weight of cement throughout this research project In the
mix proportion a mix design ratio of 1 115295 (Cement Fine Aggregate Coarse Aggregate)
in term of weight of the components was constant for all mixtures In this research project
three laboratory experimentai tests were carried out namely slump test compressive strength
test and splitting tensile strength test The strength of POF A concrete are tested and
determined at 3 7 and 28 days Workability in terms of slump and strength properties of
POF A concrete were studied and compared with control specimen as well The study revealed
that POF A fmeness had significant effect on the workability and strength of concrete The test
results indicated th~ higher slump with higher fineness than those with lower fineness
Compressive strength and splitting tensile strength was found to increase with the increase of
POFA fineness Consequently it was found that POFA concrete produces lower strength than
OPC concrete
v
ABSTRAK
Industri minyak sawit di Malaysia terkenal sebagai industri pertanian yang paling penting
Juta tan abu bahan api kelapa sawit (POF A) sedang dijana setiap tahun tanpa apa-apa
pulangan yang menguntungkan POF A mempunyai potensi untuk digunakan sebagai bahan
kitar semula kerana tingkah laku pozzolanic mereka Oleh itu projek penyelidikan ini
memberikan kesan abu bahan api kelapa sawit (POF A) terhadap sifat mekanikal konkrit
Dalam projek kajian ini POF A telah digunakan sebagai bahan penyimenan tambahan untuk
menggantikan simen dalam konkrit Ini kerana POF A mengandungi komposisi bersilika yang
menghasilkan konkrit yang lebih kukuh dan lebih padat Tiga kehalusan POF A yang
berlainan (melalui 38 ~m 63lfl1 dan 75 1~m) telah digunakan untuk menggantikan simen
portland biasa pada 15 mengikut berat simen sepanjang projek penyelidikan ini Dalam
nisbah campuran nisbah reka bentuk campuran 1 115 295 (Cement Agregat Halus
Agregat Kasar) dari segi berat komponen adalah malar bagi semua campuran Dalam projek
penyelidikan ini tiga ujian ujikaji makmal yang telah dijalankan iaitu ujian kemerosotan
ujian kekuatan mampatan dan membelah ujian kekuatan tegangan Kekuatan konkrit POF A
diuji dan ditentukan pada 3 7 dan 28 hari Kebolehkerjaan dari segi kemerosotan kekuatan
dan sifat-sifat konkrit POF A telah dikaji dan dibandingkan dengan spesimen kawalan juga
Kajian ini mendedahkan bahawa POF A kehalusan mempunyai kesan yang besar ke atas kebolehkerjaan dan kekuatan konkrit Keputusan ujian menunjukkan kemerosotan yang lebih
tinggi dengan kehalusan yang lebih tinggi daripada yang dengan kehalusan yang lebih rendah
Kekuatan mampatan dan kekuatan tegangan membelah didapati meningkat dengan
peningkatan kehalusan POF A Oleh itu didapati bahawa POF A konkrit menghasilkan
kekuatan lebih rendah berbanding konkrit OPe
vi
Pusat Khidmat MakJumat Akademj) UlI1VERSITI MALAYSIA SARAW
TABLE OF CONTENTS
DECLARATION II II II II II bullbull II bullbullbull II II II II bullbullbullbullbullbullbullbull II bullbull II bullbull II II II II bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull II II II II II II II bullbullbullbullbullbullbullbullbullbullbullbull II bullbullbullbullbullbullbullbull U
ACKllOWLEDGEMENTI ivII II II bullbull II II II II II II II II II bullbullbullbullbull II bullbullbullbull II II II II II II II bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull II II II II II II bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull II bullbullbullbull
ABSTRACT II bullbullbullbullbull II bullbullbullbullbullbullbullbullbullbullbull II II II II bullbull II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II bullbull V
TABLE OF CONTENTS II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II bullbullbullbullbullbullbull vii
LIST OF TABLES XII II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II bullbullbullbullbullbullbull
LIST OF FIGURES xiII II II II II II II bullbullbullbullbullbullbullbullbullbullbullbullbull II II II II II II II II II II bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull
LIST OF APPENDICES xii
CHAPTER 1 INTRODUCTION
11 Introduction 1
12 Problem Statement 2
13 Research Significance bull 3
14 Aim and Objectives 3
15 Scope of Work 3
16 Thesis of organisation 4
CHAPTER 2 LITERA TURE REVIEW
21 Introdu~tion 6
22 Admixture 6
23 Types of Mineral Admixture (by-product material)
231 Fly ash 7
232 Blast-furnace slag 8
233 Silica Fume 9
vii
234 Rice Husk ash 9
24 The Physical Properties of POF A
241 Color 10
242 Specific gravity 11
243 Particle shape and size 11
244 Fineness 13
25 The Chemical Properties of PO FA 13
26 Effect of PO FA on the Fresh Properties of Concrete
261 Workability 14
27 Effect of PO FA on the Hardened Properties of Concrete
271 Compressive Strength 15
272 Splitting Tensile Strenampth 17
28 Effect of fineness on the Hardened Properties of concrete 18
29 Concluding Remarks 19
CHAPTER 3 METHODOLOGY
31 General 20
32 Material Properties Tests 20
33 Materials Used for Research Project
331 Palm Oil Fuel Ash (POFA) 21
332 Ordinary Portland Cement (OPC) 23
333 Fine Aggregate 23
viii
334 Coarse Aggregate 24
335 Water 25
34 Concrete Mix Proportions
341 Concrete Mixing 26
342 Concrete Casting 27
343 Concrete Curing 27
35 Fresh Concrete Test
351 Slump Test 27
36 Hardened Concrete Tests
361 Compressive Strength Test 27
362 Splitting Tensile Strength Test 28
CHAPTER 4 RESULTS AND DISCUSSION
41 Introduction 29
42 The Effects of PO FA Fineness on Workability of Concrete 29
43 The Effects of PO FA fmeness on Compressive Strength of Concrete 30
44 The Effects of POF A Fineness on Splitting Tensile Strength of Concre 34
CHAPTER 5 CONCLUSIONS AND RECOMMENDA nONS
51 Conclusions 38
52 Recommendations 39
REFERENCES 41
APPENDICES ~ 45
ix
LIST OF TABLES
Table 21 Physical properties ofunground and ground POFA (Safiuddin et aI 2011) 10
Table 22 Chemical composition ofOPC and PO FA (Source Awal 1997 Tangchirapat
Table 23 Effect of POF A on the workability of concrete (Eldagal 2008 Sata et aI 2007
2007 Eldagal 2008) 14
Tay1990) 15
Table 31 Aggregates Properties Laboratory Tests 21
Table 32 Chemical composition of OPC ASTM Type 1 23
Table 33 Physical properties of fine aggregate 23
Table 34 Physical properties of coarse aggregate 24
Table 35 Mix Proportion 26
Table 41 Slump 29
Table 42 Compressive strength for 3 7 and 28 days 31
Table 43 Splitting tensile strength for 3 7 and 28 days 35
x
LIST OF FIGURES
Figure 21 OPC (Chindaprasirt et aI 2007) 12
Figure 24 Particle size distribution ofunground and ground POFA and OPC (Sata et aI
Figure 25 Effect ofunground POFA on the compressive strength of concrete at 28 days (Tay
Figure 26 Effect of ground POF A on the compressive strength at different test ages
Figure 27 Effect of ground POFA on the splitting tensile strength of concrete (Sata et aI
Figure 22 Unground POF A (Jaturapitakkul et aI 2007) 12
Fjgure 23 Ground POFA Jaturapitakkul et aI 2007) 12
2004) 12
1990) 17
(Tangchirapat et aI 2009) 17
2007) 18
Figure 31 POFA 22
Figure 32 Sieved POFA 22
Figure 33 Sieve analysis for sand 24
Figure 34 Sieve analysis for coarse aggregate 25
Figure 41 The Slump 30
Figure 42 Compressive Strength for 3 7 and 28 days 33
Figure 43 Splitting Tensile Strength for 3 7 and 28 days 37
LIST OF APPENDICES
APPENDIX A Processes of Specific Gravity of Coarse Aggregate 45
APPENDIX B Processes of Specific Gravity of Fine Aggreagte 46
APPENDIX C Processes of Concrete Mixing Casting and Curing 48
APPENDIX D Processes of Slump Test 50
APPENDIX E Processes of Compressive Strength Test 51
APPENDIX F Processes of Splitting Tensile Strength Test 52
xii
CHAPTER 1
INTRODUCTION
11 Introduction
Concrete is usually a composite material that is used in civil engineering construction work It
is typically a mixture of cement water aggregate and also other admixtures Concrete is
strong in compression because the aggregate has the ability to carry the compression load
however it is extremely weak in tension
Cement consists of adhesive and cohesive properties which enable it to bond mineral
fragments into a solid mass Cement contains silicates and aluminates of lime which are made
from blended and ground limestone and clay According to Dobrowolski (1998) portland
cement is the most commonly used hydraulic ~ement for making concrete around the world It
is considered as the most significant component of hydraulic cement which hardens due to
hydration a chemical reaction between cement powder and water In concrete design and
quality control strength is the property usually specified The water-cementitious materials
ratio the extent of hydration the curing and environmental conditions are the main factors
that influence the strength of concrete The ultimate compressive strength and rate of strength
development of concrete are also greatly dependent on the chemical and physical properties of
the cement
Higher demands for construction works have contributed to augmentation of cement
production as one of the main components of concrete manufacture As a result the
production of cement leads to increase the concern of global warming as CO2 emission is
released to atmosphere However the variety of studies about various supplementary
1
cementing material involved in concrete production has been conducted in recent years
Nowadays the use of various supplementary cementing materials such as Fly Ash Blastshy
Furnace Slag Silica Fume Rice husk Ash and other fiber and pozzolanic material are gaining
popularity due to increasingly stringent environmental legislation In addition the use of
various supplementary cementing materials is also a common practice since they are
significantly reducing the cement content and improve the ultimate strength of the concrete
In this study the study about the use of Palm Oil Fuel Ash (POF A) as a supplementary
cementing material in concrete production is carried out The influence of POF A and its
degree of fmeness on the mechanical properties of concrete is investigated In Malaysia palm
oil industry is considered as the most important agro industries POF A is a by-product which
is generated from the combustion of palm oil plant residues In this study POF A is used as a
pozzolanic material and also a replacement of cement in concrete to produce cementitious
properties Pozzolan is defined as a siliceous or siliceous and aluminous material where the
particles react with calcium hydroxide from the cement to produce cementitious properties
The utilization of pozzolanic material in concrete would reduce the negative environmental
effect and landfill volume for the disposal of wastes
12 Problem Statement
The presence of palm oil wastes has created a major disposal problem due to a large amount
of solid waste materials is produced such as palm fiber nutshells and empty fruit bunches
from palm oil industry which is burnt at temperatures of about 800-1000 degC as fuels to
provide steam for electricity generation in palm oil mills After the burning process an ash
by-product are obtained which is about 5 by weight of the residues known as palm oil fuel
ash (pOF A) It has been reported that around 4 million tonsyears of POF A are produced in
2
Malaysia only (Zarina 2012) While the quantity of PO FA is rising annually its utilization is
limited and basically disposed of as a waste in landfills without any profitable return It can
also affect environmental problems such as health hazards and financial loss
13 Research Significance
There are several significances in this research project Firstly PDFA is incorporated as
supplementary cementing material in the concrete mix as to promote the use of agricultural
waste and create a more sustainable environment besides its own ability to improve strength
development of concrete Next it is also important that to obtain a mix proportion to produce
concrete incorporated with PDFA and studies the mechanical properties of concrete in term of
compressive strength and splitting tensile strength
14 Aim and Objectives
The aim of this research project is to conduct an experimental testing program to determine
the effects of PDFA fineness on the mechanical properties of concrete The objectives of the
research project are
1 To obtain a mix proportion containing different PDFA fineness which can achieve a
targeted strength of 30 Nmm2 at 28 days and slump of 60mm-180mm
II To study the mechanical properties of concr~te by using POFA with 3 different
fineness which are passing through 38wn 631m and 751m
1S Scope of work
The study focuses on the effect of PDFA fineness on the mechanical properties of concrete
The study only limited to test for three types of PDFA fineness which are 381m 631ffi and
3
75JlM with 15 PDFA replacement Three laboratories experimental tests is carried out
namely slump test compressive strength test and splitting tensile strength test The slump test
is carried out to detennine the workability of fresh concrete The concrete sample is cured in
the water and tested for 3 days 7 days and 28 days strength Consequently two mechanical
properties of concrete such as compressive strength and splitting tensile strength will be tested
in this study
16 Thesis Organisation
This report contains five chapters which are introduction literature review methodology
result and discussion and conclusion respectively
Chapter I discuss the general background of the research problem statement scope of work
aim and objectives and thesis significance
Chapter 2 discuss the admixture which is also one of the components of concrete mix Besides
that a general background for four types of pozzolanic materials such as fly ash blast furnace
slag silica fume and rice husk ash will be discussed in this chapter In addition the properties
of PDF A such as physical and chemical composition will also be discussed in this chapter
Moreover a previous study about the effect of PDF A on the mechanical properties of
concrete will be studied Lastly a previous research about the effect of fineness on properties
ofconcrete will be also discussed
Chapter 3 explain various laboratory tests will be carried out in this chapter In this chapter
three laboratory experiments will be conducted such as slump test compressive strength test
and splitting tensile strength test In addition experiment setups will be stated in this chapter
4
r-~-------~-----p~rKhldmat Mak1umat Akauemillt UNIVERSrn MALAYSIA SAltAWAIlt
Chapter 4 generally presents and discusses about the result of each laboratory tests that
conducted in tenn of compressive strength and splitting tensile strength
Chapter 5 conclude the whole study has been conducted A conclusion has been drawn with
relevant objectives stated based on the result achieved from this study Besides that there are
few recommendations will be listed in this chapter
5
CHAPTER 2
LITERATURE REVIEW
21 Introduction
During recent decades there are many researchers have been carried out for the use of
admixture in concrete mixture such as fly ash blast-furnace slag silica fume rice husk ash
and also palm oil fuel ash Besides that the properties of POF A are also briefly discussed and
previous study about the effects of POF A on the mechanical properties of concrete are also
reviewed Lastly previous study about the effects of fineness on the properties of concrete are
also reviewed
22 Admixture
Admixture is used as an additional material which is added to concrete mixtures It is varying
widely in chemical composition from surfactants and soluble salts to polymers and insoluble
minerals The properties of concrete such as workability strength and durability can be
improved by adding admixtures to concrete batch (Monte rio amp Mehta 2006) Besides that
the use of admixture in concrete mixtures may also increase or decrease the cost of concrete
by lowering the required cement content changing the volume of the concrete mixture or
reducing the cost of concrete placing and finishing Thus admixture plays an important role
in concrete mixtures Admixture can be categorised into 2 categorise which is mineral
admixture (fly ash silica fume and others) and chemical admixture (air-entering agents
accelerators water-reducing admixtures However mineral admixtures are more emphasized
in this study and used as supplementary cementitious material for producing concrete
6
Mineral admixtures are categorised into 2 classifications which are natural materials and byshy
product materials Some mineral admixtures can be pozzolanic cementitious and however
others are both cementitious and pozzolanic (Monterio amp Mehta 2006) Natural materials are
defined as a material that has been treated for the only purpose of making a pozzolan
Generally the process involves crushing grinding and size separation occasionally it may
also include thermal activation On the other hand by-product materials are defined as a
material that is not the primary products which produced from industry It mayor may not
require any processing before use as mineral admixtures
However by-product materials are more highlighted in this study Consequently the physiGal
and chemical and mineralogical properties of palm oil fuel ash (PDF A) will be further
discussed in this study Besides that effect of PDF A on the mechanical properties of concrete
will be also discussed in this study
23 Types of Mineral Admixtures from By-product
A variety of by-product materials such as fly ash blast-furnace slag silica fume rice husk ash
and others have been commonly used as pozzolanic materials in concrete The utilization of
pozzolanic material not only enhances the properties of concrete but also protects the
environment
231 Fly Ash
According to Day (2006) fly ash is also known as pulverized fuel ash which is produced from
the combustion of coal in thermal power plants During combustion the mineral impurities
such as clays quartz and feldspar melt in suspension at the high temperature and float out
with the flue gas stream As the fused material rises it is transported to low temperature zones
7
allow it cools and then it solidifies as spherical particles of glass which are called fly ash This
fly ash is collected from the flue gas stream by mechanical separators electrostatic
precipitation or bag filters (Nawy 2008) Fly ash can be categorised into two different types
which are Class C and Class F (ASTM C 618-78) Class C ash is consists of high-calcium fly
ashes with carbon content less than 2 while Class F ash contains low-calcium fly ashes
with carbon content less than 5 but sometimes as high as 10 Class C ash is usually
obtained from burning sub-bituminous or lignite coals whereas Class F ashes are obtained
from burning bituminous or anthracite coals The chemical and physical properties of the ash
have significant impact on the performance properties between Class F and C ashes The
physical properties of fly ashes are depending to the source Fly ash is a fine-grained material
which contains spherical glassy particles The particles can be irregular or angular shapes and
its size is depending on the sources The particles of fly ash may be finer or coarser than
Portland cement particles On the other hand the mineralogical properties of fly ash are
significant influenced by both the type and source of fly ash Fly ash contains noncrystalline
particles or glass and a small quantity of crystalline material as result from the rapid cooling
ofburned coal in the power plant
232 Blast-Furnace Slag
Blast-furnace slag is a by-product of the production of iron (Nawy 2008) When it is quickly
cool down with water to glassy state and finely ground thus the property of latent
hydraulicity will be developed (Nawy 2008) Nowadays the use of blast-furnace slag as an
admixture in concrete is well established In the early 1970s glassy slag was produced by
using pelletizing process which uses much less water than granulation methods Firstly a
treatment with water sprays is used to expand the molten slag and then passed over a rotating
8
fInned drum Lastly the semi molten material is cooled and pelletized by throwing them into
the air
233 SUtea Fume
Silica fume is a byproduct of the production of metallic silicon or ferrosilicon alloys which is
produced by electric arc furnaces (Nawy 2008) The two main components such as the types
of alloy fonned and the composition of quartz and coal are commonly used in the electric arc
furnaces which are significantly influence the chemical composition of silica fume The
majority ofpublished data indicates that the utilization of silica fume in concrete must contain
at least 75 ferro silicon
234 Rice Husk Ash
Rice husk ash is a by-product of the agricultural industry which is produced from burning a
mixture of rice husk and eucalyptus bark by fluidized bed combustion process in a biomass
power plant It consists of high amount of Si02 Silica content in the ash increases with higher
the burning temperature Many researches described that rice husk ash consists of high
reactivity and pozzolanic property after burning process at controlled temperature Chemical
composition of rice husk ash is greatly influenced by the temperature during burning
processes
24 The PbysieaJ Properties of POFA
According to AbdullaH et al (2006) the burning temperature condition is one of factors that
significantly influence the physical properties of POFA Several of physical properties of
9
Wlground and ground POF A used in various studies are shown in Table 21 These all
properties ofunground and ground POFA are briefly discussed below
Table 21 Physical properties of unground and ground POF A (Safiuddin et al 2011)
Properties OPC Unground POFA Ground PO FA
Color Grey Light greywhitish Dark grey
Specific gravity 314-328 178-197 222-278
Median particle size dso(urn) 10-20 543-183 72-101
Passing through 45-urn sieve 56-588 97-99
( mass)
Specific surface area Blaine 314-358 796 882-1244
(m2kg)
Strength activity index () 786-115
SOWldness Le Chatelier 045-1 05-26
expansion (mm)
141 Color
UngroWld POF A is usually in light grey color as results from the unburnt carbon content left
at relatively low burning temperature The content of unburnt carbon becomes very low when
the burning temperature is high Besides that unground POF A can also be whitish color in the
absence of unburnt carbon (Abdullah et al 2006) On the other hand ground POF A is dark
grey color
10
141 Specific Gravity
The specific gravity of unground POFA is normally varies in the range of 178-197 From
Table 21 above it can be seen that the specific gravity of unground POF A is about 40
lower than the specific gravity of ope (Tay 1990) However the specific gravity of POF A is
increased and it is about in the range of 222-278 after the grinding process (Sata et al 2004
Tangchirapat et al 2009) It is because the particle size of POF A is reduced and then the
porosity also decreased as results from grinding processes
143 Particle Shape and Size
The particle shape and size of unground POF A is different as compare to ground POF A It
was found that the particle shape and size are mostly large spherical and porous as shown in
Figure 22 In contrast ground POF A is quite similar to Portland cement which crushed
particle is usually in irregular and angular shape as shown in Figure 21 amp 23 ( Chindaprasirt
et al 2007) The particle size of unground POFA is larger than OPC however the particle
size of ground POF A is smaller than OPe The typical particle size distributions of unground
and ground POF A and ope are shown in Figure 24 The median particle size of unground
POFA is about 543)lm -183)lm which is larger than ope which is in the range of I011m -20
1Jlll However the particle size of POFA is decreased to 72)lffi -lO1)lm after grinding
processes (Sata et al 2004 Chindaprasit et at 2008)
11
Figure 21 OPC (Chindaprasirt et ai 2007) Figure 22 Unground POFA (Jaturapitakkul
et ai 2007)
Figure 23 Ground POFA (Jaturapitakkul et ai 2007)
100 r==III~~iITinTI-1M-7I1
II
rriTiT11 Ground POFA JIl jill
90 ope mill J UOOUnd POFA t++tt+-l~I11H80 III IIT~+IIiI--+++IH
70 ~~t+~~UU~~~I IIIV-J~~U oo ~~U~~~Hm+M~~~I~~~
50 +-+tttlitl t-+-Ii+Itflt-+f+TMIlH-i++IHIt-I+tt+Ilt-i~ 1JlIIlt~ 40 +-r-lliM-=-+WII--l-+4R-++I r-H+fllf-++I I N+-i
~ ~~~I~~~~~J~Ir+~ 2o ~~~~~~~~~~~~~~~I I10 ~~~~~~A~~~_I_I~~~ o 1 w
001 01 10 00 1000 10000
Particle size (~m)
Figure 24 Particle size distribution of un ground and ground POFA and OPC (Sata et ai
2004)
12
UNIVERSITI MALAYSIA SARAWAK
Grade _____
Please tick (J)
Final Year Project Report D Masters IT] PhD D
DECLARATION OF ORIGINAL WORK
This declaration is made on the 28 day of AUG 2014
Students Declaration
I JEFFREY LAU YONG LIAN 14030081 FACULTY OF ENGINEERING hereby declare that this research project entitled EFFECT OF PALM OIL FUEL ASH (POFA) FINENESS ON THE MECHANICAL PROPERTIES OF CONCRETE is the result of my own research project work exclude for quotations and citations which have been duly acknowledged Besides that I also declare that it has not been previously or concurrently submitted for any other degree or award at Universiti Malaysia Sarawak or other institutions
Date 28 AUG 2014 JEFFREY LAU YONG LIAN (14030081)
Supervisors Declaration
I DR DELSYE TEO CHING LEE) hereby certifies that the work entitled EFFECT OF PALM OIL FUEL ASH (PO FA) FINENESS ON THE MECHANICAL PROPERTIES OF CONCRETE was prepared by the above named student and was submitted to the FACULTY as a partial fulfillment for the conferment of MASTER OF CIVIL ENGINEERING (CIVIL ENGINEERINGgt and the aforementioned work to the best of my knowledge is the said students work
Received for examination by ___________ Date 28 AUG 2014 DR DELSYE TEO CHING LEE
ii
I
I declare that Projectflhesis is classified as (Please tick (--raquo
D CONFIDENTIAL (Contains confidential information under the Official Secret Act 1972) DRESTRICTED (Contains restricted information as specified by the organisation where
research was done) QJ OPEN ACCESS
Validation of ProjectThesis
I therefore duly affirmed with free consent and willingness declare that this said Projectflhesis shall be placed officially in the Centre for Academic Information Services with the abiding interest and rights as follows
bull This ProjectThesis is the sole legal property of Universiti Malaysia Sarawak (UNIMAS) bull The Centre for Academic Information Services has the lawful right to make copies for the
purpose of academic and research only and not for other purpose bull The Centre for Academic Information Services has the lawful right to digitalise the
content for the Local Content Database bull The_Centre for Academic Information Services has the lawful right to make copies of the
Projectflhesis for academic exchange between Higher Learning Institute bull No dispute or any claim shall arise from the student itself neither third party on this
ProjectThesis once it becomes the sole property of UNIMAS bull This ProjectThesis or any material data and information related to it shall not be
distributed published or disclosed to any party by the student except with UNIMAS permission
rp~ckt middot~ Student signature ________~~ Supervisor signature _______
(28 AUG 2014) (28 AUG 2014)
Current Address 12E JALAN TEMEDAK 96000 SIBU SARA W AK MALAYSIA
Notes If the ProjectThesis is CONFIDENTIAL or RESTRICTED please attach together as annexure a letter from the organisation with the period and reasons of confidentiality and restriction
[The instrument is duly prepared by The Centre for Academic Information Services]
iii
--------------------------~---------~ -~---
L
ACKNOWLEDGEMENTS
First of all I would like to thank my supervisor Dr Delsye Teo Ching Lee for guiding and
assisting me throughout the entire research proj ect Besides that I would also like to thank
everyone who had contributed in conducting the various laboratory experimental tests In
addition I would also like to express my thanks to Serian Palm Oil Mill Sdn Bhd for
providing the palm oil fuel ash (PO FA) resources for my research project Moreover I would
like to thank my family for the support
iv
ABSTRACT
(palm oil industry in Malaysia is well known as the most important agricultural industry
Million tonnes of palm oil fuel ash (POF A) is being generated every year without any
profitable return POF A has the potential to be used as recycle materials due to their
pozzolanic behaviour Thus this research project presents the effect of palm oil fuel ash
(POFA) on the mechanical properties of concrete In this research project POF A was used as
supplementary cementing material to replace cement in concrete production This is because
POF A contains siliceous composition which produces a stronger and denser concrete Three
different fineness of POFA (passing through 38jUll 63jUll and 75jUll) were used to replace
ordinary portland cement at 15 by weight of cement throughout this research project In the
mix proportion a mix design ratio of 1 115295 (Cement Fine Aggregate Coarse Aggregate)
in term of weight of the components was constant for all mixtures In this research project
three laboratory experimentai tests were carried out namely slump test compressive strength
test and splitting tensile strength test The strength of POF A concrete are tested and
determined at 3 7 and 28 days Workability in terms of slump and strength properties of
POF A concrete were studied and compared with control specimen as well The study revealed
that POF A fmeness had significant effect on the workability and strength of concrete The test
results indicated th~ higher slump with higher fineness than those with lower fineness
Compressive strength and splitting tensile strength was found to increase with the increase of
POFA fineness Consequently it was found that POFA concrete produces lower strength than
OPC concrete
v
ABSTRAK
Industri minyak sawit di Malaysia terkenal sebagai industri pertanian yang paling penting
Juta tan abu bahan api kelapa sawit (POF A) sedang dijana setiap tahun tanpa apa-apa
pulangan yang menguntungkan POF A mempunyai potensi untuk digunakan sebagai bahan
kitar semula kerana tingkah laku pozzolanic mereka Oleh itu projek penyelidikan ini
memberikan kesan abu bahan api kelapa sawit (POF A) terhadap sifat mekanikal konkrit
Dalam projek kajian ini POF A telah digunakan sebagai bahan penyimenan tambahan untuk
menggantikan simen dalam konkrit Ini kerana POF A mengandungi komposisi bersilika yang
menghasilkan konkrit yang lebih kukuh dan lebih padat Tiga kehalusan POF A yang
berlainan (melalui 38 ~m 63lfl1 dan 75 1~m) telah digunakan untuk menggantikan simen
portland biasa pada 15 mengikut berat simen sepanjang projek penyelidikan ini Dalam
nisbah campuran nisbah reka bentuk campuran 1 115 295 (Cement Agregat Halus
Agregat Kasar) dari segi berat komponen adalah malar bagi semua campuran Dalam projek
penyelidikan ini tiga ujian ujikaji makmal yang telah dijalankan iaitu ujian kemerosotan
ujian kekuatan mampatan dan membelah ujian kekuatan tegangan Kekuatan konkrit POF A
diuji dan ditentukan pada 3 7 dan 28 hari Kebolehkerjaan dari segi kemerosotan kekuatan
dan sifat-sifat konkrit POF A telah dikaji dan dibandingkan dengan spesimen kawalan juga
Kajian ini mendedahkan bahawa POF A kehalusan mempunyai kesan yang besar ke atas kebolehkerjaan dan kekuatan konkrit Keputusan ujian menunjukkan kemerosotan yang lebih
tinggi dengan kehalusan yang lebih tinggi daripada yang dengan kehalusan yang lebih rendah
Kekuatan mampatan dan kekuatan tegangan membelah didapati meningkat dengan
peningkatan kehalusan POF A Oleh itu didapati bahawa POF A konkrit menghasilkan
kekuatan lebih rendah berbanding konkrit OPe
vi
Pusat Khidmat MakJumat Akademj) UlI1VERSITI MALAYSIA SARAW
TABLE OF CONTENTS
DECLARATION II II II II II bullbull II bullbullbull II II II II bullbullbullbullbullbullbullbull II bullbull II bullbull II II II II bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull II II II II II II II bullbullbullbullbullbullbullbullbullbullbullbull II bullbullbullbullbullbullbullbull U
ACKllOWLEDGEMENTI ivII II II bullbull II II II II II II II II II bullbullbullbullbull II bullbullbullbull II II II II II II II bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull II II II II II II bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull II bullbullbullbull
ABSTRACT II bullbullbullbullbull II bullbullbullbullbullbullbullbullbullbullbull II II II II bullbull II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II bullbull V
TABLE OF CONTENTS II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II bullbullbullbullbullbullbull vii
LIST OF TABLES XII II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II bullbullbullbullbullbullbull
LIST OF FIGURES xiII II II II II II II bullbullbullbullbullbullbullbullbullbullbullbullbull II II II II II II II II II II bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull
LIST OF APPENDICES xii
CHAPTER 1 INTRODUCTION
11 Introduction 1
12 Problem Statement 2
13 Research Significance bull 3
14 Aim and Objectives 3
15 Scope of Work 3
16 Thesis of organisation 4
CHAPTER 2 LITERA TURE REVIEW
21 Introdu~tion 6
22 Admixture 6
23 Types of Mineral Admixture (by-product material)
231 Fly ash 7
232 Blast-furnace slag 8
233 Silica Fume 9
vii
234 Rice Husk ash 9
24 The Physical Properties of POF A
241 Color 10
242 Specific gravity 11
243 Particle shape and size 11
244 Fineness 13
25 The Chemical Properties of PO FA 13
26 Effect of PO FA on the Fresh Properties of Concrete
261 Workability 14
27 Effect of PO FA on the Hardened Properties of Concrete
271 Compressive Strength 15
272 Splitting Tensile Strenampth 17
28 Effect of fineness on the Hardened Properties of concrete 18
29 Concluding Remarks 19
CHAPTER 3 METHODOLOGY
31 General 20
32 Material Properties Tests 20
33 Materials Used for Research Project
331 Palm Oil Fuel Ash (POFA) 21
332 Ordinary Portland Cement (OPC) 23
333 Fine Aggregate 23
viii
334 Coarse Aggregate 24
335 Water 25
34 Concrete Mix Proportions
341 Concrete Mixing 26
342 Concrete Casting 27
343 Concrete Curing 27
35 Fresh Concrete Test
351 Slump Test 27
36 Hardened Concrete Tests
361 Compressive Strength Test 27
362 Splitting Tensile Strength Test 28
CHAPTER 4 RESULTS AND DISCUSSION
41 Introduction 29
42 The Effects of PO FA Fineness on Workability of Concrete 29
43 The Effects of PO FA fmeness on Compressive Strength of Concrete 30
44 The Effects of POF A Fineness on Splitting Tensile Strength of Concre 34
CHAPTER 5 CONCLUSIONS AND RECOMMENDA nONS
51 Conclusions 38
52 Recommendations 39
REFERENCES 41
APPENDICES ~ 45
ix
LIST OF TABLES
Table 21 Physical properties ofunground and ground POFA (Safiuddin et aI 2011) 10
Table 22 Chemical composition ofOPC and PO FA (Source Awal 1997 Tangchirapat
Table 23 Effect of POF A on the workability of concrete (Eldagal 2008 Sata et aI 2007
2007 Eldagal 2008) 14
Tay1990) 15
Table 31 Aggregates Properties Laboratory Tests 21
Table 32 Chemical composition of OPC ASTM Type 1 23
Table 33 Physical properties of fine aggregate 23
Table 34 Physical properties of coarse aggregate 24
Table 35 Mix Proportion 26
Table 41 Slump 29
Table 42 Compressive strength for 3 7 and 28 days 31
Table 43 Splitting tensile strength for 3 7 and 28 days 35
x
LIST OF FIGURES
Figure 21 OPC (Chindaprasirt et aI 2007) 12
Figure 24 Particle size distribution ofunground and ground POFA and OPC (Sata et aI
Figure 25 Effect ofunground POFA on the compressive strength of concrete at 28 days (Tay
Figure 26 Effect of ground POF A on the compressive strength at different test ages
Figure 27 Effect of ground POFA on the splitting tensile strength of concrete (Sata et aI
Figure 22 Unground POF A (Jaturapitakkul et aI 2007) 12
Fjgure 23 Ground POFA Jaturapitakkul et aI 2007) 12
2004) 12
1990) 17
(Tangchirapat et aI 2009) 17
2007) 18
Figure 31 POFA 22
Figure 32 Sieved POFA 22
Figure 33 Sieve analysis for sand 24
Figure 34 Sieve analysis for coarse aggregate 25
Figure 41 The Slump 30
Figure 42 Compressive Strength for 3 7 and 28 days 33
Figure 43 Splitting Tensile Strength for 3 7 and 28 days 37
LIST OF APPENDICES
APPENDIX A Processes of Specific Gravity of Coarse Aggregate 45
APPENDIX B Processes of Specific Gravity of Fine Aggreagte 46
APPENDIX C Processes of Concrete Mixing Casting and Curing 48
APPENDIX D Processes of Slump Test 50
APPENDIX E Processes of Compressive Strength Test 51
APPENDIX F Processes of Splitting Tensile Strength Test 52
xii
CHAPTER 1
INTRODUCTION
11 Introduction
Concrete is usually a composite material that is used in civil engineering construction work It
is typically a mixture of cement water aggregate and also other admixtures Concrete is
strong in compression because the aggregate has the ability to carry the compression load
however it is extremely weak in tension
Cement consists of adhesive and cohesive properties which enable it to bond mineral
fragments into a solid mass Cement contains silicates and aluminates of lime which are made
from blended and ground limestone and clay According to Dobrowolski (1998) portland
cement is the most commonly used hydraulic ~ement for making concrete around the world It
is considered as the most significant component of hydraulic cement which hardens due to
hydration a chemical reaction between cement powder and water In concrete design and
quality control strength is the property usually specified The water-cementitious materials
ratio the extent of hydration the curing and environmental conditions are the main factors
that influence the strength of concrete The ultimate compressive strength and rate of strength
development of concrete are also greatly dependent on the chemical and physical properties of
the cement
Higher demands for construction works have contributed to augmentation of cement
production as one of the main components of concrete manufacture As a result the
production of cement leads to increase the concern of global warming as CO2 emission is
released to atmosphere However the variety of studies about various supplementary
1
cementing material involved in concrete production has been conducted in recent years
Nowadays the use of various supplementary cementing materials such as Fly Ash Blastshy
Furnace Slag Silica Fume Rice husk Ash and other fiber and pozzolanic material are gaining
popularity due to increasingly stringent environmental legislation In addition the use of
various supplementary cementing materials is also a common practice since they are
significantly reducing the cement content and improve the ultimate strength of the concrete
In this study the study about the use of Palm Oil Fuel Ash (POF A) as a supplementary
cementing material in concrete production is carried out The influence of POF A and its
degree of fmeness on the mechanical properties of concrete is investigated In Malaysia palm
oil industry is considered as the most important agro industries POF A is a by-product which
is generated from the combustion of palm oil plant residues In this study POF A is used as a
pozzolanic material and also a replacement of cement in concrete to produce cementitious
properties Pozzolan is defined as a siliceous or siliceous and aluminous material where the
particles react with calcium hydroxide from the cement to produce cementitious properties
The utilization of pozzolanic material in concrete would reduce the negative environmental
effect and landfill volume for the disposal of wastes
12 Problem Statement
The presence of palm oil wastes has created a major disposal problem due to a large amount
of solid waste materials is produced such as palm fiber nutshells and empty fruit bunches
from palm oil industry which is burnt at temperatures of about 800-1000 degC as fuels to
provide steam for electricity generation in palm oil mills After the burning process an ash
by-product are obtained which is about 5 by weight of the residues known as palm oil fuel
ash (pOF A) It has been reported that around 4 million tonsyears of POF A are produced in
2
Malaysia only (Zarina 2012) While the quantity of PO FA is rising annually its utilization is
limited and basically disposed of as a waste in landfills without any profitable return It can
also affect environmental problems such as health hazards and financial loss
13 Research Significance
There are several significances in this research project Firstly PDFA is incorporated as
supplementary cementing material in the concrete mix as to promote the use of agricultural
waste and create a more sustainable environment besides its own ability to improve strength
development of concrete Next it is also important that to obtain a mix proportion to produce
concrete incorporated with PDFA and studies the mechanical properties of concrete in term of
compressive strength and splitting tensile strength
14 Aim and Objectives
The aim of this research project is to conduct an experimental testing program to determine
the effects of PDFA fineness on the mechanical properties of concrete The objectives of the
research project are
1 To obtain a mix proportion containing different PDFA fineness which can achieve a
targeted strength of 30 Nmm2 at 28 days and slump of 60mm-180mm
II To study the mechanical properties of concr~te by using POFA with 3 different
fineness which are passing through 38wn 631m and 751m
1S Scope of work
The study focuses on the effect of PDFA fineness on the mechanical properties of concrete
The study only limited to test for three types of PDFA fineness which are 381m 631ffi and
3
75JlM with 15 PDFA replacement Three laboratories experimental tests is carried out
namely slump test compressive strength test and splitting tensile strength test The slump test
is carried out to detennine the workability of fresh concrete The concrete sample is cured in
the water and tested for 3 days 7 days and 28 days strength Consequently two mechanical
properties of concrete such as compressive strength and splitting tensile strength will be tested
in this study
16 Thesis Organisation
This report contains five chapters which are introduction literature review methodology
result and discussion and conclusion respectively
Chapter I discuss the general background of the research problem statement scope of work
aim and objectives and thesis significance
Chapter 2 discuss the admixture which is also one of the components of concrete mix Besides
that a general background for four types of pozzolanic materials such as fly ash blast furnace
slag silica fume and rice husk ash will be discussed in this chapter In addition the properties
of PDF A such as physical and chemical composition will also be discussed in this chapter
Moreover a previous study about the effect of PDF A on the mechanical properties of
concrete will be studied Lastly a previous research about the effect of fineness on properties
ofconcrete will be also discussed
Chapter 3 explain various laboratory tests will be carried out in this chapter In this chapter
three laboratory experiments will be conducted such as slump test compressive strength test
and splitting tensile strength test In addition experiment setups will be stated in this chapter
4
r-~-------~-----p~rKhldmat Mak1umat Akauemillt UNIVERSrn MALAYSIA SAltAWAIlt
Chapter 4 generally presents and discusses about the result of each laboratory tests that
conducted in tenn of compressive strength and splitting tensile strength
Chapter 5 conclude the whole study has been conducted A conclusion has been drawn with
relevant objectives stated based on the result achieved from this study Besides that there are
few recommendations will be listed in this chapter
5
CHAPTER 2
LITERATURE REVIEW
21 Introduction
During recent decades there are many researchers have been carried out for the use of
admixture in concrete mixture such as fly ash blast-furnace slag silica fume rice husk ash
and also palm oil fuel ash Besides that the properties of POF A are also briefly discussed and
previous study about the effects of POF A on the mechanical properties of concrete are also
reviewed Lastly previous study about the effects of fineness on the properties of concrete are
also reviewed
22 Admixture
Admixture is used as an additional material which is added to concrete mixtures It is varying
widely in chemical composition from surfactants and soluble salts to polymers and insoluble
minerals The properties of concrete such as workability strength and durability can be
improved by adding admixtures to concrete batch (Monte rio amp Mehta 2006) Besides that
the use of admixture in concrete mixtures may also increase or decrease the cost of concrete
by lowering the required cement content changing the volume of the concrete mixture or
reducing the cost of concrete placing and finishing Thus admixture plays an important role
in concrete mixtures Admixture can be categorised into 2 categorise which is mineral
admixture (fly ash silica fume and others) and chemical admixture (air-entering agents
accelerators water-reducing admixtures However mineral admixtures are more emphasized
in this study and used as supplementary cementitious material for producing concrete
6
Mineral admixtures are categorised into 2 classifications which are natural materials and byshy
product materials Some mineral admixtures can be pozzolanic cementitious and however
others are both cementitious and pozzolanic (Monterio amp Mehta 2006) Natural materials are
defined as a material that has been treated for the only purpose of making a pozzolan
Generally the process involves crushing grinding and size separation occasionally it may
also include thermal activation On the other hand by-product materials are defined as a
material that is not the primary products which produced from industry It mayor may not
require any processing before use as mineral admixtures
However by-product materials are more highlighted in this study Consequently the physiGal
and chemical and mineralogical properties of palm oil fuel ash (PDF A) will be further
discussed in this study Besides that effect of PDF A on the mechanical properties of concrete
will be also discussed in this study
23 Types of Mineral Admixtures from By-product
A variety of by-product materials such as fly ash blast-furnace slag silica fume rice husk ash
and others have been commonly used as pozzolanic materials in concrete The utilization of
pozzolanic material not only enhances the properties of concrete but also protects the
environment
231 Fly Ash
According to Day (2006) fly ash is also known as pulverized fuel ash which is produced from
the combustion of coal in thermal power plants During combustion the mineral impurities
such as clays quartz and feldspar melt in suspension at the high temperature and float out
with the flue gas stream As the fused material rises it is transported to low temperature zones
7
allow it cools and then it solidifies as spherical particles of glass which are called fly ash This
fly ash is collected from the flue gas stream by mechanical separators electrostatic
precipitation or bag filters (Nawy 2008) Fly ash can be categorised into two different types
which are Class C and Class F (ASTM C 618-78) Class C ash is consists of high-calcium fly
ashes with carbon content less than 2 while Class F ash contains low-calcium fly ashes
with carbon content less than 5 but sometimes as high as 10 Class C ash is usually
obtained from burning sub-bituminous or lignite coals whereas Class F ashes are obtained
from burning bituminous or anthracite coals The chemical and physical properties of the ash
have significant impact on the performance properties between Class F and C ashes The
physical properties of fly ashes are depending to the source Fly ash is a fine-grained material
which contains spherical glassy particles The particles can be irregular or angular shapes and
its size is depending on the sources The particles of fly ash may be finer or coarser than
Portland cement particles On the other hand the mineralogical properties of fly ash are
significant influenced by both the type and source of fly ash Fly ash contains noncrystalline
particles or glass and a small quantity of crystalline material as result from the rapid cooling
ofburned coal in the power plant
232 Blast-Furnace Slag
Blast-furnace slag is a by-product of the production of iron (Nawy 2008) When it is quickly
cool down with water to glassy state and finely ground thus the property of latent
hydraulicity will be developed (Nawy 2008) Nowadays the use of blast-furnace slag as an
admixture in concrete is well established In the early 1970s glassy slag was produced by
using pelletizing process which uses much less water than granulation methods Firstly a
treatment with water sprays is used to expand the molten slag and then passed over a rotating
8
fInned drum Lastly the semi molten material is cooled and pelletized by throwing them into
the air
233 SUtea Fume
Silica fume is a byproduct of the production of metallic silicon or ferrosilicon alloys which is
produced by electric arc furnaces (Nawy 2008) The two main components such as the types
of alloy fonned and the composition of quartz and coal are commonly used in the electric arc
furnaces which are significantly influence the chemical composition of silica fume The
majority ofpublished data indicates that the utilization of silica fume in concrete must contain
at least 75 ferro silicon
234 Rice Husk Ash
Rice husk ash is a by-product of the agricultural industry which is produced from burning a
mixture of rice husk and eucalyptus bark by fluidized bed combustion process in a biomass
power plant It consists of high amount of Si02 Silica content in the ash increases with higher
the burning temperature Many researches described that rice husk ash consists of high
reactivity and pozzolanic property after burning process at controlled temperature Chemical
composition of rice husk ash is greatly influenced by the temperature during burning
processes
24 The PbysieaJ Properties of POFA
According to AbdullaH et al (2006) the burning temperature condition is one of factors that
significantly influence the physical properties of POFA Several of physical properties of
9
Wlground and ground POF A used in various studies are shown in Table 21 These all
properties ofunground and ground POFA are briefly discussed below
Table 21 Physical properties of unground and ground POF A (Safiuddin et al 2011)
Properties OPC Unground POFA Ground PO FA
Color Grey Light greywhitish Dark grey
Specific gravity 314-328 178-197 222-278
Median particle size dso(urn) 10-20 543-183 72-101
Passing through 45-urn sieve 56-588 97-99
( mass)
Specific surface area Blaine 314-358 796 882-1244
(m2kg)
Strength activity index () 786-115
SOWldness Le Chatelier 045-1 05-26
expansion (mm)
141 Color
UngroWld POF A is usually in light grey color as results from the unburnt carbon content left
at relatively low burning temperature The content of unburnt carbon becomes very low when
the burning temperature is high Besides that unground POF A can also be whitish color in the
absence of unburnt carbon (Abdullah et al 2006) On the other hand ground POF A is dark
grey color
10
141 Specific Gravity
The specific gravity of unground POFA is normally varies in the range of 178-197 From
Table 21 above it can be seen that the specific gravity of unground POF A is about 40
lower than the specific gravity of ope (Tay 1990) However the specific gravity of POF A is
increased and it is about in the range of 222-278 after the grinding process (Sata et al 2004
Tangchirapat et al 2009) It is because the particle size of POF A is reduced and then the
porosity also decreased as results from grinding processes
143 Particle Shape and Size
The particle shape and size of unground POF A is different as compare to ground POF A It
was found that the particle shape and size are mostly large spherical and porous as shown in
Figure 22 In contrast ground POF A is quite similar to Portland cement which crushed
particle is usually in irregular and angular shape as shown in Figure 21 amp 23 ( Chindaprasirt
et al 2007) The particle size of unground POFA is larger than OPC however the particle
size of ground POF A is smaller than OPe The typical particle size distributions of unground
and ground POF A and ope are shown in Figure 24 The median particle size of unground
POFA is about 543)lm -183)lm which is larger than ope which is in the range of I011m -20
1Jlll However the particle size of POFA is decreased to 72)lffi -lO1)lm after grinding
processes (Sata et al 2004 Chindaprasit et at 2008)
11
Figure 21 OPC (Chindaprasirt et ai 2007) Figure 22 Unground POFA (Jaturapitakkul
et ai 2007)
Figure 23 Ground POFA (Jaturapitakkul et ai 2007)
100 r==III~~iITinTI-1M-7I1
II
rriTiT11 Ground POFA JIl jill
90 ope mill J UOOUnd POFA t++tt+-l~I11H80 III IIT~+IIiI--+++IH
70 ~~t+~~UU~~~I IIIV-J~~U oo ~~U~~~Hm+M~~~I~~~
50 +-+tttlitl t-+-Ii+Itflt-+f+TMIlH-i++IHIt-I+tt+Ilt-i~ 1JlIIlt~ 40 +-r-lliM-=-+WII--l-+4R-++I r-H+fllf-++I I N+-i
~ ~~~I~~~~~J~Ir+~ 2o ~~~~~~~~~~~~~~~I I10 ~~~~~~A~~~_I_I~~~ o 1 w
001 01 10 00 1000 10000
Particle size (~m)
Figure 24 Particle size distribution of un ground and ground POFA and OPC (Sata et ai
2004)
12
I
I declare that Projectflhesis is classified as (Please tick (--raquo
D CONFIDENTIAL (Contains confidential information under the Official Secret Act 1972) DRESTRICTED (Contains restricted information as specified by the organisation where
research was done) QJ OPEN ACCESS
Validation of ProjectThesis
I therefore duly affirmed with free consent and willingness declare that this said Projectflhesis shall be placed officially in the Centre for Academic Information Services with the abiding interest and rights as follows
bull This ProjectThesis is the sole legal property of Universiti Malaysia Sarawak (UNIMAS) bull The Centre for Academic Information Services has the lawful right to make copies for the
purpose of academic and research only and not for other purpose bull The Centre for Academic Information Services has the lawful right to digitalise the
content for the Local Content Database bull The_Centre for Academic Information Services has the lawful right to make copies of the
Projectflhesis for academic exchange between Higher Learning Institute bull No dispute or any claim shall arise from the student itself neither third party on this
ProjectThesis once it becomes the sole property of UNIMAS bull This ProjectThesis or any material data and information related to it shall not be
distributed published or disclosed to any party by the student except with UNIMAS permission
rp~ckt middot~ Student signature ________~~ Supervisor signature _______
(28 AUG 2014) (28 AUG 2014)
Current Address 12E JALAN TEMEDAK 96000 SIBU SARA W AK MALAYSIA
Notes If the ProjectThesis is CONFIDENTIAL or RESTRICTED please attach together as annexure a letter from the organisation with the period and reasons of confidentiality and restriction
[The instrument is duly prepared by The Centre for Academic Information Services]
iii
--------------------------~---------~ -~---
L
ACKNOWLEDGEMENTS
First of all I would like to thank my supervisor Dr Delsye Teo Ching Lee for guiding and
assisting me throughout the entire research proj ect Besides that I would also like to thank
everyone who had contributed in conducting the various laboratory experimental tests In
addition I would also like to express my thanks to Serian Palm Oil Mill Sdn Bhd for
providing the palm oil fuel ash (PO FA) resources for my research project Moreover I would
like to thank my family for the support
iv
ABSTRACT
(palm oil industry in Malaysia is well known as the most important agricultural industry
Million tonnes of palm oil fuel ash (POF A) is being generated every year without any
profitable return POF A has the potential to be used as recycle materials due to their
pozzolanic behaviour Thus this research project presents the effect of palm oil fuel ash
(POFA) on the mechanical properties of concrete In this research project POF A was used as
supplementary cementing material to replace cement in concrete production This is because
POF A contains siliceous composition which produces a stronger and denser concrete Three
different fineness of POFA (passing through 38jUll 63jUll and 75jUll) were used to replace
ordinary portland cement at 15 by weight of cement throughout this research project In the
mix proportion a mix design ratio of 1 115295 (Cement Fine Aggregate Coarse Aggregate)
in term of weight of the components was constant for all mixtures In this research project
three laboratory experimentai tests were carried out namely slump test compressive strength
test and splitting tensile strength test The strength of POF A concrete are tested and
determined at 3 7 and 28 days Workability in terms of slump and strength properties of
POF A concrete were studied and compared with control specimen as well The study revealed
that POF A fmeness had significant effect on the workability and strength of concrete The test
results indicated th~ higher slump with higher fineness than those with lower fineness
Compressive strength and splitting tensile strength was found to increase with the increase of
POFA fineness Consequently it was found that POFA concrete produces lower strength than
OPC concrete
v
ABSTRAK
Industri minyak sawit di Malaysia terkenal sebagai industri pertanian yang paling penting
Juta tan abu bahan api kelapa sawit (POF A) sedang dijana setiap tahun tanpa apa-apa
pulangan yang menguntungkan POF A mempunyai potensi untuk digunakan sebagai bahan
kitar semula kerana tingkah laku pozzolanic mereka Oleh itu projek penyelidikan ini
memberikan kesan abu bahan api kelapa sawit (POF A) terhadap sifat mekanikal konkrit
Dalam projek kajian ini POF A telah digunakan sebagai bahan penyimenan tambahan untuk
menggantikan simen dalam konkrit Ini kerana POF A mengandungi komposisi bersilika yang
menghasilkan konkrit yang lebih kukuh dan lebih padat Tiga kehalusan POF A yang
berlainan (melalui 38 ~m 63lfl1 dan 75 1~m) telah digunakan untuk menggantikan simen
portland biasa pada 15 mengikut berat simen sepanjang projek penyelidikan ini Dalam
nisbah campuran nisbah reka bentuk campuran 1 115 295 (Cement Agregat Halus
Agregat Kasar) dari segi berat komponen adalah malar bagi semua campuran Dalam projek
penyelidikan ini tiga ujian ujikaji makmal yang telah dijalankan iaitu ujian kemerosotan
ujian kekuatan mampatan dan membelah ujian kekuatan tegangan Kekuatan konkrit POF A
diuji dan ditentukan pada 3 7 dan 28 hari Kebolehkerjaan dari segi kemerosotan kekuatan
dan sifat-sifat konkrit POF A telah dikaji dan dibandingkan dengan spesimen kawalan juga
Kajian ini mendedahkan bahawa POF A kehalusan mempunyai kesan yang besar ke atas kebolehkerjaan dan kekuatan konkrit Keputusan ujian menunjukkan kemerosotan yang lebih
tinggi dengan kehalusan yang lebih tinggi daripada yang dengan kehalusan yang lebih rendah
Kekuatan mampatan dan kekuatan tegangan membelah didapati meningkat dengan
peningkatan kehalusan POF A Oleh itu didapati bahawa POF A konkrit menghasilkan
kekuatan lebih rendah berbanding konkrit OPe
vi
Pusat Khidmat MakJumat Akademj) UlI1VERSITI MALAYSIA SARAW
TABLE OF CONTENTS
DECLARATION II II II II II bullbull II bullbullbull II II II II bullbullbullbullbullbullbullbull II bullbull II bullbull II II II II bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull II II II II II II II bullbullbullbullbullbullbullbullbullbullbullbull II bullbullbullbullbullbullbullbull U
ACKllOWLEDGEMENTI ivII II II bullbull II II II II II II II II II bullbullbullbullbull II bullbullbullbull II II II II II II II bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull II II II II II II bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull II bullbullbullbull
ABSTRACT II bullbullbullbullbull II bullbullbullbullbullbullbullbullbullbullbull II II II II bullbull II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II bullbull V
TABLE OF CONTENTS II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II bullbullbullbullbullbullbull vii
LIST OF TABLES XII II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II bullbullbullbullbullbullbull
LIST OF FIGURES xiII II II II II II II bullbullbullbullbullbullbullbullbullbullbullbullbull II II II II II II II II II II bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull
LIST OF APPENDICES xii
CHAPTER 1 INTRODUCTION
11 Introduction 1
12 Problem Statement 2
13 Research Significance bull 3
14 Aim and Objectives 3
15 Scope of Work 3
16 Thesis of organisation 4
CHAPTER 2 LITERA TURE REVIEW
21 Introdu~tion 6
22 Admixture 6
23 Types of Mineral Admixture (by-product material)
231 Fly ash 7
232 Blast-furnace slag 8
233 Silica Fume 9
vii
234 Rice Husk ash 9
24 The Physical Properties of POF A
241 Color 10
242 Specific gravity 11
243 Particle shape and size 11
244 Fineness 13
25 The Chemical Properties of PO FA 13
26 Effect of PO FA on the Fresh Properties of Concrete
261 Workability 14
27 Effect of PO FA on the Hardened Properties of Concrete
271 Compressive Strength 15
272 Splitting Tensile Strenampth 17
28 Effect of fineness on the Hardened Properties of concrete 18
29 Concluding Remarks 19
CHAPTER 3 METHODOLOGY
31 General 20
32 Material Properties Tests 20
33 Materials Used for Research Project
331 Palm Oil Fuel Ash (POFA) 21
332 Ordinary Portland Cement (OPC) 23
333 Fine Aggregate 23
viii
334 Coarse Aggregate 24
335 Water 25
34 Concrete Mix Proportions
341 Concrete Mixing 26
342 Concrete Casting 27
343 Concrete Curing 27
35 Fresh Concrete Test
351 Slump Test 27
36 Hardened Concrete Tests
361 Compressive Strength Test 27
362 Splitting Tensile Strength Test 28
CHAPTER 4 RESULTS AND DISCUSSION
41 Introduction 29
42 The Effects of PO FA Fineness on Workability of Concrete 29
43 The Effects of PO FA fmeness on Compressive Strength of Concrete 30
44 The Effects of POF A Fineness on Splitting Tensile Strength of Concre 34
CHAPTER 5 CONCLUSIONS AND RECOMMENDA nONS
51 Conclusions 38
52 Recommendations 39
REFERENCES 41
APPENDICES ~ 45
ix
LIST OF TABLES
Table 21 Physical properties ofunground and ground POFA (Safiuddin et aI 2011) 10
Table 22 Chemical composition ofOPC and PO FA (Source Awal 1997 Tangchirapat
Table 23 Effect of POF A on the workability of concrete (Eldagal 2008 Sata et aI 2007
2007 Eldagal 2008) 14
Tay1990) 15
Table 31 Aggregates Properties Laboratory Tests 21
Table 32 Chemical composition of OPC ASTM Type 1 23
Table 33 Physical properties of fine aggregate 23
Table 34 Physical properties of coarse aggregate 24
Table 35 Mix Proportion 26
Table 41 Slump 29
Table 42 Compressive strength for 3 7 and 28 days 31
Table 43 Splitting tensile strength for 3 7 and 28 days 35
x
LIST OF FIGURES
Figure 21 OPC (Chindaprasirt et aI 2007) 12
Figure 24 Particle size distribution ofunground and ground POFA and OPC (Sata et aI
Figure 25 Effect ofunground POFA on the compressive strength of concrete at 28 days (Tay
Figure 26 Effect of ground POF A on the compressive strength at different test ages
Figure 27 Effect of ground POFA on the splitting tensile strength of concrete (Sata et aI
Figure 22 Unground POF A (Jaturapitakkul et aI 2007) 12
Fjgure 23 Ground POFA Jaturapitakkul et aI 2007) 12
2004) 12
1990) 17
(Tangchirapat et aI 2009) 17
2007) 18
Figure 31 POFA 22
Figure 32 Sieved POFA 22
Figure 33 Sieve analysis for sand 24
Figure 34 Sieve analysis for coarse aggregate 25
Figure 41 The Slump 30
Figure 42 Compressive Strength for 3 7 and 28 days 33
Figure 43 Splitting Tensile Strength for 3 7 and 28 days 37
LIST OF APPENDICES
APPENDIX A Processes of Specific Gravity of Coarse Aggregate 45
APPENDIX B Processes of Specific Gravity of Fine Aggreagte 46
APPENDIX C Processes of Concrete Mixing Casting and Curing 48
APPENDIX D Processes of Slump Test 50
APPENDIX E Processes of Compressive Strength Test 51
APPENDIX F Processes of Splitting Tensile Strength Test 52
xii
CHAPTER 1
INTRODUCTION
11 Introduction
Concrete is usually a composite material that is used in civil engineering construction work It
is typically a mixture of cement water aggregate and also other admixtures Concrete is
strong in compression because the aggregate has the ability to carry the compression load
however it is extremely weak in tension
Cement consists of adhesive and cohesive properties which enable it to bond mineral
fragments into a solid mass Cement contains silicates and aluminates of lime which are made
from blended and ground limestone and clay According to Dobrowolski (1998) portland
cement is the most commonly used hydraulic ~ement for making concrete around the world It
is considered as the most significant component of hydraulic cement which hardens due to
hydration a chemical reaction between cement powder and water In concrete design and
quality control strength is the property usually specified The water-cementitious materials
ratio the extent of hydration the curing and environmental conditions are the main factors
that influence the strength of concrete The ultimate compressive strength and rate of strength
development of concrete are also greatly dependent on the chemical and physical properties of
the cement
Higher demands for construction works have contributed to augmentation of cement
production as one of the main components of concrete manufacture As a result the
production of cement leads to increase the concern of global warming as CO2 emission is
released to atmosphere However the variety of studies about various supplementary
1
cementing material involved in concrete production has been conducted in recent years
Nowadays the use of various supplementary cementing materials such as Fly Ash Blastshy
Furnace Slag Silica Fume Rice husk Ash and other fiber and pozzolanic material are gaining
popularity due to increasingly stringent environmental legislation In addition the use of
various supplementary cementing materials is also a common practice since they are
significantly reducing the cement content and improve the ultimate strength of the concrete
In this study the study about the use of Palm Oil Fuel Ash (POF A) as a supplementary
cementing material in concrete production is carried out The influence of POF A and its
degree of fmeness on the mechanical properties of concrete is investigated In Malaysia palm
oil industry is considered as the most important agro industries POF A is a by-product which
is generated from the combustion of palm oil plant residues In this study POF A is used as a
pozzolanic material and also a replacement of cement in concrete to produce cementitious
properties Pozzolan is defined as a siliceous or siliceous and aluminous material where the
particles react with calcium hydroxide from the cement to produce cementitious properties
The utilization of pozzolanic material in concrete would reduce the negative environmental
effect and landfill volume for the disposal of wastes
12 Problem Statement
The presence of palm oil wastes has created a major disposal problem due to a large amount
of solid waste materials is produced such as palm fiber nutshells and empty fruit bunches
from palm oil industry which is burnt at temperatures of about 800-1000 degC as fuels to
provide steam for electricity generation in palm oil mills After the burning process an ash
by-product are obtained which is about 5 by weight of the residues known as palm oil fuel
ash (pOF A) It has been reported that around 4 million tonsyears of POF A are produced in
2
Malaysia only (Zarina 2012) While the quantity of PO FA is rising annually its utilization is
limited and basically disposed of as a waste in landfills without any profitable return It can
also affect environmental problems such as health hazards and financial loss
13 Research Significance
There are several significances in this research project Firstly PDFA is incorporated as
supplementary cementing material in the concrete mix as to promote the use of agricultural
waste and create a more sustainable environment besides its own ability to improve strength
development of concrete Next it is also important that to obtain a mix proportion to produce
concrete incorporated with PDFA and studies the mechanical properties of concrete in term of
compressive strength and splitting tensile strength
14 Aim and Objectives
The aim of this research project is to conduct an experimental testing program to determine
the effects of PDFA fineness on the mechanical properties of concrete The objectives of the
research project are
1 To obtain a mix proportion containing different PDFA fineness which can achieve a
targeted strength of 30 Nmm2 at 28 days and slump of 60mm-180mm
II To study the mechanical properties of concr~te by using POFA with 3 different
fineness which are passing through 38wn 631m and 751m
1S Scope of work
The study focuses on the effect of PDFA fineness on the mechanical properties of concrete
The study only limited to test for three types of PDFA fineness which are 381m 631ffi and
3
75JlM with 15 PDFA replacement Three laboratories experimental tests is carried out
namely slump test compressive strength test and splitting tensile strength test The slump test
is carried out to detennine the workability of fresh concrete The concrete sample is cured in
the water and tested for 3 days 7 days and 28 days strength Consequently two mechanical
properties of concrete such as compressive strength and splitting tensile strength will be tested
in this study
16 Thesis Organisation
This report contains five chapters which are introduction literature review methodology
result and discussion and conclusion respectively
Chapter I discuss the general background of the research problem statement scope of work
aim and objectives and thesis significance
Chapter 2 discuss the admixture which is also one of the components of concrete mix Besides
that a general background for four types of pozzolanic materials such as fly ash blast furnace
slag silica fume and rice husk ash will be discussed in this chapter In addition the properties
of PDF A such as physical and chemical composition will also be discussed in this chapter
Moreover a previous study about the effect of PDF A on the mechanical properties of
concrete will be studied Lastly a previous research about the effect of fineness on properties
ofconcrete will be also discussed
Chapter 3 explain various laboratory tests will be carried out in this chapter In this chapter
three laboratory experiments will be conducted such as slump test compressive strength test
and splitting tensile strength test In addition experiment setups will be stated in this chapter
4
r-~-------~-----p~rKhldmat Mak1umat Akauemillt UNIVERSrn MALAYSIA SAltAWAIlt
Chapter 4 generally presents and discusses about the result of each laboratory tests that
conducted in tenn of compressive strength and splitting tensile strength
Chapter 5 conclude the whole study has been conducted A conclusion has been drawn with
relevant objectives stated based on the result achieved from this study Besides that there are
few recommendations will be listed in this chapter
5
CHAPTER 2
LITERATURE REVIEW
21 Introduction
During recent decades there are many researchers have been carried out for the use of
admixture in concrete mixture such as fly ash blast-furnace slag silica fume rice husk ash
and also palm oil fuel ash Besides that the properties of POF A are also briefly discussed and
previous study about the effects of POF A on the mechanical properties of concrete are also
reviewed Lastly previous study about the effects of fineness on the properties of concrete are
also reviewed
22 Admixture
Admixture is used as an additional material which is added to concrete mixtures It is varying
widely in chemical composition from surfactants and soluble salts to polymers and insoluble
minerals The properties of concrete such as workability strength and durability can be
improved by adding admixtures to concrete batch (Monte rio amp Mehta 2006) Besides that
the use of admixture in concrete mixtures may also increase or decrease the cost of concrete
by lowering the required cement content changing the volume of the concrete mixture or
reducing the cost of concrete placing and finishing Thus admixture plays an important role
in concrete mixtures Admixture can be categorised into 2 categorise which is mineral
admixture (fly ash silica fume and others) and chemical admixture (air-entering agents
accelerators water-reducing admixtures However mineral admixtures are more emphasized
in this study and used as supplementary cementitious material for producing concrete
6
Mineral admixtures are categorised into 2 classifications which are natural materials and byshy
product materials Some mineral admixtures can be pozzolanic cementitious and however
others are both cementitious and pozzolanic (Monterio amp Mehta 2006) Natural materials are
defined as a material that has been treated for the only purpose of making a pozzolan
Generally the process involves crushing grinding and size separation occasionally it may
also include thermal activation On the other hand by-product materials are defined as a
material that is not the primary products which produced from industry It mayor may not
require any processing before use as mineral admixtures
However by-product materials are more highlighted in this study Consequently the physiGal
and chemical and mineralogical properties of palm oil fuel ash (PDF A) will be further
discussed in this study Besides that effect of PDF A on the mechanical properties of concrete
will be also discussed in this study
23 Types of Mineral Admixtures from By-product
A variety of by-product materials such as fly ash blast-furnace slag silica fume rice husk ash
and others have been commonly used as pozzolanic materials in concrete The utilization of
pozzolanic material not only enhances the properties of concrete but also protects the
environment
231 Fly Ash
According to Day (2006) fly ash is also known as pulverized fuel ash which is produced from
the combustion of coal in thermal power plants During combustion the mineral impurities
such as clays quartz and feldspar melt in suspension at the high temperature and float out
with the flue gas stream As the fused material rises it is transported to low temperature zones
7
allow it cools and then it solidifies as spherical particles of glass which are called fly ash This
fly ash is collected from the flue gas stream by mechanical separators electrostatic
precipitation or bag filters (Nawy 2008) Fly ash can be categorised into two different types
which are Class C and Class F (ASTM C 618-78) Class C ash is consists of high-calcium fly
ashes with carbon content less than 2 while Class F ash contains low-calcium fly ashes
with carbon content less than 5 but sometimes as high as 10 Class C ash is usually
obtained from burning sub-bituminous or lignite coals whereas Class F ashes are obtained
from burning bituminous or anthracite coals The chemical and physical properties of the ash
have significant impact on the performance properties between Class F and C ashes The
physical properties of fly ashes are depending to the source Fly ash is a fine-grained material
which contains spherical glassy particles The particles can be irregular or angular shapes and
its size is depending on the sources The particles of fly ash may be finer or coarser than
Portland cement particles On the other hand the mineralogical properties of fly ash are
significant influenced by both the type and source of fly ash Fly ash contains noncrystalline
particles or glass and a small quantity of crystalline material as result from the rapid cooling
ofburned coal in the power plant
232 Blast-Furnace Slag
Blast-furnace slag is a by-product of the production of iron (Nawy 2008) When it is quickly
cool down with water to glassy state and finely ground thus the property of latent
hydraulicity will be developed (Nawy 2008) Nowadays the use of blast-furnace slag as an
admixture in concrete is well established In the early 1970s glassy slag was produced by
using pelletizing process which uses much less water than granulation methods Firstly a
treatment with water sprays is used to expand the molten slag and then passed over a rotating
8
fInned drum Lastly the semi molten material is cooled and pelletized by throwing them into
the air
233 SUtea Fume
Silica fume is a byproduct of the production of metallic silicon or ferrosilicon alloys which is
produced by electric arc furnaces (Nawy 2008) The two main components such as the types
of alloy fonned and the composition of quartz and coal are commonly used in the electric arc
furnaces which are significantly influence the chemical composition of silica fume The
majority ofpublished data indicates that the utilization of silica fume in concrete must contain
at least 75 ferro silicon
234 Rice Husk Ash
Rice husk ash is a by-product of the agricultural industry which is produced from burning a
mixture of rice husk and eucalyptus bark by fluidized bed combustion process in a biomass
power plant It consists of high amount of Si02 Silica content in the ash increases with higher
the burning temperature Many researches described that rice husk ash consists of high
reactivity and pozzolanic property after burning process at controlled temperature Chemical
composition of rice husk ash is greatly influenced by the temperature during burning
processes
24 The PbysieaJ Properties of POFA
According to AbdullaH et al (2006) the burning temperature condition is one of factors that
significantly influence the physical properties of POFA Several of physical properties of
9
Wlground and ground POF A used in various studies are shown in Table 21 These all
properties ofunground and ground POFA are briefly discussed below
Table 21 Physical properties of unground and ground POF A (Safiuddin et al 2011)
Properties OPC Unground POFA Ground PO FA
Color Grey Light greywhitish Dark grey
Specific gravity 314-328 178-197 222-278
Median particle size dso(urn) 10-20 543-183 72-101
Passing through 45-urn sieve 56-588 97-99
( mass)
Specific surface area Blaine 314-358 796 882-1244
(m2kg)
Strength activity index () 786-115
SOWldness Le Chatelier 045-1 05-26
expansion (mm)
141 Color
UngroWld POF A is usually in light grey color as results from the unburnt carbon content left
at relatively low burning temperature The content of unburnt carbon becomes very low when
the burning temperature is high Besides that unground POF A can also be whitish color in the
absence of unburnt carbon (Abdullah et al 2006) On the other hand ground POF A is dark
grey color
10
141 Specific Gravity
The specific gravity of unground POFA is normally varies in the range of 178-197 From
Table 21 above it can be seen that the specific gravity of unground POF A is about 40
lower than the specific gravity of ope (Tay 1990) However the specific gravity of POF A is
increased and it is about in the range of 222-278 after the grinding process (Sata et al 2004
Tangchirapat et al 2009) It is because the particle size of POF A is reduced and then the
porosity also decreased as results from grinding processes
143 Particle Shape and Size
The particle shape and size of unground POF A is different as compare to ground POF A It
was found that the particle shape and size are mostly large spherical and porous as shown in
Figure 22 In contrast ground POF A is quite similar to Portland cement which crushed
particle is usually in irregular and angular shape as shown in Figure 21 amp 23 ( Chindaprasirt
et al 2007) The particle size of unground POFA is larger than OPC however the particle
size of ground POF A is smaller than OPe The typical particle size distributions of unground
and ground POF A and ope are shown in Figure 24 The median particle size of unground
POFA is about 543)lm -183)lm which is larger than ope which is in the range of I011m -20
1Jlll However the particle size of POFA is decreased to 72)lffi -lO1)lm after grinding
processes (Sata et al 2004 Chindaprasit et at 2008)
11
Figure 21 OPC (Chindaprasirt et ai 2007) Figure 22 Unground POFA (Jaturapitakkul
et ai 2007)
Figure 23 Ground POFA (Jaturapitakkul et ai 2007)
100 r==III~~iITinTI-1M-7I1
II
rriTiT11 Ground POFA JIl jill
90 ope mill J UOOUnd POFA t++tt+-l~I11H80 III IIT~+IIiI--+++IH
70 ~~t+~~UU~~~I IIIV-J~~U oo ~~U~~~Hm+M~~~I~~~
50 +-+tttlitl t-+-Ii+Itflt-+f+TMIlH-i++IHIt-I+tt+Ilt-i~ 1JlIIlt~ 40 +-r-lliM-=-+WII--l-+4R-++I r-H+fllf-++I I N+-i
~ ~~~I~~~~~J~Ir+~ 2o ~~~~~~~~~~~~~~~I I10 ~~~~~~A~~~_I_I~~~ o 1 w
001 01 10 00 1000 10000
Particle size (~m)
Figure 24 Particle size distribution of un ground and ground POFA and OPC (Sata et ai
2004)
12
ACKNOWLEDGEMENTS
First of all I would like to thank my supervisor Dr Delsye Teo Ching Lee for guiding and
assisting me throughout the entire research proj ect Besides that I would also like to thank
everyone who had contributed in conducting the various laboratory experimental tests In
addition I would also like to express my thanks to Serian Palm Oil Mill Sdn Bhd for
providing the palm oil fuel ash (PO FA) resources for my research project Moreover I would
like to thank my family for the support
iv
ABSTRACT
(palm oil industry in Malaysia is well known as the most important agricultural industry
Million tonnes of palm oil fuel ash (POF A) is being generated every year without any
profitable return POF A has the potential to be used as recycle materials due to their
pozzolanic behaviour Thus this research project presents the effect of palm oil fuel ash
(POFA) on the mechanical properties of concrete In this research project POF A was used as
supplementary cementing material to replace cement in concrete production This is because
POF A contains siliceous composition which produces a stronger and denser concrete Three
different fineness of POFA (passing through 38jUll 63jUll and 75jUll) were used to replace
ordinary portland cement at 15 by weight of cement throughout this research project In the
mix proportion a mix design ratio of 1 115295 (Cement Fine Aggregate Coarse Aggregate)
in term of weight of the components was constant for all mixtures In this research project
three laboratory experimentai tests were carried out namely slump test compressive strength
test and splitting tensile strength test The strength of POF A concrete are tested and
determined at 3 7 and 28 days Workability in terms of slump and strength properties of
POF A concrete were studied and compared with control specimen as well The study revealed
that POF A fmeness had significant effect on the workability and strength of concrete The test
results indicated th~ higher slump with higher fineness than those with lower fineness
Compressive strength and splitting tensile strength was found to increase with the increase of
POFA fineness Consequently it was found that POFA concrete produces lower strength than
OPC concrete
v
ABSTRAK
Industri minyak sawit di Malaysia terkenal sebagai industri pertanian yang paling penting
Juta tan abu bahan api kelapa sawit (POF A) sedang dijana setiap tahun tanpa apa-apa
pulangan yang menguntungkan POF A mempunyai potensi untuk digunakan sebagai bahan
kitar semula kerana tingkah laku pozzolanic mereka Oleh itu projek penyelidikan ini
memberikan kesan abu bahan api kelapa sawit (POF A) terhadap sifat mekanikal konkrit
Dalam projek kajian ini POF A telah digunakan sebagai bahan penyimenan tambahan untuk
menggantikan simen dalam konkrit Ini kerana POF A mengandungi komposisi bersilika yang
menghasilkan konkrit yang lebih kukuh dan lebih padat Tiga kehalusan POF A yang
berlainan (melalui 38 ~m 63lfl1 dan 75 1~m) telah digunakan untuk menggantikan simen
portland biasa pada 15 mengikut berat simen sepanjang projek penyelidikan ini Dalam
nisbah campuran nisbah reka bentuk campuran 1 115 295 (Cement Agregat Halus
Agregat Kasar) dari segi berat komponen adalah malar bagi semua campuran Dalam projek
penyelidikan ini tiga ujian ujikaji makmal yang telah dijalankan iaitu ujian kemerosotan
ujian kekuatan mampatan dan membelah ujian kekuatan tegangan Kekuatan konkrit POF A
diuji dan ditentukan pada 3 7 dan 28 hari Kebolehkerjaan dari segi kemerosotan kekuatan
dan sifat-sifat konkrit POF A telah dikaji dan dibandingkan dengan spesimen kawalan juga
Kajian ini mendedahkan bahawa POF A kehalusan mempunyai kesan yang besar ke atas kebolehkerjaan dan kekuatan konkrit Keputusan ujian menunjukkan kemerosotan yang lebih
tinggi dengan kehalusan yang lebih tinggi daripada yang dengan kehalusan yang lebih rendah
Kekuatan mampatan dan kekuatan tegangan membelah didapati meningkat dengan
peningkatan kehalusan POF A Oleh itu didapati bahawa POF A konkrit menghasilkan
kekuatan lebih rendah berbanding konkrit OPe
vi
Pusat Khidmat MakJumat Akademj) UlI1VERSITI MALAYSIA SARAW
TABLE OF CONTENTS
DECLARATION II II II II II bullbull II bullbullbull II II II II bullbullbullbullbullbullbullbull II bullbull II bullbull II II II II bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull II II II II II II II bullbullbullbullbullbullbullbullbullbullbullbull II bullbullbullbullbullbullbullbull U
ACKllOWLEDGEMENTI ivII II II bullbull II II II II II II II II II bullbullbullbullbull II bullbullbullbull II II II II II II II bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull II II II II II II bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull II bullbullbullbull
ABSTRACT II bullbullbullbullbull II bullbullbullbullbullbullbullbullbullbullbull II II II II bullbull II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II bullbull V
TABLE OF CONTENTS II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II bullbullbullbullbullbullbull vii
LIST OF TABLES XII II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II bullbullbullbullbullbullbull
LIST OF FIGURES xiII II II II II II II bullbullbullbullbullbullbullbullbullbullbullbullbull II II II II II II II II II II bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull
LIST OF APPENDICES xii
CHAPTER 1 INTRODUCTION
11 Introduction 1
12 Problem Statement 2
13 Research Significance bull 3
14 Aim and Objectives 3
15 Scope of Work 3
16 Thesis of organisation 4
CHAPTER 2 LITERA TURE REVIEW
21 Introdu~tion 6
22 Admixture 6
23 Types of Mineral Admixture (by-product material)
231 Fly ash 7
232 Blast-furnace slag 8
233 Silica Fume 9
vii
234 Rice Husk ash 9
24 The Physical Properties of POF A
241 Color 10
242 Specific gravity 11
243 Particle shape and size 11
244 Fineness 13
25 The Chemical Properties of PO FA 13
26 Effect of PO FA on the Fresh Properties of Concrete
261 Workability 14
27 Effect of PO FA on the Hardened Properties of Concrete
271 Compressive Strength 15
272 Splitting Tensile Strenampth 17
28 Effect of fineness on the Hardened Properties of concrete 18
29 Concluding Remarks 19
CHAPTER 3 METHODOLOGY
31 General 20
32 Material Properties Tests 20
33 Materials Used for Research Project
331 Palm Oil Fuel Ash (POFA) 21
332 Ordinary Portland Cement (OPC) 23
333 Fine Aggregate 23
viii
334 Coarse Aggregate 24
335 Water 25
34 Concrete Mix Proportions
341 Concrete Mixing 26
342 Concrete Casting 27
343 Concrete Curing 27
35 Fresh Concrete Test
351 Slump Test 27
36 Hardened Concrete Tests
361 Compressive Strength Test 27
362 Splitting Tensile Strength Test 28
CHAPTER 4 RESULTS AND DISCUSSION
41 Introduction 29
42 The Effects of PO FA Fineness on Workability of Concrete 29
43 The Effects of PO FA fmeness on Compressive Strength of Concrete 30
44 The Effects of POF A Fineness on Splitting Tensile Strength of Concre 34
CHAPTER 5 CONCLUSIONS AND RECOMMENDA nONS
51 Conclusions 38
52 Recommendations 39
REFERENCES 41
APPENDICES ~ 45
ix
LIST OF TABLES
Table 21 Physical properties ofunground and ground POFA (Safiuddin et aI 2011) 10
Table 22 Chemical composition ofOPC and PO FA (Source Awal 1997 Tangchirapat
Table 23 Effect of POF A on the workability of concrete (Eldagal 2008 Sata et aI 2007
2007 Eldagal 2008) 14
Tay1990) 15
Table 31 Aggregates Properties Laboratory Tests 21
Table 32 Chemical composition of OPC ASTM Type 1 23
Table 33 Physical properties of fine aggregate 23
Table 34 Physical properties of coarse aggregate 24
Table 35 Mix Proportion 26
Table 41 Slump 29
Table 42 Compressive strength for 3 7 and 28 days 31
Table 43 Splitting tensile strength for 3 7 and 28 days 35
x
LIST OF FIGURES
Figure 21 OPC (Chindaprasirt et aI 2007) 12
Figure 24 Particle size distribution ofunground and ground POFA and OPC (Sata et aI
Figure 25 Effect ofunground POFA on the compressive strength of concrete at 28 days (Tay
Figure 26 Effect of ground POF A on the compressive strength at different test ages
Figure 27 Effect of ground POFA on the splitting tensile strength of concrete (Sata et aI
Figure 22 Unground POF A (Jaturapitakkul et aI 2007) 12
Fjgure 23 Ground POFA Jaturapitakkul et aI 2007) 12
2004) 12
1990) 17
(Tangchirapat et aI 2009) 17
2007) 18
Figure 31 POFA 22
Figure 32 Sieved POFA 22
Figure 33 Sieve analysis for sand 24
Figure 34 Sieve analysis for coarse aggregate 25
Figure 41 The Slump 30
Figure 42 Compressive Strength for 3 7 and 28 days 33
Figure 43 Splitting Tensile Strength for 3 7 and 28 days 37
LIST OF APPENDICES
APPENDIX A Processes of Specific Gravity of Coarse Aggregate 45
APPENDIX B Processes of Specific Gravity of Fine Aggreagte 46
APPENDIX C Processes of Concrete Mixing Casting and Curing 48
APPENDIX D Processes of Slump Test 50
APPENDIX E Processes of Compressive Strength Test 51
APPENDIX F Processes of Splitting Tensile Strength Test 52
xii
CHAPTER 1
INTRODUCTION
11 Introduction
Concrete is usually a composite material that is used in civil engineering construction work It
is typically a mixture of cement water aggregate and also other admixtures Concrete is
strong in compression because the aggregate has the ability to carry the compression load
however it is extremely weak in tension
Cement consists of adhesive and cohesive properties which enable it to bond mineral
fragments into a solid mass Cement contains silicates and aluminates of lime which are made
from blended and ground limestone and clay According to Dobrowolski (1998) portland
cement is the most commonly used hydraulic ~ement for making concrete around the world It
is considered as the most significant component of hydraulic cement which hardens due to
hydration a chemical reaction between cement powder and water In concrete design and
quality control strength is the property usually specified The water-cementitious materials
ratio the extent of hydration the curing and environmental conditions are the main factors
that influence the strength of concrete The ultimate compressive strength and rate of strength
development of concrete are also greatly dependent on the chemical and physical properties of
the cement
Higher demands for construction works have contributed to augmentation of cement
production as one of the main components of concrete manufacture As a result the
production of cement leads to increase the concern of global warming as CO2 emission is
released to atmosphere However the variety of studies about various supplementary
1
cementing material involved in concrete production has been conducted in recent years
Nowadays the use of various supplementary cementing materials such as Fly Ash Blastshy
Furnace Slag Silica Fume Rice husk Ash and other fiber and pozzolanic material are gaining
popularity due to increasingly stringent environmental legislation In addition the use of
various supplementary cementing materials is also a common practice since they are
significantly reducing the cement content and improve the ultimate strength of the concrete
In this study the study about the use of Palm Oil Fuel Ash (POF A) as a supplementary
cementing material in concrete production is carried out The influence of POF A and its
degree of fmeness on the mechanical properties of concrete is investigated In Malaysia palm
oil industry is considered as the most important agro industries POF A is a by-product which
is generated from the combustion of palm oil plant residues In this study POF A is used as a
pozzolanic material and also a replacement of cement in concrete to produce cementitious
properties Pozzolan is defined as a siliceous or siliceous and aluminous material where the
particles react with calcium hydroxide from the cement to produce cementitious properties
The utilization of pozzolanic material in concrete would reduce the negative environmental
effect and landfill volume for the disposal of wastes
12 Problem Statement
The presence of palm oil wastes has created a major disposal problem due to a large amount
of solid waste materials is produced such as palm fiber nutshells and empty fruit bunches
from palm oil industry which is burnt at temperatures of about 800-1000 degC as fuels to
provide steam for electricity generation in palm oil mills After the burning process an ash
by-product are obtained which is about 5 by weight of the residues known as palm oil fuel
ash (pOF A) It has been reported that around 4 million tonsyears of POF A are produced in
2
Malaysia only (Zarina 2012) While the quantity of PO FA is rising annually its utilization is
limited and basically disposed of as a waste in landfills without any profitable return It can
also affect environmental problems such as health hazards and financial loss
13 Research Significance
There are several significances in this research project Firstly PDFA is incorporated as
supplementary cementing material in the concrete mix as to promote the use of agricultural
waste and create a more sustainable environment besides its own ability to improve strength
development of concrete Next it is also important that to obtain a mix proportion to produce
concrete incorporated with PDFA and studies the mechanical properties of concrete in term of
compressive strength and splitting tensile strength
14 Aim and Objectives
The aim of this research project is to conduct an experimental testing program to determine
the effects of PDFA fineness on the mechanical properties of concrete The objectives of the
research project are
1 To obtain a mix proportion containing different PDFA fineness which can achieve a
targeted strength of 30 Nmm2 at 28 days and slump of 60mm-180mm
II To study the mechanical properties of concr~te by using POFA with 3 different
fineness which are passing through 38wn 631m and 751m
1S Scope of work
The study focuses on the effect of PDFA fineness on the mechanical properties of concrete
The study only limited to test for three types of PDFA fineness which are 381m 631ffi and
3
75JlM with 15 PDFA replacement Three laboratories experimental tests is carried out
namely slump test compressive strength test and splitting tensile strength test The slump test
is carried out to detennine the workability of fresh concrete The concrete sample is cured in
the water and tested for 3 days 7 days and 28 days strength Consequently two mechanical
properties of concrete such as compressive strength and splitting tensile strength will be tested
in this study
16 Thesis Organisation
This report contains five chapters which are introduction literature review methodology
result and discussion and conclusion respectively
Chapter I discuss the general background of the research problem statement scope of work
aim and objectives and thesis significance
Chapter 2 discuss the admixture which is also one of the components of concrete mix Besides
that a general background for four types of pozzolanic materials such as fly ash blast furnace
slag silica fume and rice husk ash will be discussed in this chapter In addition the properties
of PDF A such as physical and chemical composition will also be discussed in this chapter
Moreover a previous study about the effect of PDF A on the mechanical properties of
concrete will be studied Lastly a previous research about the effect of fineness on properties
ofconcrete will be also discussed
Chapter 3 explain various laboratory tests will be carried out in this chapter In this chapter
three laboratory experiments will be conducted such as slump test compressive strength test
and splitting tensile strength test In addition experiment setups will be stated in this chapter
4
r-~-------~-----p~rKhldmat Mak1umat Akauemillt UNIVERSrn MALAYSIA SAltAWAIlt
Chapter 4 generally presents and discusses about the result of each laboratory tests that
conducted in tenn of compressive strength and splitting tensile strength
Chapter 5 conclude the whole study has been conducted A conclusion has been drawn with
relevant objectives stated based on the result achieved from this study Besides that there are
few recommendations will be listed in this chapter
5
CHAPTER 2
LITERATURE REVIEW
21 Introduction
During recent decades there are many researchers have been carried out for the use of
admixture in concrete mixture such as fly ash blast-furnace slag silica fume rice husk ash
and also palm oil fuel ash Besides that the properties of POF A are also briefly discussed and
previous study about the effects of POF A on the mechanical properties of concrete are also
reviewed Lastly previous study about the effects of fineness on the properties of concrete are
also reviewed
22 Admixture
Admixture is used as an additional material which is added to concrete mixtures It is varying
widely in chemical composition from surfactants and soluble salts to polymers and insoluble
minerals The properties of concrete such as workability strength and durability can be
improved by adding admixtures to concrete batch (Monte rio amp Mehta 2006) Besides that
the use of admixture in concrete mixtures may also increase or decrease the cost of concrete
by lowering the required cement content changing the volume of the concrete mixture or
reducing the cost of concrete placing and finishing Thus admixture plays an important role
in concrete mixtures Admixture can be categorised into 2 categorise which is mineral
admixture (fly ash silica fume and others) and chemical admixture (air-entering agents
accelerators water-reducing admixtures However mineral admixtures are more emphasized
in this study and used as supplementary cementitious material for producing concrete
6
Mineral admixtures are categorised into 2 classifications which are natural materials and byshy
product materials Some mineral admixtures can be pozzolanic cementitious and however
others are both cementitious and pozzolanic (Monterio amp Mehta 2006) Natural materials are
defined as a material that has been treated for the only purpose of making a pozzolan
Generally the process involves crushing grinding and size separation occasionally it may
also include thermal activation On the other hand by-product materials are defined as a
material that is not the primary products which produced from industry It mayor may not
require any processing before use as mineral admixtures
However by-product materials are more highlighted in this study Consequently the physiGal
and chemical and mineralogical properties of palm oil fuel ash (PDF A) will be further
discussed in this study Besides that effect of PDF A on the mechanical properties of concrete
will be also discussed in this study
23 Types of Mineral Admixtures from By-product
A variety of by-product materials such as fly ash blast-furnace slag silica fume rice husk ash
and others have been commonly used as pozzolanic materials in concrete The utilization of
pozzolanic material not only enhances the properties of concrete but also protects the
environment
231 Fly Ash
According to Day (2006) fly ash is also known as pulverized fuel ash which is produced from
the combustion of coal in thermal power plants During combustion the mineral impurities
such as clays quartz and feldspar melt in suspension at the high temperature and float out
with the flue gas stream As the fused material rises it is transported to low temperature zones
7
allow it cools and then it solidifies as spherical particles of glass which are called fly ash This
fly ash is collected from the flue gas stream by mechanical separators electrostatic
precipitation or bag filters (Nawy 2008) Fly ash can be categorised into two different types
which are Class C and Class F (ASTM C 618-78) Class C ash is consists of high-calcium fly
ashes with carbon content less than 2 while Class F ash contains low-calcium fly ashes
with carbon content less than 5 but sometimes as high as 10 Class C ash is usually
obtained from burning sub-bituminous or lignite coals whereas Class F ashes are obtained
from burning bituminous or anthracite coals The chemical and physical properties of the ash
have significant impact on the performance properties between Class F and C ashes The
physical properties of fly ashes are depending to the source Fly ash is a fine-grained material
which contains spherical glassy particles The particles can be irregular or angular shapes and
its size is depending on the sources The particles of fly ash may be finer or coarser than
Portland cement particles On the other hand the mineralogical properties of fly ash are
significant influenced by both the type and source of fly ash Fly ash contains noncrystalline
particles or glass and a small quantity of crystalline material as result from the rapid cooling
ofburned coal in the power plant
232 Blast-Furnace Slag
Blast-furnace slag is a by-product of the production of iron (Nawy 2008) When it is quickly
cool down with water to glassy state and finely ground thus the property of latent
hydraulicity will be developed (Nawy 2008) Nowadays the use of blast-furnace slag as an
admixture in concrete is well established In the early 1970s glassy slag was produced by
using pelletizing process which uses much less water than granulation methods Firstly a
treatment with water sprays is used to expand the molten slag and then passed over a rotating
8
fInned drum Lastly the semi molten material is cooled and pelletized by throwing them into
the air
233 SUtea Fume
Silica fume is a byproduct of the production of metallic silicon or ferrosilicon alloys which is
produced by electric arc furnaces (Nawy 2008) The two main components such as the types
of alloy fonned and the composition of quartz and coal are commonly used in the electric arc
furnaces which are significantly influence the chemical composition of silica fume The
majority ofpublished data indicates that the utilization of silica fume in concrete must contain
at least 75 ferro silicon
234 Rice Husk Ash
Rice husk ash is a by-product of the agricultural industry which is produced from burning a
mixture of rice husk and eucalyptus bark by fluidized bed combustion process in a biomass
power plant It consists of high amount of Si02 Silica content in the ash increases with higher
the burning temperature Many researches described that rice husk ash consists of high
reactivity and pozzolanic property after burning process at controlled temperature Chemical
composition of rice husk ash is greatly influenced by the temperature during burning
processes
24 The PbysieaJ Properties of POFA
According to AbdullaH et al (2006) the burning temperature condition is one of factors that
significantly influence the physical properties of POFA Several of physical properties of
9
Wlground and ground POF A used in various studies are shown in Table 21 These all
properties ofunground and ground POFA are briefly discussed below
Table 21 Physical properties of unground and ground POF A (Safiuddin et al 2011)
Properties OPC Unground POFA Ground PO FA
Color Grey Light greywhitish Dark grey
Specific gravity 314-328 178-197 222-278
Median particle size dso(urn) 10-20 543-183 72-101
Passing through 45-urn sieve 56-588 97-99
( mass)
Specific surface area Blaine 314-358 796 882-1244
(m2kg)
Strength activity index () 786-115
SOWldness Le Chatelier 045-1 05-26
expansion (mm)
141 Color
UngroWld POF A is usually in light grey color as results from the unburnt carbon content left
at relatively low burning temperature The content of unburnt carbon becomes very low when
the burning temperature is high Besides that unground POF A can also be whitish color in the
absence of unburnt carbon (Abdullah et al 2006) On the other hand ground POF A is dark
grey color
10
141 Specific Gravity
The specific gravity of unground POFA is normally varies in the range of 178-197 From
Table 21 above it can be seen that the specific gravity of unground POF A is about 40
lower than the specific gravity of ope (Tay 1990) However the specific gravity of POF A is
increased and it is about in the range of 222-278 after the grinding process (Sata et al 2004
Tangchirapat et al 2009) It is because the particle size of POF A is reduced and then the
porosity also decreased as results from grinding processes
143 Particle Shape and Size
The particle shape and size of unground POF A is different as compare to ground POF A It
was found that the particle shape and size are mostly large spherical and porous as shown in
Figure 22 In contrast ground POF A is quite similar to Portland cement which crushed
particle is usually in irregular and angular shape as shown in Figure 21 amp 23 ( Chindaprasirt
et al 2007) The particle size of unground POFA is larger than OPC however the particle
size of ground POF A is smaller than OPe The typical particle size distributions of unground
and ground POF A and ope are shown in Figure 24 The median particle size of unground
POFA is about 543)lm -183)lm which is larger than ope which is in the range of I011m -20
1Jlll However the particle size of POFA is decreased to 72)lffi -lO1)lm after grinding
processes (Sata et al 2004 Chindaprasit et at 2008)
11
Figure 21 OPC (Chindaprasirt et ai 2007) Figure 22 Unground POFA (Jaturapitakkul
et ai 2007)
Figure 23 Ground POFA (Jaturapitakkul et ai 2007)
100 r==III~~iITinTI-1M-7I1
II
rriTiT11 Ground POFA JIl jill
90 ope mill J UOOUnd POFA t++tt+-l~I11H80 III IIT~+IIiI--+++IH
70 ~~t+~~UU~~~I IIIV-J~~U oo ~~U~~~Hm+M~~~I~~~
50 +-+tttlitl t-+-Ii+Itflt-+f+TMIlH-i++IHIt-I+tt+Ilt-i~ 1JlIIlt~ 40 +-r-lliM-=-+WII--l-+4R-++I r-H+fllf-++I I N+-i
~ ~~~I~~~~~J~Ir+~ 2o ~~~~~~~~~~~~~~~I I10 ~~~~~~A~~~_I_I~~~ o 1 w
001 01 10 00 1000 10000
Particle size (~m)
Figure 24 Particle size distribution of un ground and ground POFA and OPC (Sata et ai
2004)
12
ABSTRACT
(palm oil industry in Malaysia is well known as the most important agricultural industry
Million tonnes of palm oil fuel ash (POF A) is being generated every year without any
profitable return POF A has the potential to be used as recycle materials due to their
pozzolanic behaviour Thus this research project presents the effect of palm oil fuel ash
(POFA) on the mechanical properties of concrete In this research project POF A was used as
supplementary cementing material to replace cement in concrete production This is because
POF A contains siliceous composition which produces a stronger and denser concrete Three
different fineness of POFA (passing through 38jUll 63jUll and 75jUll) were used to replace
ordinary portland cement at 15 by weight of cement throughout this research project In the
mix proportion a mix design ratio of 1 115295 (Cement Fine Aggregate Coarse Aggregate)
in term of weight of the components was constant for all mixtures In this research project
three laboratory experimentai tests were carried out namely slump test compressive strength
test and splitting tensile strength test The strength of POF A concrete are tested and
determined at 3 7 and 28 days Workability in terms of slump and strength properties of
POF A concrete were studied and compared with control specimen as well The study revealed
that POF A fmeness had significant effect on the workability and strength of concrete The test
results indicated th~ higher slump with higher fineness than those with lower fineness
Compressive strength and splitting tensile strength was found to increase with the increase of
POFA fineness Consequently it was found that POFA concrete produces lower strength than
OPC concrete
v
ABSTRAK
Industri minyak sawit di Malaysia terkenal sebagai industri pertanian yang paling penting
Juta tan abu bahan api kelapa sawit (POF A) sedang dijana setiap tahun tanpa apa-apa
pulangan yang menguntungkan POF A mempunyai potensi untuk digunakan sebagai bahan
kitar semula kerana tingkah laku pozzolanic mereka Oleh itu projek penyelidikan ini
memberikan kesan abu bahan api kelapa sawit (POF A) terhadap sifat mekanikal konkrit
Dalam projek kajian ini POF A telah digunakan sebagai bahan penyimenan tambahan untuk
menggantikan simen dalam konkrit Ini kerana POF A mengandungi komposisi bersilika yang
menghasilkan konkrit yang lebih kukuh dan lebih padat Tiga kehalusan POF A yang
berlainan (melalui 38 ~m 63lfl1 dan 75 1~m) telah digunakan untuk menggantikan simen
portland biasa pada 15 mengikut berat simen sepanjang projek penyelidikan ini Dalam
nisbah campuran nisbah reka bentuk campuran 1 115 295 (Cement Agregat Halus
Agregat Kasar) dari segi berat komponen adalah malar bagi semua campuran Dalam projek
penyelidikan ini tiga ujian ujikaji makmal yang telah dijalankan iaitu ujian kemerosotan
ujian kekuatan mampatan dan membelah ujian kekuatan tegangan Kekuatan konkrit POF A
diuji dan ditentukan pada 3 7 dan 28 hari Kebolehkerjaan dari segi kemerosotan kekuatan
dan sifat-sifat konkrit POF A telah dikaji dan dibandingkan dengan spesimen kawalan juga
Kajian ini mendedahkan bahawa POF A kehalusan mempunyai kesan yang besar ke atas kebolehkerjaan dan kekuatan konkrit Keputusan ujian menunjukkan kemerosotan yang lebih
tinggi dengan kehalusan yang lebih tinggi daripada yang dengan kehalusan yang lebih rendah
Kekuatan mampatan dan kekuatan tegangan membelah didapati meningkat dengan
peningkatan kehalusan POF A Oleh itu didapati bahawa POF A konkrit menghasilkan
kekuatan lebih rendah berbanding konkrit OPe
vi
Pusat Khidmat MakJumat Akademj) UlI1VERSITI MALAYSIA SARAW
TABLE OF CONTENTS
DECLARATION II II II II II bullbull II bullbullbull II II II II bullbullbullbullbullbullbullbull II bullbull II bullbull II II II II bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull II II II II II II II bullbullbullbullbullbullbullbullbullbullbullbull II bullbullbullbullbullbullbullbull U
ACKllOWLEDGEMENTI ivII II II bullbull II II II II II II II II II bullbullbullbullbull II bullbullbullbull II II II II II II II bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull II II II II II II bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull II bullbullbullbull
ABSTRACT II bullbullbullbullbull II bullbullbullbullbullbullbullbullbullbullbull II II II II bullbull II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II bullbull V
TABLE OF CONTENTS II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II bullbullbullbullbullbullbull vii
LIST OF TABLES XII II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II bullbullbullbullbullbullbull
LIST OF FIGURES xiII II II II II II II bullbullbullbullbullbullbullbullbullbullbullbullbull II II II II II II II II II II bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull
LIST OF APPENDICES xii
CHAPTER 1 INTRODUCTION
11 Introduction 1
12 Problem Statement 2
13 Research Significance bull 3
14 Aim and Objectives 3
15 Scope of Work 3
16 Thesis of organisation 4
CHAPTER 2 LITERA TURE REVIEW
21 Introdu~tion 6
22 Admixture 6
23 Types of Mineral Admixture (by-product material)
231 Fly ash 7
232 Blast-furnace slag 8
233 Silica Fume 9
vii
234 Rice Husk ash 9
24 The Physical Properties of POF A
241 Color 10
242 Specific gravity 11
243 Particle shape and size 11
244 Fineness 13
25 The Chemical Properties of PO FA 13
26 Effect of PO FA on the Fresh Properties of Concrete
261 Workability 14
27 Effect of PO FA on the Hardened Properties of Concrete
271 Compressive Strength 15
272 Splitting Tensile Strenampth 17
28 Effect of fineness on the Hardened Properties of concrete 18
29 Concluding Remarks 19
CHAPTER 3 METHODOLOGY
31 General 20
32 Material Properties Tests 20
33 Materials Used for Research Project
331 Palm Oil Fuel Ash (POFA) 21
332 Ordinary Portland Cement (OPC) 23
333 Fine Aggregate 23
viii
334 Coarse Aggregate 24
335 Water 25
34 Concrete Mix Proportions
341 Concrete Mixing 26
342 Concrete Casting 27
343 Concrete Curing 27
35 Fresh Concrete Test
351 Slump Test 27
36 Hardened Concrete Tests
361 Compressive Strength Test 27
362 Splitting Tensile Strength Test 28
CHAPTER 4 RESULTS AND DISCUSSION
41 Introduction 29
42 The Effects of PO FA Fineness on Workability of Concrete 29
43 The Effects of PO FA fmeness on Compressive Strength of Concrete 30
44 The Effects of POF A Fineness on Splitting Tensile Strength of Concre 34
CHAPTER 5 CONCLUSIONS AND RECOMMENDA nONS
51 Conclusions 38
52 Recommendations 39
REFERENCES 41
APPENDICES ~ 45
ix
LIST OF TABLES
Table 21 Physical properties ofunground and ground POFA (Safiuddin et aI 2011) 10
Table 22 Chemical composition ofOPC and PO FA (Source Awal 1997 Tangchirapat
Table 23 Effect of POF A on the workability of concrete (Eldagal 2008 Sata et aI 2007
2007 Eldagal 2008) 14
Tay1990) 15
Table 31 Aggregates Properties Laboratory Tests 21
Table 32 Chemical composition of OPC ASTM Type 1 23
Table 33 Physical properties of fine aggregate 23
Table 34 Physical properties of coarse aggregate 24
Table 35 Mix Proportion 26
Table 41 Slump 29
Table 42 Compressive strength for 3 7 and 28 days 31
Table 43 Splitting tensile strength for 3 7 and 28 days 35
x
LIST OF FIGURES
Figure 21 OPC (Chindaprasirt et aI 2007) 12
Figure 24 Particle size distribution ofunground and ground POFA and OPC (Sata et aI
Figure 25 Effect ofunground POFA on the compressive strength of concrete at 28 days (Tay
Figure 26 Effect of ground POF A on the compressive strength at different test ages
Figure 27 Effect of ground POFA on the splitting tensile strength of concrete (Sata et aI
Figure 22 Unground POF A (Jaturapitakkul et aI 2007) 12
Fjgure 23 Ground POFA Jaturapitakkul et aI 2007) 12
2004) 12
1990) 17
(Tangchirapat et aI 2009) 17
2007) 18
Figure 31 POFA 22
Figure 32 Sieved POFA 22
Figure 33 Sieve analysis for sand 24
Figure 34 Sieve analysis for coarse aggregate 25
Figure 41 The Slump 30
Figure 42 Compressive Strength for 3 7 and 28 days 33
Figure 43 Splitting Tensile Strength for 3 7 and 28 days 37
LIST OF APPENDICES
APPENDIX A Processes of Specific Gravity of Coarse Aggregate 45
APPENDIX B Processes of Specific Gravity of Fine Aggreagte 46
APPENDIX C Processes of Concrete Mixing Casting and Curing 48
APPENDIX D Processes of Slump Test 50
APPENDIX E Processes of Compressive Strength Test 51
APPENDIX F Processes of Splitting Tensile Strength Test 52
xii
CHAPTER 1
INTRODUCTION
11 Introduction
Concrete is usually a composite material that is used in civil engineering construction work It
is typically a mixture of cement water aggregate and also other admixtures Concrete is
strong in compression because the aggregate has the ability to carry the compression load
however it is extremely weak in tension
Cement consists of adhesive and cohesive properties which enable it to bond mineral
fragments into a solid mass Cement contains silicates and aluminates of lime which are made
from blended and ground limestone and clay According to Dobrowolski (1998) portland
cement is the most commonly used hydraulic ~ement for making concrete around the world It
is considered as the most significant component of hydraulic cement which hardens due to
hydration a chemical reaction between cement powder and water In concrete design and
quality control strength is the property usually specified The water-cementitious materials
ratio the extent of hydration the curing and environmental conditions are the main factors
that influence the strength of concrete The ultimate compressive strength and rate of strength
development of concrete are also greatly dependent on the chemical and physical properties of
the cement
Higher demands for construction works have contributed to augmentation of cement
production as one of the main components of concrete manufacture As a result the
production of cement leads to increase the concern of global warming as CO2 emission is
released to atmosphere However the variety of studies about various supplementary
1
cementing material involved in concrete production has been conducted in recent years
Nowadays the use of various supplementary cementing materials such as Fly Ash Blastshy
Furnace Slag Silica Fume Rice husk Ash and other fiber and pozzolanic material are gaining
popularity due to increasingly stringent environmental legislation In addition the use of
various supplementary cementing materials is also a common practice since they are
significantly reducing the cement content and improve the ultimate strength of the concrete
In this study the study about the use of Palm Oil Fuel Ash (POF A) as a supplementary
cementing material in concrete production is carried out The influence of POF A and its
degree of fmeness on the mechanical properties of concrete is investigated In Malaysia palm
oil industry is considered as the most important agro industries POF A is a by-product which
is generated from the combustion of palm oil plant residues In this study POF A is used as a
pozzolanic material and also a replacement of cement in concrete to produce cementitious
properties Pozzolan is defined as a siliceous or siliceous and aluminous material where the
particles react with calcium hydroxide from the cement to produce cementitious properties
The utilization of pozzolanic material in concrete would reduce the negative environmental
effect and landfill volume for the disposal of wastes
12 Problem Statement
The presence of palm oil wastes has created a major disposal problem due to a large amount
of solid waste materials is produced such as palm fiber nutshells and empty fruit bunches
from palm oil industry which is burnt at temperatures of about 800-1000 degC as fuels to
provide steam for electricity generation in palm oil mills After the burning process an ash
by-product are obtained which is about 5 by weight of the residues known as palm oil fuel
ash (pOF A) It has been reported that around 4 million tonsyears of POF A are produced in
2
Malaysia only (Zarina 2012) While the quantity of PO FA is rising annually its utilization is
limited and basically disposed of as a waste in landfills without any profitable return It can
also affect environmental problems such as health hazards and financial loss
13 Research Significance
There are several significances in this research project Firstly PDFA is incorporated as
supplementary cementing material in the concrete mix as to promote the use of agricultural
waste and create a more sustainable environment besides its own ability to improve strength
development of concrete Next it is also important that to obtain a mix proportion to produce
concrete incorporated with PDFA and studies the mechanical properties of concrete in term of
compressive strength and splitting tensile strength
14 Aim and Objectives
The aim of this research project is to conduct an experimental testing program to determine
the effects of PDFA fineness on the mechanical properties of concrete The objectives of the
research project are
1 To obtain a mix proportion containing different PDFA fineness which can achieve a
targeted strength of 30 Nmm2 at 28 days and slump of 60mm-180mm
II To study the mechanical properties of concr~te by using POFA with 3 different
fineness which are passing through 38wn 631m and 751m
1S Scope of work
The study focuses on the effect of PDFA fineness on the mechanical properties of concrete
The study only limited to test for three types of PDFA fineness which are 381m 631ffi and
3
75JlM with 15 PDFA replacement Three laboratories experimental tests is carried out
namely slump test compressive strength test and splitting tensile strength test The slump test
is carried out to detennine the workability of fresh concrete The concrete sample is cured in
the water and tested for 3 days 7 days and 28 days strength Consequently two mechanical
properties of concrete such as compressive strength and splitting tensile strength will be tested
in this study
16 Thesis Organisation
This report contains five chapters which are introduction literature review methodology
result and discussion and conclusion respectively
Chapter I discuss the general background of the research problem statement scope of work
aim and objectives and thesis significance
Chapter 2 discuss the admixture which is also one of the components of concrete mix Besides
that a general background for four types of pozzolanic materials such as fly ash blast furnace
slag silica fume and rice husk ash will be discussed in this chapter In addition the properties
of PDF A such as physical and chemical composition will also be discussed in this chapter
Moreover a previous study about the effect of PDF A on the mechanical properties of
concrete will be studied Lastly a previous research about the effect of fineness on properties
ofconcrete will be also discussed
Chapter 3 explain various laboratory tests will be carried out in this chapter In this chapter
three laboratory experiments will be conducted such as slump test compressive strength test
and splitting tensile strength test In addition experiment setups will be stated in this chapter
4
r-~-------~-----p~rKhldmat Mak1umat Akauemillt UNIVERSrn MALAYSIA SAltAWAIlt
Chapter 4 generally presents and discusses about the result of each laboratory tests that
conducted in tenn of compressive strength and splitting tensile strength
Chapter 5 conclude the whole study has been conducted A conclusion has been drawn with
relevant objectives stated based on the result achieved from this study Besides that there are
few recommendations will be listed in this chapter
5
CHAPTER 2
LITERATURE REVIEW
21 Introduction
During recent decades there are many researchers have been carried out for the use of
admixture in concrete mixture such as fly ash blast-furnace slag silica fume rice husk ash
and also palm oil fuel ash Besides that the properties of POF A are also briefly discussed and
previous study about the effects of POF A on the mechanical properties of concrete are also
reviewed Lastly previous study about the effects of fineness on the properties of concrete are
also reviewed
22 Admixture
Admixture is used as an additional material which is added to concrete mixtures It is varying
widely in chemical composition from surfactants and soluble salts to polymers and insoluble
minerals The properties of concrete such as workability strength and durability can be
improved by adding admixtures to concrete batch (Monte rio amp Mehta 2006) Besides that
the use of admixture in concrete mixtures may also increase or decrease the cost of concrete
by lowering the required cement content changing the volume of the concrete mixture or
reducing the cost of concrete placing and finishing Thus admixture plays an important role
in concrete mixtures Admixture can be categorised into 2 categorise which is mineral
admixture (fly ash silica fume and others) and chemical admixture (air-entering agents
accelerators water-reducing admixtures However mineral admixtures are more emphasized
in this study and used as supplementary cementitious material for producing concrete
6
Mineral admixtures are categorised into 2 classifications which are natural materials and byshy
product materials Some mineral admixtures can be pozzolanic cementitious and however
others are both cementitious and pozzolanic (Monterio amp Mehta 2006) Natural materials are
defined as a material that has been treated for the only purpose of making a pozzolan
Generally the process involves crushing grinding and size separation occasionally it may
also include thermal activation On the other hand by-product materials are defined as a
material that is not the primary products which produced from industry It mayor may not
require any processing before use as mineral admixtures
However by-product materials are more highlighted in this study Consequently the physiGal
and chemical and mineralogical properties of palm oil fuel ash (PDF A) will be further
discussed in this study Besides that effect of PDF A on the mechanical properties of concrete
will be also discussed in this study
23 Types of Mineral Admixtures from By-product
A variety of by-product materials such as fly ash blast-furnace slag silica fume rice husk ash
and others have been commonly used as pozzolanic materials in concrete The utilization of
pozzolanic material not only enhances the properties of concrete but also protects the
environment
231 Fly Ash
According to Day (2006) fly ash is also known as pulverized fuel ash which is produced from
the combustion of coal in thermal power plants During combustion the mineral impurities
such as clays quartz and feldspar melt in suspension at the high temperature and float out
with the flue gas stream As the fused material rises it is transported to low temperature zones
7
allow it cools and then it solidifies as spherical particles of glass which are called fly ash This
fly ash is collected from the flue gas stream by mechanical separators electrostatic
precipitation or bag filters (Nawy 2008) Fly ash can be categorised into two different types
which are Class C and Class F (ASTM C 618-78) Class C ash is consists of high-calcium fly
ashes with carbon content less than 2 while Class F ash contains low-calcium fly ashes
with carbon content less than 5 but sometimes as high as 10 Class C ash is usually
obtained from burning sub-bituminous or lignite coals whereas Class F ashes are obtained
from burning bituminous or anthracite coals The chemical and physical properties of the ash
have significant impact on the performance properties between Class F and C ashes The
physical properties of fly ashes are depending to the source Fly ash is a fine-grained material
which contains spherical glassy particles The particles can be irregular or angular shapes and
its size is depending on the sources The particles of fly ash may be finer or coarser than
Portland cement particles On the other hand the mineralogical properties of fly ash are
significant influenced by both the type and source of fly ash Fly ash contains noncrystalline
particles or glass and a small quantity of crystalline material as result from the rapid cooling
ofburned coal in the power plant
232 Blast-Furnace Slag
Blast-furnace slag is a by-product of the production of iron (Nawy 2008) When it is quickly
cool down with water to glassy state and finely ground thus the property of latent
hydraulicity will be developed (Nawy 2008) Nowadays the use of blast-furnace slag as an
admixture in concrete is well established In the early 1970s glassy slag was produced by
using pelletizing process which uses much less water than granulation methods Firstly a
treatment with water sprays is used to expand the molten slag and then passed over a rotating
8
fInned drum Lastly the semi molten material is cooled and pelletized by throwing them into
the air
233 SUtea Fume
Silica fume is a byproduct of the production of metallic silicon or ferrosilicon alloys which is
produced by electric arc furnaces (Nawy 2008) The two main components such as the types
of alloy fonned and the composition of quartz and coal are commonly used in the electric arc
furnaces which are significantly influence the chemical composition of silica fume The
majority ofpublished data indicates that the utilization of silica fume in concrete must contain
at least 75 ferro silicon
234 Rice Husk Ash
Rice husk ash is a by-product of the agricultural industry which is produced from burning a
mixture of rice husk and eucalyptus bark by fluidized bed combustion process in a biomass
power plant It consists of high amount of Si02 Silica content in the ash increases with higher
the burning temperature Many researches described that rice husk ash consists of high
reactivity and pozzolanic property after burning process at controlled temperature Chemical
composition of rice husk ash is greatly influenced by the temperature during burning
processes
24 The PbysieaJ Properties of POFA
According to AbdullaH et al (2006) the burning temperature condition is one of factors that
significantly influence the physical properties of POFA Several of physical properties of
9
Wlground and ground POF A used in various studies are shown in Table 21 These all
properties ofunground and ground POFA are briefly discussed below
Table 21 Physical properties of unground and ground POF A (Safiuddin et al 2011)
Properties OPC Unground POFA Ground PO FA
Color Grey Light greywhitish Dark grey
Specific gravity 314-328 178-197 222-278
Median particle size dso(urn) 10-20 543-183 72-101
Passing through 45-urn sieve 56-588 97-99
( mass)
Specific surface area Blaine 314-358 796 882-1244
(m2kg)
Strength activity index () 786-115
SOWldness Le Chatelier 045-1 05-26
expansion (mm)
141 Color
UngroWld POF A is usually in light grey color as results from the unburnt carbon content left
at relatively low burning temperature The content of unburnt carbon becomes very low when
the burning temperature is high Besides that unground POF A can also be whitish color in the
absence of unburnt carbon (Abdullah et al 2006) On the other hand ground POF A is dark
grey color
10
141 Specific Gravity
The specific gravity of unground POFA is normally varies in the range of 178-197 From
Table 21 above it can be seen that the specific gravity of unground POF A is about 40
lower than the specific gravity of ope (Tay 1990) However the specific gravity of POF A is
increased and it is about in the range of 222-278 after the grinding process (Sata et al 2004
Tangchirapat et al 2009) It is because the particle size of POF A is reduced and then the
porosity also decreased as results from grinding processes
143 Particle Shape and Size
The particle shape and size of unground POF A is different as compare to ground POF A It
was found that the particle shape and size are mostly large spherical and porous as shown in
Figure 22 In contrast ground POF A is quite similar to Portland cement which crushed
particle is usually in irregular and angular shape as shown in Figure 21 amp 23 ( Chindaprasirt
et al 2007) The particle size of unground POFA is larger than OPC however the particle
size of ground POF A is smaller than OPe The typical particle size distributions of unground
and ground POF A and ope are shown in Figure 24 The median particle size of unground
POFA is about 543)lm -183)lm which is larger than ope which is in the range of I011m -20
1Jlll However the particle size of POFA is decreased to 72)lffi -lO1)lm after grinding
processes (Sata et al 2004 Chindaprasit et at 2008)
11
Figure 21 OPC (Chindaprasirt et ai 2007) Figure 22 Unground POFA (Jaturapitakkul
et ai 2007)
Figure 23 Ground POFA (Jaturapitakkul et ai 2007)
100 r==III~~iITinTI-1M-7I1
II
rriTiT11 Ground POFA JIl jill
90 ope mill J UOOUnd POFA t++tt+-l~I11H80 III IIT~+IIiI--+++IH
70 ~~t+~~UU~~~I IIIV-J~~U oo ~~U~~~Hm+M~~~I~~~
50 +-+tttlitl t-+-Ii+Itflt-+f+TMIlH-i++IHIt-I+tt+Ilt-i~ 1JlIIlt~ 40 +-r-lliM-=-+WII--l-+4R-++I r-H+fllf-++I I N+-i
~ ~~~I~~~~~J~Ir+~ 2o ~~~~~~~~~~~~~~~I I10 ~~~~~~A~~~_I_I~~~ o 1 w
001 01 10 00 1000 10000
Particle size (~m)
Figure 24 Particle size distribution of un ground and ground POFA and OPC (Sata et ai
2004)
12
ABSTRAK
Industri minyak sawit di Malaysia terkenal sebagai industri pertanian yang paling penting
Juta tan abu bahan api kelapa sawit (POF A) sedang dijana setiap tahun tanpa apa-apa
pulangan yang menguntungkan POF A mempunyai potensi untuk digunakan sebagai bahan
kitar semula kerana tingkah laku pozzolanic mereka Oleh itu projek penyelidikan ini
memberikan kesan abu bahan api kelapa sawit (POF A) terhadap sifat mekanikal konkrit
Dalam projek kajian ini POF A telah digunakan sebagai bahan penyimenan tambahan untuk
menggantikan simen dalam konkrit Ini kerana POF A mengandungi komposisi bersilika yang
menghasilkan konkrit yang lebih kukuh dan lebih padat Tiga kehalusan POF A yang
berlainan (melalui 38 ~m 63lfl1 dan 75 1~m) telah digunakan untuk menggantikan simen
portland biasa pada 15 mengikut berat simen sepanjang projek penyelidikan ini Dalam
nisbah campuran nisbah reka bentuk campuran 1 115 295 (Cement Agregat Halus
Agregat Kasar) dari segi berat komponen adalah malar bagi semua campuran Dalam projek
penyelidikan ini tiga ujian ujikaji makmal yang telah dijalankan iaitu ujian kemerosotan
ujian kekuatan mampatan dan membelah ujian kekuatan tegangan Kekuatan konkrit POF A
diuji dan ditentukan pada 3 7 dan 28 hari Kebolehkerjaan dari segi kemerosotan kekuatan
dan sifat-sifat konkrit POF A telah dikaji dan dibandingkan dengan spesimen kawalan juga
Kajian ini mendedahkan bahawa POF A kehalusan mempunyai kesan yang besar ke atas kebolehkerjaan dan kekuatan konkrit Keputusan ujian menunjukkan kemerosotan yang lebih
tinggi dengan kehalusan yang lebih tinggi daripada yang dengan kehalusan yang lebih rendah
Kekuatan mampatan dan kekuatan tegangan membelah didapati meningkat dengan
peningkatan kehalusan POF A Oleh itu didapati bahawa POF A konkrit menghasilkan
kekuatan lebih rendah berbanding konkrit OPe
vi
Pusat Khidmat MakJumat Akademj) UlI1VERSITI MALAYSIA SARAW
TABLE OF CONTENTS
DECLARATION II II II II II bullbull II bullbullbull II II II II bullbullbullbullbullbullbullbull II bullbull II bullbull II II II II bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull II II II II II II II bullbullbullbullbullbullbullbullbullbullbullbull II bullbullbullbullbullbullbullbull U
ACKllOWLEDGEMENTI ivII II II bullbull II II II II II II II II II bullbullbullbullbull II bullbullbullbull II II II II II II II bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull II II II II II II bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull II bullbullbullbull
ABSTRACT II bullbullbullbullbull II bullbullbullbullbullbullbullbullbullbullbull II II II II bullbull II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II bullbull V
TABLE OF CONTENTS II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II bullbullbullbullbullbullbull vii
LIST OF TABLES XII II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II bullbullbullbullbullbullbull
LIST OF FIGURES xiII II II II II II II bullbullbullbullbullbullbullbullbullbullbullbullbull II II II II II II II II II II bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull
LIST OF APPENDICES xii
CHAPTER 1 INTRODUCTION
11 Introduction 1
12 Problem Statement 2
13 Research Significance bull 3
14 Aim and Objectives 3
15 Scope of Work 3
16 Thesis of organisation 4
CHAPTER 2 LITERA TURE REVIEW
21 Introdu~tion 6
22 Admixture 6
23 Types of Mineral Admixture (by-product material)
231 Fly ash 7
232 Blast-furnace slag 8
233 Silica Fume 9
vii
234 Rice Husk ash 9
24 The Physical Properties of POF A
241 Color 10
242 Specific gravity 11
243 Particle shape and size 11
244 Fineness 13
25 The Chemical Properties of PO FA 13
26 Effect of PO FA on the Fresh Properties of Concrete
261 Workability 14
27 Effect of PO FA on the Hardened Properties of Concrete
271 Compressive Strength 15
272 Splitting Tensile Strenampth 17
28 Effect of fineness on the Hardened Properties of concrete 18
29 Concluding Remarks 19
CHAPTER 3 METHODOLOGY
31 General 20
32 Material Properties Tests 20
33 Materials Used for Research Project
331 Palm Oil Fuel Ash (POFA) 21
332 Ordinary Portland Cement (OPC) 23
333 Fine Aggregate 23
viii
334 Coarse Aggregate 24
335 Water 25
34 Concrete Mix Proportions
341 Concrete Mixing 26
342 Concrete Casting 27
343 Concrete Curing 27
35 Fresh Concrete Test
351 Slump Test 27
36 Hardened Concrete Tests
361 Compressive Strength Test 27
362 Splitting Tensile Strength Test 28
CHAPTER 4 RESULTS AND DISCUSSION
41 Introduction 29
42 The Effects of PO FA Fineness on Workability of Concrete 29
43 The Effects of PO FA fmeness on Compressive Strength of Concrete 30
44 The Effects of POF A Fineness on Splitting Tensile Strength of Concre 34
CHAPTER 5 CONCLUSIONS AND RECOMMENDA nONS
51 Conclusions 38
52 Recommendations 39
REFERENCES 41
APPENDICES ~ 45
ix
LIST OF TABLES
Table 21 Physical properties ofunground and ground POFA (Safiuddin et aI 2011) 10
Table 22 Chemical composition ofOPC and PO FA (Source Awal 1997 Tangchirapat
Table 23 Effect of POF A on the workability of concrete (Eldagal 2008 Sata et aI 2007
2007 Eldagal 2008) 14
Tay1990) 15
Table 31 Aggregates Properties Laboratory Tests 21
Table 32 Chemical composition of OPC ASTM Type 1 23
Table 33 Physical properties of fine aggregate 23
Table 34 Physical properties of coarse aggregate 24
Table 35 Mix Proportion 26
Table 41 Slump 29
Table 42 Compressive strength for 3 7 and 28 days 31
Table 43 Splitting tensile strength for 3 7 and 28 days 35
x
LIST OF FIGURES
Figure 21 OPC (Chindaprasirt et aI 2007) 12
Figure 24 Particle size distribution ofunground and ground POFA and OPC (Sata et aI
Figure 25 Effect ofunground POFA on the compressive strength of concrete at 28 days (Tay
Figure 26 Effect of ground POF A on the compressive strength at different test ages
Figure 27 Effect of ground POFA on the splitting tensile strength of concrete (Sata et aI
Figure 22 Unground POF A (Jaturapitakkul et aI 2007) 12
Fjgure 23 Ground POFA Jaturapitakkul et aI 2007) 12
2004) 12
1990) 17
(Tangchirapat et aI 2009) 17
2007) 18
Figure 31 POFA 22
Figure 32 Sieved POFA 22
Figure 33 Sieve analysis for sand 24
Figure 34 Sieve analysis for coarse aggregate 25
Figure 41 The Slump 30
Figure 42 Compressive Strength for 3 7 and 28 days 33
Figure 43 Splitting Tensile Strength for 3 7 and 28 days 37
LIST OF APPENDICES
APPENDIX A Processes of Specific Gravity of Coarse Aggregate 45
APPENDIX B Processes of Specific Gravity of Fine Aggreagte 46
APPENDIX C Processes of Concrete Mixing Casting and Curing 48
APPENDIX D Processes of Slump Test 50
APPENDIX E Processes of Compressive Strength Test 51
APPENDIX F Processes of Splitting Tensile Strength Test 52
xii
CHAPTER 1
INTRODUCTION
11 Introduction
Concrete is usually a composite material that is used in civil engineering construction work It
is typically a mixture of cement water aggregate and also other admixtures Concrete is
strong in compression because the aggregate has the ability to carry the compression load
however it is extremely weak in tension
Cement consists of adhesive and cohesive properties which enable it to bond mineral
fragments into a solid mass Cement contains silicates and aluminates of lime which are made
from blended and ground limestone and clay According to Dobrowolski (1998) portland
cement is the most commonly used hydraulic ~ement for making concrete around the world It
is considered as the most significant component of hydraulic cement which hardens due to
hydration a chemical reaction between cement powder and water In concrete design and
quality control strength is the property usually specified The water-cementitious materials
ratio the extent of hydration the curing and environmental conditions are the main factors
that influence the strength of concrete The ultimate compressive strength and rate of strength
development of concrete are also greatly dependent on the chemical and physical properties of
the cement
Higher demands for construction works have contributed to augmentation of cement
production as one of the main components of concrete manufacture As a result the
production of cement leads to increase the concern of global warming as CO2 emission is
released to atmosphere However the variety of studies about various supplementary
1
cementing material involved in concrete production has been conducted in recent years
Nowadays the use of various supplementary cementing materials such as Fly Ash Blastshy
Furnace Slag Silica Fume Rice husk Ash and other fiber and pozzolanic material are gaining
popularity due to increasingly stringent environmental legislation In addition the use of
various supplementary cementing materials is also a common practice since they are
significantly reducing the cement content and improve the ultimate strength of the concrete
In this study the study about the use of Palm Oil Fuel Ash (POF A) as a supplementary
cementing material in concrete production is carried out The influence of POF A and its
degree of fmeness on the mechanical properties of concrete is investigated In Malaysia palm
oil industry is considered as the most important agro industries POF A is a by-product which
is generated from the combustion of palm oil plant residues In this study POF A is used as a
pozzolanic material and also a replacement of cement in concrete to produce cementitious
properties Pozzolan is defined as a siliceous or siliceous and aluminous material where the
particles react with calcium hydroxide from the cement to produce cementitious properties
The utilization of pozzolanic material in concrete would reduce the negative environmental
effect and landfill volume for the disposal of wastes
12 Problem Statement
The presence of palm oil wastes has created a major disposal problem due to a large amount
of solid waste materials is produced such as palm fiber nutshells and empty fruit bunches
from palm oil industry which is burnt at temperatures of about 800-1000 degC as fuels to
provide steam for electricity generation in palm oil mills After the burning process an ash
by-product are obtained which is about 5 by weight of the residues known as palm oil fuel
ash (pOF A) It has been reported that around 4 million tonsyears of POF A are produced in
2
Malaysia only (Zarina 2012) While the quantity of PO FA is rising annually its utilization is
limited and basically disposed of as a waste in landfills without any profitable return It can
also affect environmental problems such as health hazards and financial loss
13 Research Significance
There are several significances in this research project Firstly PDFA is incorporated as
supplementary cementing material in the concrete mix as to promote the use of agricultural
waste and create a more sustainable environment besides its own ability to improve strength
development of concrete Next it is also important that to obtain a mix proportion to produce
concrete incorporated with PDFA and studies the mechanical properties of concrete in term of
compressive strength and splitting tensile strength
14 Aim and Objectives
The aim of this research project is to conduct an experimental testing program to determine
the effects of PDFA fineness on the mechanical properties of concrete The objectives of the
research project are
1 To obtain a mix proportion containing different PDFA fineness which can achieve a
targeted strength of 30 Nmm2 at 28 days and slump of 60mm-180mm
II To study the mechanical properties of concr~te by using POFA with 3 different
fineness which are passing through 38wn 631m and 751m
1S Scope of work
The study focuses on the effect of PDFA fineness on the mechanical properties of concrete
The study only limited to test for three types of PDFA fineness which are 381m 631ffi and
3
75JlM with 15 PDFA replacement Three laboratories experimental tests is carried out
namely slump test compressive strength test and splitting tensile strength test The slump test
is carried out to detennine the workability of fresh concrete The concrete sample is cured in
the water and tested for 3 days 7 days and 28 days strength Consequently two mechanical
properties of concrete such as compressive strength and splitting tensile strength will be tested
in this study
16 Thesis Organisation
This report contains five chapters which are introduction literature review methodology
result and discussion and conclusion respectively
Chapter I discuss the general background of the research problem statement scope of work
aim and objectives and thesis significance
Chapter 2 discuss the admixture which is also one of the components of concrete mix Besides
that a general background for four types of pozzolanic materials such as fly ash blast furnace
slag silica fume and rice husk ash will be discussed in this chapter In addition the properties
of PDF A such as physical and chemical composition will also be discussed in this chapter
Moreover a previous study about the effect of PDF A on the mechanical properties of
concrete will be studied Lastly a previous research about the effect of fineness on properties
ofconcrete will be also discussed
Chapter 3 explain various laboratory tests will be carried out in this chapter In this chapter
three laboratory experiments will be conducted such as slump test compressive strength test
and splitting tensile strength test In addition experiment setups will be stated in this chapter
4
r-~-------~-----p~rKhldmat Mak1umat Akauemillt UNIVERSrn MALAYSIA SAltAWAIlt
Chapter 4 generally presents and discusses about the result of each laboratory tests that
conducted in tenn of compressive strength and splitting tensile strength
Chapter 5 conclude the whole study has been conducted A conclusion has been drawn with
relevant objectives stated based on the result achieved from this study Besides that there are
few recommendations will be listed in this chapter
5
CHAPTER 2
LITERATURE REVIEW
21 Introduction
During recent decades there are many researchers have been carried out for the use of
admixture in concrete mixture such as fly ash blast-furnace slag silica fume rice husk ash
and also palm oil fuel ash Besides that the properties of POF A are also briefly discussed and
previous study about the effects of POF A on the mechanical properties of concrete are also
reviewed Lastly previous study about the effects of fineness on the properties of concrete are
also reviewed
22 Admixture
Admixture is used as an additional material which is added to concrete mixtures It is varying
widely in chemical composition from surfactants and soluble salts to polymers and insoluble
minerals The properties of concrete such as workability strength and durability can be
improved by adding admixtures to concrete batch (Monte rio amp Mehta 2006) Besides that
the use of admixture in concrete mixtures may also increase or decrease the cost of concrete
by lowering the required cement content changing the volume of the concrete mixture or
reducing the cost of concrete placing and finishing Thus admixture plays an important role
in concrete mixtures Admixture can be categorised into 2 categorise which is mineral
admixture (fly ash silica fume and others) and chemical admixture (air-entering agents
accelerators water-reducing admixtures However mineral admixtures are more emphasized
in this study and used as supplementary cementitious material for producing concrete
6
Mineral admixtures are categorised into 2 classifications which are natural materials and byshy
product materials Some mineral admixtures can be pozzolanic cementitious and however
others are both cementitious and pozzolanic (Monterio amp Mehta 2006) Natural materials are
defined as a material that has been treated for the only purpose of making a pozzolan
Generally the process involves crushing grinding and size separation occasionally it may
also include thermal activation On the other hand by-product materials are defined as a
material that is not the primary products which produced from industry It mayor may not
require any processing before use as mineral admixtures
However by-product materials are more highlighted in this study Consequently the physiGal
and chemical and mineralogical properties of palm oil fuel ash (PDF A) will be further
discussed in this study Besides that effect of PDF A on the mechanical properties of concrete
will be also discussed in this study
23 Types of Mineral Admixtures from By-product
A variety of by-product materials such as fly ash blast-furnace slag silica fume rice husk ash
and others have been commonly used as pozzolanic materials in concrete The utilization of
pozzolanic material not only enhances the properties of concrete but also protects the
environment
231 Fly Ash
According to Day (2006) fly ash is also known as pulverized fuel ash which is produced from
the combustion of coal in thermal power plants During combustion the mineral impurities
such as clays quartz and feldspar melt in suspension at the high temperature and float out
with the flue gas stream As the fused material rises it is transported to low temperature zones
7
allow it cools and then it solidifies as spherical particles of glass which are called fly ash This
fly ash is collected from the flue gas stream by mechanical separators electrostatic
precipitation or bag filters (Nawy 2008) Fly ash can be categorised into two different types
which are Class C and Class F (ASTM C 618-78) Class C ash is consists of high-calcium fly
ashes with carbon content less than 2 while Class F ash contains low-calcium fly ashes
with carbon content less than 5 but sometimes as high as 10 Class C ash is usually
obtained from burning sub-bituminous or lignite coals whereas Class F ashes are obtained
from burning bituminous or anthracite coals The chemical and physical properties of the ash
have significant impact on the performance properties between Class F and C ashes The
physical properties of fly ashes are depending to the source Fly ash is a fine-grained material
which contains spherical glassy particles The particles can be irregular or angular shapes and
its size is depending on the sources The particles of fly ash may be finer or coarser than
Portland cement particles On the other hand the mineralogical properties of fly ash are
significant influenced by both the type and source of fly ash Fly ash contains noncrystalline
particles or glass and a small quantity of crystalline material as result from the rapid cooling
ofburned coal in the power plant
232 Blast-Furnace Slag
Blast-furnace slag is a by-product of the production of iron (Nawy 2008) When it is quickly
cool down with water to glassy state and finely ground thus the property of latent
hydraulicity will be developed (Nawy 2008) Nowadays the use of blast-furnace slag as an
admixture in concrete is well established In the early 1970s glassy slag was produced by
using pelletizing process which uses much less water than granulation methods Firstly a
treatment with water sprays is used to expand the molten slag and then passed over a rotating
8
fInned drum Lastly the semi molten material is cooled and pelletized by throwing them into
the air
233 SUtea Fume
Silica fume is a byproduct of the production of metallic silicon or ferrosilicon alloys which is
produced by electric arc furnaces (Nawy 2008) The two main components such as the types
of alloy fonned and the composition of quartz and coal are commonly used in the electric arc
furnaces which are significantly influence the chemical composition of silica fume The
majority ofpublished data indicates that the utilization of silica fume in concrete must contain
at least 75 ferro silicon
234 Rice Husk Ash
Rice husk ash is a by-product of the agricultural industry which is produced from burning a
mixture of rice husk and eucalyptus bark by fluidized bed combustion process in a biomass
power plant It consists of high amount of Si02 Silica content in the ash increases with higher
the burning temperature Many researches described that rice husk ash consists of high
reactivity and pozzolanic property after burning process at controlled temperature Chemical
composition of rice husk ash is greatly influenced by the temperature during burning
processes
24 The PbysieaJ Properties of POFA
According to AbdullaH et al (2006) the burning temperature condition is one of factors that
significantly influence the physical properties of POFA Several of physical properties of
9
Wlground and ground POF A used in various studies are shown in Table 21 These all
properties ofunground and ground POFA are briefly discussed below
Table 21 Physical properties of unground and ground POF A (Safiuddin et al 2011)
Properties OPC Unground POFA Ground PO FA
Color Grey Light greywhitish Dark grey
Specific gravity 314-328 178-197 222-278
Median particle size dso(urn) 10-20 543-183 72-101
Passing through 45-urn sieve 56-588 97-99
( mass)
Specific surface area Blaine 314-358 796 882-1244
(m2kg)
Strength activity index () 786-115
SOWldness Le Chatelier 045-1 05-26
expansion (mm)
141 Color
UngroWld POF A is usually in light grey color as results from the unburnt carbon content left
at relatively low burning temperature The content of unburnt carbon becomes very low when
the burning temperature is high Besides that unground POF A can also be whitish color in the
absence of unburnt carbon (Abdullah et al 2006) On the other hand ground POF A is dark
grey color
10
141 Specific Gravity
The specific gravity of unground POFA is normally varies in the range of 178-197 From
Table 21 above it can be seen that the specific gravity of unground POF A is about 40
lower than the specific gravity of ope (Tay 1990) However the specific gravity of POF A is
increased and it is about in the range of 222-278 after the grinding process (Sata et al 2004
Tangchirapat et al 2009) It is because the particle size of POF A is reduced and then the
porosity also decreased as results from grinding processes
143 Particle Shape and Size
The particle shape and size of unground POF A is different as compare to ground POF A It
was found that the particle shape and size are mostly large spherical and porous as shown in
Figure 22 In contrast ground POF A is quite similar to Portland cement which crushed
particle is usually in irregular and angular shape as shown in Figure 21 amp 23 ( Chindaprasirt
et al 2007) The particle size of unground POFA is larger than OPC however the particle
size of ground POF A is smaller than OPe The typical particle size distributions of unground
and ground POF A and ope are shown in Figure 24 The median particle size of unground
POFA is about 543)lm -183)lm which is larger than ope which is in the range of I011m -20
1Jlll However the particle size of POFA is decreased to 72)lffi -lO1)lm after grinding
processes (Sata et al 2004 Chindaprasit et at 2008)
11
Figure 21 OPC (Chindaprasirt et ai 2007) Figure 22 Unground POFA (Jaturapitakkul
et ai 2007)
Figure 23 Ground POFA (Jaturapitakkul et ai 2007)
100 r==III~~iITinTI-1M-7I1
II
rriTiT11 Ground POFA JIl jill
90 ope mill J UOOUnd POFA t++tt+-l~I11H80 III IIT~+IIiI--+++IH
70 ~~t+~~UU~~~I IIIV-J~~U oo ~~U~~~Hm+M~~~I~~~
50 +-+tttlitl t-+-Ii+Itflt-+f+TMIlH-i++IHIt-I+tt+Ilt-i~ 1JlIIlt~ 40 +-r-lliM-=-+WII--l-+4R-++I r-H+fllf-++I I N+-i
~ ~~~I~~~~~J~Ir+~ 2o ~~~~~~~~~~~~~~~I I10 ~~~~~~A~~~_I_I~~~ o 1 w
001 01 10 00 1000 10000
Particle size (~m)
Figure 24 Particle size distribution of un ground and ground POFA and OPC (Sata et ai
2004)
12
Pusat Khidmat MakJumat Akademj) UlI1VERSITI MALAYSIA SARAW
TABLE OF CONTENTS
DECLARATION II II II II II bullbull II bullbullbull II II II II bullbullbullbullbullbullbullbull II bullbull II bullbull II II II II bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull II II II II II II II bullbullbullbullbullbullbullbullbullbullbullbull II bullbullbullbullbullbullbullbull U
ACKllOWLEDGEMENTI ivII II II bullbull II II II II II II II II II bullbullbullbullbull II bullbullbullbull II II II II II II II bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull II II II II II II bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull II bullbullbullbull
ABSTRACT II bullbullbullbullbull II bullbullbullbullbullbullbullbullbullbullbull II II II II bullbull II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II bullbull V
TABLE OF CONTENTS II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II bullbullbullbullbullbullbull vii
LIST OF TABLES XII II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II bullbullbullbullbullbullbull
LIST OF FIGURES xiII II II II II II II bullbullbullbullbullbullbullbullbullbullbullbullbull II II II II II II II II II II bullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbullbull
LIST OF APPENDICES xii
CHAPTER 1 INTRODUCTION
11 Introduction 1
12 Problem Statement 2
13 Research Significance bull 3
14 Aim and Objectives 3
15 Scope of Work 3
16 Thesis of organisation 4
CHAPTER 2 LITERA TURE REVIEW
21 Introdu~tion 6
22 Admixture 6
23 Types of Mineral Admixture (by-product material)
231 Fly ash 7
232 Blast-furnace slag 8
233 Silica Fume 9
vii
234 Rice Husk ash 9
24 The Physical Properties of POF A
241 Color 10
242 Specific gravity 11
243 Particle shape and size 11
244 Fineness 13
25 The Chemical Properties of PO FA 13
26 Effect of PO FA on the Fresh Properties of Concrete
261 Workability 14
27 Effect of PO FA on the Hardened Properties of Concrete
271 Compressive Strength 15
272 Splitting Tensile Strenampth 17
28 Effect of fineness on the Hardened Properties of concrete 18
29 Concluding Remarks 19
CHAPTER 3 METHODOLOGY
31 General 20
32 Material Properties Tests 20
33 Materials Used for Research Project
331 Palm Oil Fuel Ash (POFA) 21
332 Ordinary Portland Cement (OPC) 23
333 Fine Aggregate 23
viii
334 Coarse Aggregate 24
335 Water 25
34 Concrete Mix Proportions
341 Concrete Mixing 26
342 Concrete Casting 27
343 Concrete Curing 27
35 Fresh Concrete Test
351 Slump Test 27
36 Hardened Concrete Tests
361 Compressive Strength Test 27
362 Splitting Tensile Strength Test 28
CHAPTER 4 RESULTS AND DISCUSSION
41 Introduction 29
42 The Effects of PO FA Fineness on Workability of Concrete 29
43 The Effects of PO FA fmeness on Compressive Strength of Concrete 30
44 The Effects of POF A Fineness on Splitting Tensile Strength of Concre 34
CHAPTER 5 CONCLUSIONS AND RECOMMENDA nONS
51 Conclusions 38
52 Recommendations 39
REFERENCES 41
APPENDICES ~ 45
ix
LIST OF TABLES
Table 21 Physical properties ofunground and ground POFA (Safiuddin et aI 2011) 10
Table 22 Chemical composition ofOPC and PO FA (Source Awal 1997 Tangchirapat
Table 23 Effect of POF A on the workability of concrete (Eldagal 2008 Sata et aI 2007
2007 Eldagal 2008) 14
Tay1990) 15
Table 31 Aggregates Properties Laboratory Tests 21
Table 32 Chemical composition of OPC ASTM Type 1 23
Table 33 Physical properties of fine aggregate 23
Table 34 Physical properties of coarse aggregate 24
Table 35 Mix Proportion 26
Table 41 Slump 29
Table 42 Compressive strength for 3 7 and 28 days 31
Table 43 Splitting tensile strength for 3 7 and 28 days 35
x
LIST OF FIGURES
Figure 21 OPC (Chindaprasirt et aI 2007) 12
Figure 24 Particle size distribution ofunground and ground POFA and OPC (Sata et aI
Figure 25 Effect ofunground POFA on the compressive strength of concrete at 28 days (Tay
Figure 26 Effect of ground POF A on the compressive strength at different test ages
Figure 27 Effect of ground POFA on the splitting tensile strength of concrete (Sata et aI
Figure 22 Unground POF A (Jaturapitakkul et aI 2007) 12
Fjgure 23 Ground POFA Jaturapitakkul et aI 2007) 12
2004) 12
1990) 17
(Tangchirapat et aI 2009) 17
2007) 18
Figure 31 POFA 22
Figure 32 Sieved POFA 22
Figure 33 Sieve analysis for sand 24
Figure 34 Sieve analysis for coarse aggregate 25
Figure 41 The Slump 30
Figure 42 Compressive Strength for 3 7 and 28 days 33
Figure 43 Splitting Tensile Strength for 3 7 and 28 days 37
LIST OF APPENDICES
APPENDIX A Processes of Specific Gravity of Coarse Aggregate 45
APPENDIX B Processes of Specific Gravity of Fine Aggreagte 46
APPENDIX C Processes of Concrete Mixing Casting and Curing 48
APPENDIX D Processes of Slump Test 50
APPENDIX E Processes of Compressive Strength Test 51
APPENDIX F Processes of Splitting Tensile Strength Test 52
xii
CHAPTER 1
INTRODUCTION
11 Introduction
Concrete is usually a composite material that is used in civil engineering construction work It
is typically a mixture of cement water aggregate and also other admixtures Concrete is
strong in compression because the aggregate has the ability to carry the compression load
however it is extremely weak in tension
Cement consists of adhesive and cohesive properties which enable it to bond mineral
fragments into a solid mass Cement contains silicates and aluminates of lime which are made
from blended and ground limestone and clay According to Dobrowolski (1998) portland
cement is the most commonly used hydraulic ~ement for making concrete around the world It
is considered as the most significant component of hydraulic cement which hardens due to
hydration a chemical reaction between cement powder and water In concrete design and
quality control strength is the property usually specified The water-cementitious materials
ratio the extent of hydration the curing and environmental conditions are the main factors
that influence the strength of concrete The ultimate compressive strength and rate of strength
development of concrete are also greatly dependent on the chemical and physical properties of
the cement
Higher demands for construction works have contributed to augmentation of cement
production as one of the main components of concrete manufacture As a result the
production of cement leads to increase the concern of global warming as CO2 emission is
released to atmosphere However the variety of studies about various supplementary
1
cementing material involved in concrete production has been conducted in recent years
Nowadays the use of various supplementary cementing materials such as Fly Ash Blastshy
Furnace Slag Silica Fume Rice husk Ash and other fiber and pozzolanic material are gaining
popularity due to increasingly stringent environmental legislation In addition the use of
various supplementary cementing materials is also a common practice since they are
significantly reducing the cement content and improve the ultimate strength of the concrete
In this study the study about the use of Palm Oil Fuel Ash (POF A) as a supplementary
cementing material in concrete production is carried out The influence of POF A and its
degree of fmeness on the mechanical properties of concrete is investigated In Malaysia palm
oil industry is considered as the most important agro industries POF A is a by-product which
is generated from the combustion of palm oil plant residues In this study POF A is used as a
pozzolanic material and also a replacement of cement in concrete to produce cementitious
properties Pozzolan is defined as a siliceous or siliceous and aluminous material where the
particles react with calcium hydroxide from the cement to produce cementitious properties
The utilization of pozzolanic material in concrete would reduce the negative environmental
effect and landfill volume for the disposal of wastes
12 Problem Statement
The presence of palm oil wastes has created a major disposal problem due to a large amount
of solid waste materials is produced such as palm fiber nutshells and empty fruit bunches
from palm oil industry which is burnt at temperatures of about 800-1000 degC as fuels to
provide steam for electricity generation in palm oil mills After the burning process an ash
by-product are obtained which is about 5 by weight of the residues known as palm oil fuel
ash (pOF A) It has been reported that around 4 million tonsyears of POF A are produced in
2
Malaysia only (Zarina 2012) While the quantity of PO FA is rising annually its utilization is
limited and basically disposed of as a waste in landfills without any profitable return It can
also affect environmental problems such as health hazards and financial loss
13 Research Significance
There are several significances in this research project Firstly PDFA is incorporated as
supplementary cementing material in the concrete mix as to promote the use of agricultural
waste and create a more sustainable environment besides its own ability to improve strength
development of concrete Next it is also important that to obtain a mix proportion to produce
concrete incorporated with PDFA and studies the mechanical properties of concrete in term of
compressive strength and splitting tensile strength
14 Aim and Objectives
The aim of this research project is to conduct an experimental testing program to determine
the effects of PDFA fineness on the mechanical properties of concrete The objectives of the
research project are
1 To obtain a mix proportion containing different PDFA fineness which can achieve a
targeted strength of 30 Nmm2 at 28 days and slump of 60mm-180mm
II To study the mechanical properties of concr~te by using POFA with 3 different
fineness which are passing through 38wn 631m and 751m
1S Scope of work
The study focuses on the effect of PDFA fineness on the mechanical properties of concrete
The study only limited to test for three types of PDFA fineness which are 381m 631ffi and
3
75JlM with 15 PDFA replacement Three laboratories experimental tests is carried out
namely slump test compressive strength test and splitting tensile strength test The slump test
is carried out to detennine the workability of fresh concrete The concrete sample is cured in
the water and tested for 3 days 7 days and 28 days strength Consequently two mechanical
properties of concrete such as compressive strength and splitting tensile strength will be tested
in this study
16 Thesis Organisation
This report contains five chapters which are introduction literature review methodology
result and discussion and conclusion respectively
Chapter I discuss the general background of the research problem statement scope of work
aim and objectives and thesis significance
Chapter 2 discuss the admixture which is also one of the components of concrete mix Besides
that a general background for four types of pozzolanic materials such as fly ash blast furnace
slag silica fume and rice husk ash will be discussed in this chapter In addition the properties
of PDF A such as physical and chemical composition will also be discussed in this chapter
Moreover a previous study about the effect of PDF A on the mechanical properties of
concrete will be studied Lastly a previous research about the effect of fineness on properties
ofconcrete will be also discussed
Chapter 3 explain various laboratory tests will be carried out in this chapter In this chapter
three laboratory experiments will be conducted such as slump test compressive strength test
and splitting tensile strength test In addition experiment setups will be stated in this chapter
4
r-~-------~-----p~rKhldmat Mak1umat Akauemillt UNIVERSrn MALAYSIA SAltAWAIlt
Chapter 4 generally presents and discusses about the result of each laboratory tests that
conducted in tenn of compressive strength and splitting tensile strength
Chapter 5 conclude the whole study has been conducted A conclusion has been drawn with
relevant objectives stated based on the result achieved from this study Besides that there are
few recommendations will be listed in this chapter
5
CHAPTER 2
LITERATURE REVIEW
21 Introduction
During recent decades there are many researchers have been carried out for the use of
admixture in concrete mixture such as fly ash blast-furnace slag silica fume rice husk ash
and also palm oil fuel ash Besides that the properties of POF A are also briefly discussed and
previous study about the effects of POF A on the mechanical properties of concrete are also
reviewed Lastly previous study about the effects of fineness on the properties of concrete are
also reviewed
22 Admixture
Admixture is used as an additional material which is added to concrete mixtures It is varying
widely in chemical composition from surfactants and soluble salts to polymers and insoluble
minerals The properties of concrete such as workability strength and durability can be
improved by adding admixtures to concrete batch (Monte rio amp Mehta 2006) Besides that
the use of admixture in concrete mixtures may also increase or decrease the cost of concrete
by lowering the required cement content changing the volume of the concrete mixture or
reducing the cost of concrete placing and finishing Thus admixture plays an important role
in concrete mixtures Admixture can be categorised into 2 categorise which is mineral
admixture (fly ash silica fume and others) and chemical admixture (air-entering agents
accelerators water-reducing admixtures However mineral admixtures are more emphasized
in this study and used as supplementary cementitious material for producing concrete
6
Mineral admixtures are categorised into 2 classifications which are natural materials and byshy
product materials Some mineral admixtures can be pozzolanic cementitious and however
others are both cementitious and pozzolanic (Monterio amp Mehta 2006) Natural materials are
defined as a material that has been treated for the only purpose of making a pozzolan
Generally the process involves crushing grinding and size separation occasionally it may
also include thermal activation On the other hand by-product materials are defined as a
material that is not the primary products which produced from industry It mayor may not
require any processing before use as mineral admixtures
However by-product materials are more highlighted in this study Consequently the physiGal
and chemical and mineralogical properties of palm oil fuel ash (PDF A) will be further
discussed in this study Besides that effect of PDF A on the mechanical properties of concrete
will be also discussed in this study
23 Types of Mineral Admixtures from By-product
A variety of by-product materials such as fly ash blast-furnace slag silica fume rice husk ash
and others have been commonly used as pozzolanic materials in concrete The utilization of
pozzolanic material not only enhances the properties of concrete but also protects the
environment
231 Fly Ash
According to Day (2006) fly ash is also known as pulverized fuel ash which is produced from
the combustion of coal in thermal power plants During combustion the mineral impurities
such as clays quartz and feldspar melt in suspension at the high temperature and float out
with the flue gas stream As the fused material rises it is transported to low temperature zones
7
allow it cools and then it solidifies as spherical particles of glass which are called fly ash This
fly ash is collected from the flue gas stream by mechanical separators electrostatic
precipitation or bag filters (Nawy 2008) Fly ash can be categorised into two different types
which are Class C and Class F (ASTM C 618-78) Class C ash is consists of high-calcium fly
ashes with carbon content less than 2 while Class F ash contains low-calcium fly ashes
with carbon content less than 5 but sometimes as high as 10 Class C ash is usually
obtained from burning sub-bituminous or lignite coals whereas Class F ashes are obtained
from burning bituminous or anthracite coals The chemical and physical properties of the ash
have significant impact on the performance properties between Class F and C ashes The
physical properties of fly ashes are depending to the source Fly ash is a fine-grained material
which contains spherical glassy particles The particles can be irregular or angular shapes and
its size is depending on the sources The particles of fly ash may be finer or coarser than
Portland cement particles On the other hand the mineralogical properties of fly ash are
significant influenced by both the type and source of fly ash Fly ash contains noncrystalline
particles or glass and a small quantity of crystalline material as result from the rapid cooling
ofburned coal in the power plant
232 Blast-Furnace Slag
Blast-furnace slag is a by-product of the production of iron (Nawy 2008) When it is quickly
cool down with water to glassy state and finely ground thus the property of latent
hydraulicity will be developed (Nawy 2008) Nowadays the use of blast-furnace slag as an
admixture in concrete is well established In the early 1970s glassy slag was produced by
using pelletizing process which uses much less water than granulation methods Firstly a
treatment with water sprays is used to expand the molten slag and then passed over a rotating
8
fInned drum Lastly the semi molten material is cooled and pelletized by throwing them into
the air
233 SUtea Fume
Silica fume is a byproduct of the production of metallic silicon or ferrosilicon alloys which is
produced by electric arc furnaces (Nawy 2008) The two main components such as the types
of alloy fonned and the composition of quartz and coal are commonly used in the electric arc
furnaces which are significantly influence the chemical composition of silica fume The
majority ofpublished data indicates that the utilization of silica fume in concrete must contain
at least 75 ferro silicon
234 Rice Husk Ash
Rice husk ash is a by-product of the agricultural industry which is produced from burning a
mixture of rice husk and eucalyptus bark by fluidized bed combustion process in a biomass
power plant It consists of high amount of Si02 Silica content in the ash increases with higher
the burning temperature Many researches described that rice husk ash consists of high
reactivity and pozzolanic property after burning process at controlled temperature Chemical
composition of rice husk ash is greatly influenced by the temperature during burning
processes
24 The PbysieaJ Properties of POFA
According to AbdullaH et al (2006) the burning temperature condition is one of factors that
significantly influence the physical properties of POFA Several of physical properties of
9
Wlground and ground POF A used in various studies are shown in Table 21 These all
properties ofunground and ground POFA are briefly discussed below
Table 21 Physical properties of unground and ground POF A (Safiuddin et al 2011)
Properties OPC Unground POFA Ground PO FA
Color Grey Light greywhitish Dark grey
Specific gravity 314-328 178-197 222-278
Median particle size dso(urn) 10-20 543-183 72-101
Passing through 45-urn sieve 56-588 97-99
( mass)
Specific surface area Blaine 314-358 796 882-1244
(m2kg)
Strength activity index () 786-115
SOWldness Le Chatelier 045-1 05-26
expansion (mm)
141 Color
UngroWld POF A is usually in light grey color as results from the unburnt carbon content left
at relatively low burning temperature The content of unburnt carbon becomes very low when
the burning temperature is high Besides that unground POF A can also be whitish color in the
absence of unburnt carbon (Abdullah et al 2006) On the other hand ground POF A is dark
grey color
10
141 Specific Gravity
The specific gravity of unground POFA is normally varies in the range of 178-197 From
Table 21 above it can be seen that the specific gravity of unground POF A is about 40
lower than the specific gravity of ope (Tay 1990) However the specific gravity of POF A is
increased and it is about in the range of 222-278 after the grinding process (Sata et al 2004
Tangchirapat et al 2009) It is because the particle size of POF A is reduced and then the
porosity also decreased as results from grinding processes
143 Particle Shape and Size
The particle shape and size of unground POF A is different as compare to ground POF A It
was found that the particle shape and size are mostly large spherical and porous as shown in
Figure 22 In contrast ground POF A is quite similar to Portland cement which crushed
particle is usually in irregular and angular shape as shown in Figure 21 amp 23 ( Chindaprasirt
et al 2007) The particle size of unground POFA is larger than OPC however the particle
size of ground POF A is smaller than OPe The typical particle size distributions of unground
and ground POF A and ope are shown in Figure 24 The median particle size of unground
POFA is about 543)lm -183)lm which is larger than ope which is in the range of I011m -20
1Jlll However the particle size of POFA is decreased to 72)lffi -lO1)lm after grinding
processes (Sata et al 2004 Chindaprasit et at 2008)
11
Figure 21 OPC (Chindaprasirt et ai 2007) Figure 22 Unground POFA (Jaturapitakkul
et ai 2007)
Figure 23 Ground POFA (Jaturapitakkul et ai 2007)
100 r==III~~iITinTI-1M-7I1
II
rriTiT11 Ground POFA JIl jill
90 ope mill J UOOUnd POFA t++tt+-l~I11H80 III IIT~+IIiI--+++IH
70 ~~t+~~UU~~~I IIIV-J~~U oo ~~U~~~Hm+M~~~I~~~
50 +-+tttlitl t-+-Ii+Itflt-+f+TMIlH-i++IHIt-I+tt+Ilt-i~ 1JlIIlt~ 40 +-r-lliM-=-+WII--l-+4R-++I r-H+fllf-++I I N+-i
~ ~~~I~~~~~J~Ir+~ 2o ~~~~~~~~~~~~~~~I I10 ~~~~~~A~~~_I_I~~~ o 1 w
001 01 10 00 1000 10000
Particle size (~m)
Figure 24 Particle size distribution of un ground and ground POFA and OPC (Sata et ai
2004)
12
234 Rice Husk ash 9
24 The Physical Properties of POF A
241 Color 10
242 Specific gravity 11
243 Particle shape and size 11
244 Fineness 13
25 The Chemical Properties of PO FA 13
26 Effect of PO FA on the Fresh Properties of Concrete
261 Workability 14
27 Effect of PO FA on the Hardened Properties of Concrete
271 Compressive Strength 15
272 Splitting Tensile Strenampth 17
28 Effect of fineness on the Hardened Properties of concrete 18
29 Concluding Remarks 19
CHAPTER 3 METHODOLOGY
31 General 20
32 Material Properties Tests 20
33 Materials Used for Research Project
331 Palm Oil Fuel Ash (POFA) 21
332 Ordinary Portland Cement (OPC) 23
333 Fine Aggregate 23
viii
334 Coarse Aggregate 24
335 Water 25
34 Concrete Mix Proportions
341 Concrete Mixing 26
342 Concrete Casting 27
343 Concrete Curing 27
35 Fresh Concrete Test
351 Slump Test 27
36 Hardened Concrete Tests
361 Compressive Strength Test 27
362 Splitting Tensile Strength Test 28
CHAPTER 4 RESULTS AND DISCUSSION
41 Introduction 29
42 The Effects of PO FA Fineness on Workability of Concrete 29
43 The Effects of PO FA fmeness on Compressive Strength of Concrete 30
44 The Effects of POF A Fineness on Splitting Tensile Strength of Concre 34
CHAPTER 5 CONCLUSIONS AND RECOMMENDA nONS
51 Conclusions 38
52 Recommendations 39
REFERENCES 41
APPENDICES ~ 45
ix
LIST OF TABLES
Table 21 Physical properties ofunground and ground POFA (Safiuddin et aI 2011) 10
Table 22 Chemical composition ofOPC and PO FA (Source Awal 1997 Tangchirapat
Table 23 Effect of POF A on the workability of concrete (Eldagal 2008 Sata et aI 2007
2007 Eldagal 2008) 14
Tay1990) 15
Table 31 Aggregates Properties Laboratory Tests 21
Table 32 Chemical composition of OPC ASTM Type 1 23
Table 33 Physical properties of fine aggregate 23
Table 34 Physical properties of coarse aggregate 24
Table 35 Mix Proportion 26
Table 41 Slump 29
Table 42 Compressive strength for 3 7 and 28 days 31
Table 43 Splitting tensile strength for 3 7 and 28 days 35
x
LIST OF FIGURES
Figure 21 OPC (Chindaprasirt et aI 2007) 12
Figure 24 Particle size distribution ofunground and ground POFA and OPC (Sata et aI
Figure 25 Effect ofunground POFA on the compressive strength of concrete at 28 days (Tay
Figure 26 Effect of ground POF A on the compressive strength at different test ages
Figure 27 Effect of ground POFA on the splitting tensile strength of concrete (Sata et aI
Figure 22 Unground POF A (Jaturapitakkul et aI 2007) 12
Fjgure 23 Ground POFA Jaturapitakkul et aI 2007) 12
2004) 12
1990) 17
(Tangchirapat et aI 2009) 17
2007) 18
Figure 31 POFA 22
Figure 32 Sieved POFA 22
Figure 33 Sieve analysis for sand 24
Figure 34 Sieve analysis for coarse aggregate 25
Figure 41 The Slump 30
Figure 42 Compressive Strength for 3 7 and 28 days 33
Figure 43 Splitting Tensile Strength for 3 7 and 28 days 37
LIST OF APPENDICES
APPENDIX A Processes of Specific Gravity of Coarse Aggregate 45
APPENDIX B Processes of Specific Gravity of Fine Aggreagte 46
APPENDIX C Processes of Concrete Mixing Casting and Curing 48
APPENDIX D Processes of Slump Test 50
APPENDIX E Processes of Compressive Strength Test 51
APPENDIX F Processes of Splitting Tensile Strength Test 52
xii
CHAPTER 1
INTRODUCTION
11 Introduction
Concrete is usually a composite material that is used in civil engineering construction work It
is typically a mixture of cement water aggregate and also other admixtures Concrete is
strong in compression because the aggregate has the ability to carry the compression load
however it is extremely weak in tension
Cement consists of adhesive and cohesive properties which enable it to bond mineral
fragments into a solid mass Cement contains silicates and aluminates of lime which are made
from blended and ground limestone and clay According to Dobrowolski (1998) portland
cement is the most commonly used hydraulic ~ement for making concrete around the world It
is considered as the most significant component of hydraulic cement which hardens due to
hydration a chemical reaction between cement powder and water In concrete design and
quality control strength is the property usually specified The water-cementitious materials
ratio the extent of hydration the curing and environmental conditions are the main factors
that influence the strength of concrete The ultimate compressive strength and rate of strength
development of concrete are also greatly dependent on the chemical and physical properties of
the cement
Higher demands for construction works have contributed to augmentation of cement
production as one of the main components of concrete manufacture As a result the
production of cement leads to increase the concern of global warming as CO2 emission is
released to atmosphere However the variety of studies about various supplementary
1
cementing material involved in concrete production has been conducted in recent years
Nowadays the use of various supplementary cementing materials such as Fly Ash Blastshy
Furnace Slag Silica Fume Rice husk Ash and other fiber and pozzolanic material are gaining
popularity due to increasingly stringent environmental legislation In addition the use of
various supplementary cementing materials is also a common practice since they are
significantly reducing the cement content and improve the ultimate strength of the concrete
In this study the study about the use of Palm Oil Fuel Ash (POF A) as a supplementary
cementing material in concrete production is carried out The influence of POF A and its
degree of fmeness on the mechanical properties of concrete is investigated In Malaysia palm
oil industry is considered as the most important agro industries POF A is a by-product which
is generated from the combustion of palm oil plant residues In this study POF A is used as a
pozzolanic material and also a replacement of cement in concrete to produce cementitious
properties Pozzolan is defined as a siliceous or siliceous and aluminous material where the
particles react with calcium hydroxide from the cement to produce cementitious properties
The utilization of pozzolanic material in concrete would reduce the negative environmental
effect and landfill volume for the disposal of wastes
12 Problem Statement
The presence of palm oil wastes has created a major disposal problem due to a large amount
of solid waste materials is produced such as palm fiber nutshells and empty fruit bunches
from palm oil industry which is burnt at temperatures of about 800-1000 degC as fuels to
provide steam for electricity generation in palm oil mills After the burning process an ash
by-product are obtained which is about 5 by weight of the residues known as palm oil fuel
ash (pOF A) It has been reported that around 4 million tonsyears of POF A are produced in
2
Malaysia only (Zarina 2012) While the quantity of PO FA is rising annually its utilization is
limited and basically disposed of as a waste in landfills without any profitable return It can
also affect environmental problems such as health hazards and financial loss
13 Research Significance
There are several significances in this research project Firstly PDFA is incorporated as
supplementary cementing material in the concrete mix as to promote the use of agricultural
waste and create a more sustainable environment besides its own ability to improve strength
development of concrete Next it is also important that to obtain a mix proportion to produce
concrete incorporated with PDFA and studies the mechanical properties of concrete in term of
compressive strength and splitting tensile strength
14 Aim and Objectives
The aim of this research project is to conduct an experimental testing program to determine
the effects of PDFA fineness on the mechanical properties of concrete The objectives of the
research project are
1 To obtain a mix proportion containing different PDFA fineness which can achieve a
targeted strength of 30 Nmm2 at 28 days and slump of 60mm-180mm
II To study the mechanical properties of concr~te by using POFA with 3 different
fineness which are passing through 38wn 631m and 751m
1S Scope of work
The study focuses on the effect of PDFA fineness on the mechanical properties of concrete
The study only limited to test for three types of PDFA fineness which are 381m 631ffi and
3
75JlM with 15 PDFA replacement Three laboratories experimental tests is carried out
namely slump test compressive strength test and splitting tensile strength test The slump test
is carried out to detennine the workability of fresh concrete The concrete sample is cured in
the water and tested for 3 days 7 days and 28 days strength Consequently two mechanical
properties of concrete such as compressive strength and splitting tensile strength will be tested
in this study
16 Thesis Organisation
This report contains five chapters which are introduction literature review methodology
result and discussion and conclusion respectively
Chapter I discuss the general background of the research problem statement scope of work
aim and objectives and thesis significance
Chapter 2 discuss the admixture which is also one of the components of concrete mix Besides
that a general background for four types of pozzolanic materials such as fly ash blast furnace
slag silica fume and rice husk ash will be discussed in this chapter In addition the properties
of PDF A such as physical and chemical composition will also be discussed in this chapter
Moreover a previous study about the effect of PDF A on the mechanical properties of
concrete will be studied Lastly a previous research about the effect of fineness on properties
ofconcrete will be also discussed
Chapter 3 explain various laboratory tests will be carried out in this chapter In this chapter
three laboratory experiments will be conducted such as slump test compressive strength test
and splitting tensile strength test In addition experiment setups will be stated in this chapter
4
r-~-------~-----p~rKhldmat Mak1umat Akauemillt UNIVERSrn MALAYSIA SAltAWAIlt
Chapter 4 generally presents and discusses about the result of each laboratory tests that
conducted in tenn of compressive strength and splitting tensile strength
Chapter 5 conclude the whole study has been conducted A conclusion has been drawn with
relevant objectives stated based on the result achieved from this study Besides that there are
few recommendations will be listed in this chapter
5
CHAPTER 2
LITERATURE REVIEW
21 Introduction
During recent decades there are many researchers have been carried out for the use of
admixture in concrete mixture such as fly ash blast-furnace slag silica fume rice husk ash
and also palm oil fuel ash Besides that the properties of POF A are also briefly discussed and
previous study about the effects of POF A on the mechanical properties of concrete are also
reviewed Lastly previous study about the effects of fineness on the properties of concrete are
also reviewed
22 Admixture
Admixture is used as an additional material which is added to concrete mixtures It is varying
widely in chemical composition from surfactants and soluble salts to polymers and insoluble
minerals The properties of concrete such as workability strength and durability can be
improved by adding admixtures to concrete batch (Monte rio amp Mehta 2006) Besides that
the use of admixture in concrete mixtures may also increase or decrease the cost of concrete
by lowering the required cement content changing the volume of the concrete mixture or
reducing the cost of concrete placing and finishing Thus admixture plays an important role
in concrete mixtures Admixture can be categorised into 2 categorise which is mineral
admixture (fly ash silica fume and others) and chemical admixture (air-entering agents
accelerators water-reducing admixtures However mineral admixtures are more emphasized
in this study and used as supplementary cementitious material for producing concrete
6
Mineral admixtures are categorised into 2 classifications which are natural materials and byshy
product materials Some mineral admixtures can be pozzolanic cementitious and however
others are both cementitious and pozzolanic (Monterio amp Mehta 2006) Natural materials are
defined as a material that has been treated for the only purpose of making a pozzolan
Generally the process involves crushing grinding and size separation occasionally it may
also include thermal activation On the other hand by-product materials are defined as a
material that is not the primary products which produced from industry It mayor may not
require any processing before use as mineral admixtures
However by-product materials are more highlighted in this study Consequently the physiGal
and chemical and mineralogical properties of palm oil fuel ash (PDF A) will be further
discussed in this study Besides that effect of PDF A on the mechanical properties of concrete
will be also discussed in this study
23 Types of Mineral Admixtures from By-product
A variety of by-product materials such as fly ash blast-furnace slag silica fume rice husk ash
and others have been commonly used as pozzolanic materials in concrete The utilization of
pozzolanic material not only enhances the properties of concrete but also protects the
environment
231 Fly Ash
According to Day (2006) fly ash is also known as pulverized fuel ash which is produced from
the combustion of coal in thermal power plants During combustion the mineral impurities
such as clays quartz and feldspar melt in suspension at the high temperature and float out
with the flue gas stream As the fused material rises it is transported to low temperature zones
7
allow it cools and then it solidifies as spherical particles of glass which are called fly ash This
fly ash is collected from the flue gas stream by mechanical separators electrostatic
precipitation or bag filters (Nawy 2008) Fly ash can be categorised into two different types
which are Class C and Class F (ASTM C 618-78) Class C ash is consists of high-calcium fly
ashes with carbon content less than 2 while Class F ash contains low-calcium fly ashes
with carbon content less than 5 but sometimes as high as 10 Class C ash is usually
obtained from burning sub-bituminous or lignite coals whereas Class F ashes are obtained
from burning bituminous or anthracite coals The chemical and physical properties of the ash
have significant impact on the performance properties between Class F and C ashes The
physical properties of fly ashes are depending to the source Fly ash is a fine-grained material
which contains spherical glassy particles The particles can be irregular or angular shapes and
its size is depending on the sources The particles of fly ash may be finer or coarser than
Portland cement particles On the other hand the mineralogical properties of fly ash are
significant influenced by both the type and source of fly ash Fly ash contains noncrystalline
particles or glass and a small quantity of crystalline material as result from the rapid cooling
ofburned coal in the power plant
232 Blast-Furnace Slag
Blast-furnace slag is a by-product of the production of iron (Nawy 2008) When it is quickly
cool down with water to glassy state and finely ground thus the property of latent
hydraulicity will be developed (Nawy 2008) Nowadays the use of blast-furnace slag as an
admixture in concrete is well established In the early 1970s glassy slag was produced by
using pelletizing process which uses much less water than granulation methods Firstly a
treatment with water sprays is used to expand the molten slag and then passed over a rotating
8
fInned drum Lastly the semi molten material is cooled and pelletized by throwing them into
the air
233 SUtea Fume
Silica fume is a byproduct of the production of metallic silicon or ferrosilicon alloys which is
produced by electric arc furnaces (Nawy 2008) The two main components such as the types
of alloy fonned and the composition of quartz and coal are commonly used in the electric arc
furnaces which are significantly influence the chemical composition of silica fume The
majority ofpublished data indicates that the utilization of silica fume in concrete must contain
at least 75 ferro silicon
234 Rice Husk Ash
Rice husk ash is a by-product of the agricultural industry which is produced from burning a
mixture of rice husk and eucalyptus bark by fluidized bed combustion process in a biomass
power plant It consists of high amount of Si02 Silica content in the ash increases with higher
the burning temperature Many researches described that rice husk ash consists of high
reactivity and pozzolanic property after burning process at controlled temperature Chemical
composition of rice husk ash is greatly influenced by the temperature during burning
processes
24 The PbysieaJ Properties of POFA
According to AbdullaH et al (2006) the burning temperature condition is one of factors that
significantly influence the physical properties of POFA Several of physical properties of
9
Wlground and ground POF A used in various studies are shown in Table 21 These all
properties ofunground and ground POFA are briefly discussed below
Table 21 Physical properties of unground and ground POF A (Safiuddin et al 2011)
Properties OPC Unground POFA Ground PO FA
Color Grey Light greywhitish Dark grey
Specific gravity 314-328 178-197 222-278
Median particle size dso(urn) 10-20 543-183 72-101
Passing through 45-urn sieve 56-588 97-99
( mass)
Specific surface area Blaine 314-358 796 882-1244
(m2kg)
Strength activity index () 786-115
SOWldness Le Chatelier 045-1 05-26
expansion (mm)
141 Color
UngroWld POF A is usually in light grey color as results from the unburnt carbon content left
at relatively low burning temperature The content of unburnt carbon becomes very low when
the burning temperature is high Besides that unground POF A can also be whitish color in the
absence of unburnt carbon (Abdullah et al 2006) On the other hand ground POF A is dark
grey color
10
141 Specific Gravity
The specific gravity of unground POFA is normally varies in the range of 178-197 From
Table 21 above it can be seen that the specific gravity of unground POF A is about 40
lower than the specific gravity of ope (Tay 1990) However the specific gravity of POF A is
increased and it is about in the range of 222-278 after the grinding process (Sata et al 2004
Tangchirapat et al 2009) It is because the particle size of POF A is reduced and then the
porosity also decreased as results from grinding processes
143 Particle Shape and Size
The particle shape and size of unground POF A is different as compare to ground POF A It
was found that the particle shape and size are mostly large spherical and porous as shown in
Figure 22 In contrast ground POF A is quite similar to Portland cement which crushed
particle is usually in irregular and angular shape as shown in Figure 21 amp 23 ( Chindaprasirt
et al 2007) The particle size of unground POFA is larger than OPC however the particle
size of ground POF A is smaller than OPe The typical particle size distributions of unground
and ground POF A and ope are shown in Figure 24 The median particle size of unground
POFA is about 543)lm -183)lm which is larger than ope which is in the range of I011m -20
1Jlll However the particle size of POFA is decreased to 72)lffi -lO1)lm after grinding
processes (Sata et al 2004 Chindaprasit et at 2008)
11
Figure 21 OPC (Chindaprasirt et ai 2007) Figure 22 Unground POFA (Jaturapitakkul
et ai 2007)
Figure 23 Ground POFA (Jaturapitakkul et ai 2007)
100 r==III~~iITinTI-1M-7I1
II
rriTiT11 Ground POFA JIl jill
90 ope mill J UOOUnd POFA t++tt+-l~I11H80 III IIT~+IIiI--+++IH
70 ~~t+~~UU~~~I IIIV-J~~U oo ~~U~~~Hm+M~~~I~~~
50 +-+tttlitl t-+-Ii+Itflt-+f+TMIlH-i++IHIt-I+tt+Ilt-i~ 1JlIIlt~ 40 +-r-lliM-=-+WII--l-+4R-++I r-H+fllf-++I I N+-i
~ ~~~I~~~~~J~Ir+~ 2o ~~~~~~~~~~~~~~~I I10 ~~~~~~A~~~_I_I~~~ o 1 w
001 01 10 00 1000 10000
Particle size (~m)
Figure 24 Particle size distribution of un ground and ground POFA and OPC (Sata et ai
2004)
12
334 Coarse Aggregate 24
335 Water 25
34 Concrete Mix Proportions
341 Concrete Mixing 26
342 Concrete Casting 27
343 Concrete Curing 27
35 Fresh Concrete Test
351 Slump Test 27
36 Hardened Concrete Tests
361 Compressive Strength Test 27
362 Splitting Tensile Strength Test 28
CHAPTER 4 RESULTS AND DISCUSSION
41 Introduction 29
42 The Effects of PO FA Fineness on Workability of Concrete 29
43 The Effects of PO FA fmeness on Compressive Strength of Concrete 30
44 The Effects of POF A Fineness on Splitting Tensile Strength of Concre 34
CHAPTER 5 CONCLUSIONS AND RECOMMENDA nONS
51 Conclusions 38
52 Recommendations 39
REFERENCES 41
APPENDICES ~ 45
ix
LIST OF TABLES
Table 21 Physical properties ofunground and ground POFA (Safiuddin et aI 2011) 10
Table 22 Chemical composition ofOPC and PO FA (Source Awal 1997 Tangchirapat
Table 23 Effect of POF A on the workability of concrete (Eldagal 2008 Sata et aI 2007
2007 Eldagal 2008) 14
Tay1990) 15
Table 31 Aggregates Properties Laboratory Tests 21
Table 32 Chemical composition of OPC ASTM Type 1 23
Table 33 Physical properties of fine aggregate 23
Table 34 Physical properties of coarse aggregate 24
Table 35 Mix Proportion 26
Table 41 Slump 29
Table 42 Compressive strength for 3 7 and 28 days 31
Table 43 Splitting tensile strength for 3 7 and 28 days 35
x
LIST OF FIGURES
Figure 21 OPC (Chindaprasirt et aI 2007) 12
Figure 24 Particle size distribution ofunground and ground POFA and OPC (Sata et aI
Figure 25 Effect ofunground POFA on the compressive strength of concrete at 28 days (Tay
Figure 26 Effect of ground POF A on the compressive strength at different test ages
Figure 27 Effect of ground POFA on the splitting tensile strength of concrete (Sata et aI
Figure 22 Unground POF A (Jaturapitakkul et aI 2007) 12
Fjgure 23 Ground POFA Jaturapitakkul et aI 2007) 12
2004) 12
1990) 17
(Tangchirapat et aI 2009) 17
2007) 18
Figure 31 POFA 22
Figure 32 Sieved POFA 22
Figure 33 Sieve analysis for sand 24
Figure 34 Sieve analysis for coarse aggregate 25
Figure 41 The Slump 30
Figure 42 Compressive Strength for 3 7 and 28 days 33
Figure 43 Splitting Tensile Strength for 3 7 and 28 days 37
LIST OF APPENDICES
APPENDIX A Processes of Specific Gravity of Coarse Aggregate 45
APPENDIX B Processes of Specific Gravity of Fine Aggreagte 46
APPENDIX C Processes of Concrete Mixing Casting and Curing 48
APPENDIX D Processes of Slump Test 50
APPENDIX E Processes of Compressive Strength Test 51
APPENDIX F Processes of Splitting Tensile Strength Test 52
xii
CHAPTER 1
INTRODUCTION
11 Introduction
Concrete is usually a composite material that is used in civil engineering construction work It
is typically a mixture of cement water aggregate and also other admixtures Concrete is
strong in compression because the aggregate has the ability to carry the compression load
however it is extremely weak in tension
Cement consists of adhesive and cohesive properties which enable it to bond mineral
fragments into a solid mass Cement contains silicates and aluminates of lime which are made
from blended and ground limestone and clay According to Dobrowolski (1998) portland
cement is the most commonly used hydraulic ~ement for making concrete around the world It
is considered as the most significant component of hydraulic cement which hardens due to
hydration a chemical reaction between cement powder and water In concrete design and
quality control strength is the property usually specified The water-cementitious materials
ratio the extent of hydration the curing and environmental conditions are the main factors
that influence the strength of concrete The ultimate compressive strength and rate of strength
development of concrete are also greatly dependent on the chemical and physical properties of
the cement
Higher demands for construction works have contributed to augmentation of cement
production as one of the main components of concrete manufacture As a result the
production of cement leads to increase the concern of global warming as CO2 emission is
released to atmosphere However the variety of studies about various supplementary
1
cementing material involved in concrete production has been conducted in recent years
Nowadays the use of various supplementary cementing materials such as Fly Ash Blastshy
Furnace Slag Silica Fume Rice husk Ash and other fiber and pozzolanic material are gaining
popularity due to increasingly stringent environmental legislation In addition the use of
various supplementary cementing materials is also a common practice since they are
significantly reducing the cement content and improve the ultimate strength of the concrete
In this study the study about the use of Palm Oil Fuel Ash (POF A) as a supplementary
cementing material in concrete production is carried out The influence of POF A and its
degree of fmeness on the mechanical properties of concrete is investigated In Malaysia palm
oil industry is considered as the most important agro industries POF A is a by-product which
is generated from the combustion of palm oil plant residues In this study POF A is used as a
pozzolanic material and also a replacement of cement in concrete to produce cementitious
properties Pozzolan is defined as a siliceous or siliceous and aluminous material where the
particles react with calcium hydroxide from the cement to produce cementitious properties
The utilization of pozzolanic material in concrete would reduce the negative environmental
effect and landfill volume for the disposal of wastes
12 Problem Statement
The presence of palm oil wastes has created a major disposal problem due to a large amount
of solid waste materials is produced such as palm fiber nutshells and empty fruit bunches
from palm oil industry which is burnt at temperatures of about 800-1000 degC as fuels to
provide steam for electricity generation in palm oil mills After the burning process an ash
by-product are obtained which is about 5 by weight of the residues known as palm oil fuel
ash (pOF A) It has been reported that around 4 million tonsyears of POF A are produced in
2
Malaysia only (Zarina 2012) While the quantity of PO FA is rising annually its utilization is
limited and basically disposed of as a waste in landfills without any profitable return It can
also affect environmental problems such as health hazards and financial loss
13 Research Significance
There are several significances in this research project Firstly PDFA is incorporated as
supplementary cementing material in the concrete mix as to promote the use of agricultural
waste and create a more sustainable environment besides its own ability to improve strength
development of concrete Next it is also important that to obtain a mix proportion to produce
concrete incorporated with PDFA and studies the mechanical properties of concrete in term of
compressive strength and splitting tensile strength
14 Aim and Objectives
The aim of this research project is to conduct an experimental testing program to determine
the effects of PDFA fineness on the mechanical properties of concrete The objectives of the
research project are
1 To obtain a mix proportion containing different PDFA fineness which can achieve a
targeted strength of 30 Nmm2 at 28 days and slump of 60mm-180mm
II To study the mechanical properties of concr~te by using POFA with 3 different
fineness which are passing through 38wn 631m and 751m
1S Scope of work
The study focuses on the effect of PDFA fineness on the mechanical properties of concrete
The study only limited to test for three types of PDFA fineness which are 381m 631ffi and
3
75JlM with 15 PDFA replacement Three laboratories experimental tests is carried out
namely slump test compressive strength test and splitting tensile strength test The slump test
is carried out to detennine the workability of fresh concrete The concrete sample is cured in
the water and tested for 3 days 7 days and 28 days strength Consequently two mechanical
properties of concrete such as compressive strength and splitting tensile strength will be tested
in this study
16 Thesis Organisation
This report contains five chapters which are introduction literature review methodology
result and discussion and conclusion respectively
Chapter I discuss the general background of the research problem statement scope of work
aim and objectives and thesis significance
Chapter 2 discuss the admixture which is also one of the components of concrete mix Besides
that a general background for four types of pozzolanic materials such as fly ash blast furnace
slag silica fume and rice husk ash will be discussed in this chapter In addition the properties
of PDF A such as physical and chemical composition will also be discussed in this chapter
Moreover a previous study about the effect of PDF A on the mechanical properties of
concrete will be studied Lastly a previous research about the effect of fineness on properties
ofconcrete will be also discussed
Chapter 3 explain various laboratory tests will be carried out in this chapter In this chapter
three laboratory experiments will be conducted such as slump test compressive strength test
and splitting tensile strength test In addition experiment setups will be stated in this chapter
4
r-~-------~-----p~rKhldmat Mak1umat Akauemillt UNIVERSrn MALAYSIA SAltAWAIlt
Chapter 4 generally presents and discusses about the result of each laboratory tests that
conducted in tenn of compressive strength and splitting tensile strength
Chapter 5 conclude the whole study has been conducted A conclusion has been drawn with
relevant objectives stated based on the result achieved from this study Besides that there are
few recommendations will be listed in this chapter
5
CHAPTER 2
LITERATURE REVIEW
21 Introduction
During recent decades there are many researchers have been carried out for the use of
admixture in concrete mixture such as fly ash blast-furnace slag silica fume rice husk ash
and also palm oil fuel ash Besides that the properties of POF A are also briefly discussed and
previous study about the effects of POF A on the mechanical properties of concrete are also
reviewed Lastly previous study about the effects of fineness on the properties of concrete are
also reviewed
22 Admixture
Admixture is used as an additional material which is added to concrete mixtures It is varying
widely in chemical composition from surfactants and soluble salts to polymers and insoluble
minerals The properties of concrete such as workability strength and durability can be
improved by adding admixtures to concrete batch (Monte rio amp Mehta 2006) Besides that
the use of admixture in concrete mixtures may also increase or decrease the cost of concrete
by lowering the required cement content changing the volume of the concrete mixture or
reducing the cost of concrete placing and finishing Thus admixture plays an important role
in concrete mixtures Admixture can be categorised into 2 categorise which is mineral
admixture (fly ash silica fume and others) and chemical admixture (air-entering agents
accelerators water-reducing admixtures However mineral admixtures are more emphasized
in this study and used as supplementary cementitious material for producing concrete
6
Mineral admixtures are categorised into 2 classifications which are natural materials and byshy
product materials Some mineral admixtures can be pozzolanic cementitious and however
others are both cementitious and pozzolanic (Monterio amp Mehta 2006) Natural materials are
defined as a material that has been treated for the only purpose of making a pozzolan
Generally the process involves crushing grinding and size separation occasionally it may
also include thermal activation On the other hand by-product materials are defined as a
material that is not the primary products which produced from industry It mayor may not
require any processing before use as mineral admixtures
However by-product materials are more highlighted in this study Consequently the physiGal
and chemical and mineralogical properties of palm oil fuel ash (PDF A) will be further
discussed in this study Besides that effect of PDF A on the mechanical properties of concrete
will be also discussed in this study
23 Types of Mineral Admixtures from By-product
A variety of by-product materials such as fly ash blast-furnace slag silica fume rice husk ash
and others have been commonly used as pozzolanic materials in concrete The utilization of
pozzolanic material not only enhances the properties of concrete but also protects the
environment
231 Fly Ash
According to Day (2006) fly ash is also known as pulverized fuel ash which is produced from
the combustion of coal in thermal power plants During combustion the mineral impurities
such as clays quartz and feldspar melt in suspension at the high temperature and float out
with the flue gas stream As the fused material rises it is transported to low temperature zones
7
allow it cools and then it solidifies as spherical particles of glass which are called fly ash This
fly ash is collected from the flue gas stream by mechanical separators electrostatic
precipitation or bag filters (Nawy 2008) Fly ash can be categorised into two different types
which are Class C and Class F (ASTM C 618-78) Class C ash is consists of high-calcium fly
ashes with carbon content less than 2 while Class F ash contains low-calcium fly ashes
with carbon content less than 5 but sometimes as high as 10 Class C ash is usually
obtained from burning sub-bituminous or lignite coals whereas Class F ashes are obtained
from burning bituminous or anthracite coals The chemical and physical properties of the ash
have significant impact on the performance properties between Class F and C ashes The
physical properties of fly ashes are depending to the source Fly ash is a fine-grained material
which contains spherical glassy particles The particles can be irregular or angular shapes and
its size is depending on the sources The particles of fly ash may be finer or coarser than
Portland cement particles On the other hand the mineralogical properties of fly ash are
significant influenced by both the type and source of fly ash Fly ash contains noncrystalline
particles or glass and a small quantity of crystalline material as result from the rapid cooling
ofburned coal in the power plant
232 Blast-Furnace Slag
Blast-furnace slag is a by-product of the production of iron (Nawy 2008) When it is quickly
cool down with water to glassy state and finely ground thus the property of latent
hydraulicity will be developed (Nawy 2008) Nowadays the use of blast-furnace slag as an
admixture in concrete is well established In the early 1970s glassy slag was produced by
using pelletizing process which uses much less water than granulation methods Firstly a
treatment with water sprays is used to expand the molten slag and then passed over a rotating
8
fInned drum Lastly the semi molten material is cooled and pelletized by throwing them into
the air
233 SUtea Fume
Silica fume is a byproduct of the production of metallic silicon or ferrosilicon alloys which is
produced by electric arc furnaces (Nawy 2008) The two main components such as the types
of alloy fonned and the composition of quartz and coal are commonly used in the electric arc
furnaces which are significantly influence the chemical composition of silica fume The
majority ofpublished data indicates that the utilization of silica fume in concrete must contain
at least 75 ferro silicon
234 Rice Husk Ash
Rice husk ash is a by-product of the agricultural industry which is produced from burning a
mixture of rice husk and eucalyptus bark by fluidized bed combustion process in a biomass
power plant It consists of high amount of Si02 Silica content in the ash increases with higher
the burning temperature Many researches described that rice husk ash consists of high
reactivity and pozzolanic property after burning process at controlled temperature Chemical
composition of rice husk ash is greatly influenced by the temperature during burning
processes
24 The PbysieaJ Properties of POFA
According to AbdullaH et al (2006) the burning temperature condition is one of factors that
significantly influence the physical properties of POFA Several of physical properties of
9
Wlground and ground POF A used in various studies are shown in Table 21 These all
properties ofunground and ground POFA are briefly discussed below
Table 21 Physical properties of unground and ground POF A (Safiuddin et al 2011)
Properties OPC Unground POFA Ground PO FA
Color Grey Light greywhitish Dark grey
Specific gravity 314-328 178-197 222-278
Median particle size dso(urn) 10-20 543-183 72-101
Passing through 45-urn sieve 56-588 97-99
( mass)
Specific surface area Blaine 314-358 796 882-1244
(m2kg)
Strength activity index () 786-115
SOWldness Le Chatelier 045-1 05-26
expansion (mm)
141 Color
UngroWld POF A is usually in light grey color as results from the unburnt carbon content left
at relatively low burning temperature The content of unburnt carbon becomes very low when
the burning temperature is high Besides that unground POF A can also be whitish color in the
absence of unburnt carbon (Abdullah et al 2006) On the other hand ground POF A is dark
grey color
10
141 Specific Gravity
The specific gravity of unground POFA is normally varies in the range of 178-197 From
Table 21 above it can be seen that the specific gravity of unground POF A is about 40
lower than the specific gravity of ope (Tay 1990) However the specific gravity of POF A is
increased and it is about in the range of 222-278 after the grinding process (Sata et al 2004
Tangchirapat et al 2009) It is because the particle size of POF A is reduced and then the
porosity also decreased as results from grinding processes
143 Particle Shape and Size
The particle shape and size of unground POF A is different as compare to ground POF A It
was found that the particle shape and size are mostly large spherical and porous as shown in
Figure 22 In contrast ground POF A is quite similar to Portland cement which crushed
particle is usually in irregular and angular shape as shown in Figure 21 amp 23 ( Chindaprasirt
et al 2007) The particle size of unground POFA is larger than OPC however the particle
size of ground POF A is smaller than OPe The typical particle size distributions of unground
and ground POF A and ope are shown in Figure 24 The median particle size of unground
POFA is about 543)lm -183)lm which is larger than ope which is in the range of I011m -20
1Jlll However the particle size of POFA is decreased to 72)lffi -lO1)lm after grinding
processes (Sata et al 2004 Chindaprasit et at 2008)
11
Figure 21 OPC (Chindaprasirt et ai 2007) Figure 22 Unground POFA (Jaturapitakkul
et ai 2007)
Figure 23 Ground POFA (Jaturapitakkul et ai 2007)
100 r==III~~iITinTI-1M-7I1
II
rriTiT11 Ground POFA JIl jill
90 ope mill J UOOUnd POFA t++tt+-l~I11H80 III IIT~+IIiI--+++IH
70 ~~t+~~UU~~~I IIIV-J~~U oo ~~U~~~Hm+M~~~I~~~
50 +-+tttlitl t-+-Ii+Itflt-+f+TMIlH-i++IHIt-I+tt+Ilt-i~ 1JlIIlt~ 40 +-r-lliM-=-+WII--l-+4R-++I r-H+fllf-++I I N+-i
~ ~~~I~~~~~J~Ir+~ 2o ~~~~~~~~~~~~~~~I I10 ~~~~~~A~~~_I_I~~~ o 1 w
001 01 10 00 1000 10000
Particle size (~m)
Figure 24 Particle size distribution of un ground and ground POFA and OPC (Sata et ai
2004)
12
LIST OF TABLES
Table 21 Physical properties ofunground and ground POFA (Safiuddin et aI 2011) 10
Table 22 Chemical composition ofOPC and PO FA (Source Awal 1997 Tangchirapat
Table 23 Effect of POF A on the workability of concrete (Eldagal 2008 Sata et aI 2007
2007 Eldagal 2008) 14
Tay1990) 15
Table 31 Aggregates Properties Laboratory Tests 21
Table 32 Chemical composition of OPC ASTM Type 1 23
Table 33 Physical properties of fine aggregate 23
Table 34 Physical properties of coarse aggregate 24
Table 35 Mix Proportion 26
Table 41 Slump 29
Table 42 Compressive strength for 3 7 and 28 days 31
Table 43 Splitting tensile strength for 3 7 and 28 days 35
x
LIST OF FIGURES
Figure 21 OPC (Chindaprasirt et aI 2007) 12
Figure 24 Particle size distribution ofunground and ground POFA and OPC (Sata et aI
Figure 25 Effect ofunground POFA on the compressive strength of concrete at 28 days (Tay
Figure 26 Effect of ground POF A on the compressive strength at different test ages
Figure 27 Effect of ground POFA on the splitting tensile strength of concrete (Sata et aI
Figure 22 Unground POF A (Jaturapitakkul et aI 2007) 12
Fjgure 23 Ground POFA Jaturapitakkul et aI 2007) 12
2004) 12
1990) 17
(Tangchirapat et aI 2009) 17
2007) 18
Figure 31 POFA 22
Figure 32 Sieved POFA 22
Figure 33 Sieve analysis for sand 24
Figure 34 Sieve analysis for coarse aggregate 25
Figure 41 The Slump 30
Figure 42 Compressive Strength for 3 7 and 28 days 33
Figure 43 Splitting Tensile Strength for 3 7 and 28 days 37
LIST OF APPENDICES
APPENDIX A Processes of Specific Gravity of Coarse Aggregate 45
APPENDIX B Processes of Specific Gravity of Fine Aggreagte 46
APPENDIX C Processes of Concrete Mixing Casting and Curing 48
APPENDIX D Processes of Slump Test 50
APPENDIX E Processes of Compressive Strength Test 51
APPENDIX F Processes of Splitting Tensile Strength Test 52
xii
CHAPTER 1
INTRODUCTION
11 Introduction
Concrete is usually a composite material that is used in civil engineering construction work It
is typically a mixture of cement water aggregate and also other admixtures Concrete is
strong in compression because the aggregate has the ability to carry the compression load
however it is extremely weak in tension
Cement consists of adhesive and cohesive properties which enable it to bond mineral
fragments into a solid mass Cement contains silicates and aluminates of lime which are made
from blended and ground limestone and clay According to Dobrowolski (1998) portland
cement is the most commonly used hydraulic ~ement for making concrete around the world It
is considered as the most significant component of hydraulic cement which hardens due to
hydration a chemical reaction between cement powder and water In concrete design and
quality control strength is the property usually specified The water-cementitious materials
ratio the extent of hydration the curing and environmental conditions are the main factors
that influence the strength of concrete The ultimate compressive strength and rate of strength
development of concrete are also greatly dependent on the chemical and physical properties of
the cement
Higher demands for construction works have contributed to augmentation of cement
production as one of the main components of concrete manufacture As a result the
production of cement leads to increase the concern of global warming as CO2 emission is
released to atmosphere However the variety of studies about various supplementary
1
cementing material involved in concrete production has been conducted in recent years
Nowadays the use of various supplementary cementing materials such as Fly Ash Blastshy
Furnace Slag Silica Fume Rice husk Ash and other fiber and pozzolanic material are gaining
popularity due to increasingly stringent environmental legislation In addition the use of
various supplementary cementing materials is also a common practice since they are
significantly reducing the cement content and improve the ultimate strength of the concrete
In this study the study about the use of Palm Oil Fuel Ash (POF A) as a supplementary
cementing material in concrete production is carried out The influence of POF A and its
degree of fmeness on the mechanical properties of concrete is investigated In Malaysia palm
oil industry is considered as the most important agro industries POF A is a by-product which
is generated from the combustion of palm oil plant residues In this study POF A is used as a
pozzolanic material and also a replacement of cement in concrete to produce cementitious
properties Pozzolan is defined as a siliceous or siliceous and aluminous material where the
particles react with calcium hydroxide from the cement to produce cementitious properties
The utilization of pozzolanic material in concrete would reduce the negative environmental
effect and landfill volume for the disposal of wastes
12 Problem Statement
The presence of palm oil wastes has created a major disposal problem due to a large amount
of solid waste materials is produced such as palm fiber nutshells and empty fruit bunches
from palm oil industry which is burnt at temperatures of about 800-1000 degC as fuels to
provide steam for electricity generation in palm oil mills After the burning process an ash
by-product are obtained which is about 5 by weight of the residues known as palm oil fuel
ash (pOF A) It has been reported that around 4 million tonsyears of POF A are produced in
2
Malaysia only (Zarina 2012) While the quantity of PO FA is rising annually its utilization is
limited and basically disposed of as a waste in landfills without any profitable return It can
also affect environmental problems such as health hazards and financial loss
13 Research Significance
There are several significances in this research project Firstly PDFA is incorporated as
supplementary cementing material in the concrete mix as to promote the use of agricultural
waste and create a more sustainable environment besides its own ability to improve strength
development of concrete Next it is also important that to obtain a mix proportion to produce
concrete incorporated with PDFA and studies the mechanical properties of concrete in term of
compressive strength and splitting tensile strength
14 Aim and Objectives
The aim of this research project is to conduct an experimental testing program to determine
the effects of PDFA fineness on the mechanical properties of concrete The objectives of the
research project are
1 To obtain a mix proportion containing different PDFA fineness which can achieve a
targeted strength of 30 Nmm2 at 28 days and slump of 60mm-180mm
II To study the mechanical properties of concr~te by using POFA with 3 different
fineness which are passing through 38wn 631m and 751m
1S Scope of work
The study focuses on the effect of PDFA fineness on the mechanical properties of concrete
The study only limited to test for three types of PDFA fineness which are 381m 631ffi and
3
75JlM with 15 PDFA replacement Three laboratories experimental tests is carried out
namely slump test compressive strength test and splitting tensile strength test The slump test
is carried out to detennine the workability of fresh concrete The concrete sample is cured in
the water and tested for 3 days 7 days and 28 days strength Consequently two mechanical
properties of concrete such as compressive strength and splitting tensile strength will be tested
in this study
16 Thesis Organisation
This report contains five chapters which are introduction literature review methodology
result and discussion and conclusion respectively
Chapter I discuss the general background of the research problem statement scope of work
aim and objectives and thesis significance
Chapter 2 discuss the admixture which is also one of the components of concrete mix Besides
that a general background for four types of pozzolanic materials such as fly ash blast furnace
slag silica fume and rice husk ash will be discussed in this chapter In addition the properties
of PDF A such as physical and chemical composition will also be discussed in this chapter
Moreover a previous study about the effect of PDF A on the mechanical properties of
concrete will be studied Lastly a previous research about the effect of fineness on properties
ofconcrete will be also discussed
Chapter 3 explain various laboratory tests will be carried out in this chapter In this chapter
three laboratory experiments will be conducted such as slump test compressive strength test
and splitting tensile strength test In addition experiment setups will be stated in this chapter
4
r-~-------~-----p~rKhldmat Mak1umat Akauemillt UNIVERSrn MALAYSIA SAltAWAIlt
Chapter 4 generally presents and discusses about the result of each laboratory tests that
conducted in tenn of compressive strength and splitting tensile strength
Chapter 5 conclude the whole study has been conducted A conclusion has been drawn with
relevant objectives stated based on the result achieved from this study Besides that there are
few recommendations will be listed in this chapter
5
CHAPTER 2
LITERATURE REVIEW
21 Introduction
During recent decades there are many researchers have been carried out for the use of
admixture in concrete mixture such as fly ash blast-furnace slag silica fume rice husk ash
and also palm oil fuel ash Besides that the properties of POF A are also briefly discussed and
previous study about the effects of POF A on the mechanical properties of concrete are also
reviewed Lastly previous study about the effects of fineness on the properties of concrete are
also reviewed
22 Admixture
Admixture is used as an additional material which is added to concrete mixtures It is varying
widely in chemical composition from surfactants and soluble salts to polymers and insoluble
minerals The properties of concrete such as workability strength and durability can be
improved by adding admixtures to concrete batch (Monte rio amp Mehta 2006) Besides that
the use of admixture in concrete mixtures may also increase or decrease the cost of concrete
by lowering the required cement content changing the volume of the concrete mixture or
reducing the cost of concrete placing and finishing Thus admixture plays an important role
in concrete mixtures Admixture can be categorised into 2 categorise which is mineral
admixture (fly ash silica fume and others) and chemical admixture (air-entering agents
accelerators water-reducing admixtures However mineral admixtures are more emphasized
in this study and used as supplementary cementitious material for producing concrete
6
Mineral admixtures are categorised into 2 classifications which are natural materials and byshy
product materials Some mineral admixtures can be pozzolanic cementitious and however
others are both cementitious and pozzolanic (Monterio amp Mehta 2006) Natural materials are
defined as a material that has been treated for the only purpose of making a pozzolan
Generally the process involves crushing grinding and size separation occasionally it may
also include thermal activation On the other hand by-product materials are defined as a
material that is not the primary products which produced from industry It mayor may not
require any processing before use as mineral admixtures
However by-product materials are more highlighted in this study Consequently the physiGal
and chemical and mineralogical properties of palm oil fuel ash (PDF A) will be further
discussed in this study Besides that effect of PDF A on the mechanical properties of concrete
will be also discussed in this study
23 Types of Mineral Admixtures from By-product
A variety of by-product materials such as fly ash blast-furnace slag silica fume rice husk ash
and others have been commonly used as pozzolanic materials in concrete The utilization of
pozzolanic material not only enhances the properties of concrete but also protects the
environment
231 Fly Ash
According to Day (2006) fly ash is also known as pulverized fuel ash which is produced from
the combustion of coal in thermal power plants During combustion the mineral impurities
such as clays quartz and feldspar melt in suspension at the high temperature and float out
with the flue gas stream As the fused material rises it is transported to low temperature zones
7
allow it cools and then it solidifies as spherical particles of glass which are called fly ash This
fly ash is collected from the flue gas stream by mechanical separators electrostatic
precipitation or bag filters (Nawy 2008) Fly ash can be categorised into two different types
which are Class C and Class F (ASTM C 618-78) Class C ash is consists of high-calcium fly
ashes with carbon content less than 2 while Class F ash contains low-calcium fly ashes
with carbon content less than 5 but sometimes as high as 10 Class C ash is usually
obtained from burning sub-bituminous or lignite coals whereas Class F ashes are obtained
from burning bituminous or anthracite coals The chemical and physical properties of the ash
have significant impact on the performance properties between Class F and C ashes The
physical properties of fly ashes are depending to the source Fly ash is a fine-grained material
which contains spherical glassy particles The particles can be irregular or angular shapes and
its size is depending on the sources The particles of fly ash may be finer or coarser than
Portland cement particles On the other hand the mineralogical properties of fly ash are
significant influenced by both the type and source of fly ash Fly ash contains noncrystalline
particles or glass and a small quantity of crystalline material as result from the rapid cooling
ofburned coal in the power plant
232 Blast-Furnace Slag
Blast-furnace slag is a by-product of the production of iron (Nawy 2008) When it is quickly
cool down with water to glassy state and finely ground thus the property of latent
hydraulicity will be developed (Nawy 2008) Nowadays the use of blast-furnace slag as an
admixture in concrete is well established In the early 1970s glassy slag was produced by
using pelletizing process which uses much less water than granulation methods Firstly a
treatment with water sprays is used to expand the molten slag and then passed over a rotating
8
fInned drum Lastly the semi molten material is cooled and pelletized by throwing them into
the air
233 SUtea Fume
Silica fume is a byproduct of the production of metallic silicon or ferrosilicon alloys which is
produced by electric arc furnaces (Nawy 2008) The two main components such as the types
of alloy fonned and the composition of quartz and coal are commonly used in the electric arc
furnaces which are significantly influence the chemical composition of silica fume The
majority ofpublished data indicates that the utilization of silica fume in concrete must contain
at least 75 ferro silicon
234 Rice Husk Ash
Rice husk ash is a by-product of the agricultural industry which is produced from burning a
mixture of rice husk and eucalyptus bark by fluidized bed combustion process in a biomass
power plant It consists of high amount of Si02 Silica content in the ash increases with higher
the burning temperature Many researches described that rice husk ash consists of high
reactivity and pozzolanic property after burning process at controlled temperature Chemical
composition of rice husk ash is greatly influenced by the temperature during burning
processes
24 The PbysieaJ Properties of POFA
According to AbdullaH et al (2006) the burning temperature condition is one of factors that
significantly influence the physical properties of POFA Several of physical properties of
9
Wlground and ground POF A used in various studies are shown in Table 21 These all
properties ofunground and ground POFA are briefly discussed below
Table 21 Physical properties of unground and ground POF A (Safiuddin et al 2011)
Properties OPC Unground POFA Ground PO FA
Color Grey Light greywhitish Dark grey
Specific gravity 314-328 178-197 222-278
Median particle size dso(urn) 10-20 543-183 72-101
Passing through 45-urn sieve 56-588 97-99
( mass)
Specific surface area Blaine 314-358 796 882-1244
(m2kg)
Strength activity index () 786-115
SOWldness Le Chatelier 045-1 05-26
expansion (mm)
141 Color
UngroWld POF A is usually in light grey color as results from the unburnt carbon content left
at relatively low burning temperature The content of unburnt carbon becomes very low when
the burning temperature is high Besides that unground POF A can also be whitish color in the
absence of unburnt carbon (Abdullah et al 2006) On the other hand ground POF A is dark
grey color
10
141 Specific Gravity
The specific gravity of unground POFA is normally varies in the range of 178-197 From
Table 21 above it can be seen that the specific gravity of unground POF A is about 40
lower than the specific gravity of ope (Tay 1990) However the specific gravity of POF A is
increased and it is about in the range of 222-278 after the grinding process (Sata et al 2004
Tangchirapat et al 2009) It is because the particle size of POF A is reduced and then the
porosity also decreased as results from grinding processes
143 Particle Shape and Size
The particle shape and size of unground POF A is different as compare to ground POF A It
was found that the particle shape and size are mostly large spherical and porous as shown in
Figure 22 In contrast ground POF A is quite similar to Portland cement which crushed
particle is usually in irregular and angular shape as shown in Figure 21 amp 23 ( Chindaprasirt
et al 2007) The particle size of unground POFA is larger than OPC however the particle
size of ground POF A is smaller than OPe The typical particle size distributions of unground
and ground POF A and ope are shown in Figure 24 The median particle size of unground
POFA is about 543)lm -183)lm which is larger than ope which is in the range of I011m -20
1Jlll However the particle size of POFA is decreased to 72)lffi -lO1)lm after grinding
processes (Sata et al 2004 Chindaprasit et at 2008)
11
Figure 21 OPC (Chindaprasirt et ai 2007) Figure 22 Unground POFA (Jaturapitakkul
et ai 2007)
Figure 23 Ground POFA (Jaturapitakkul et ai 2007)
100 r==III~~iITinTI-1M-7I1
II
rriTiT11 Ground POFA JIl jill
90 ope mill J UOOUnd POFA t++tt+-l~I11H80 III IIT~+IIiI--+++IH
70 ~~t+~~UU~~~I IIIV-J~~U oo ~~U~~~Hm+M~~~I~~~
50 +-+tttlitl t-+-Ii+Itflt-+f+TMIlH-i++IHIt-I+tt+Ilt-i~ 1JlIIlt~ 40 +-r-lliM-=-+WII--l-+4R-++I r-H+fllf-++I I N+-i
~ ~~~I~~~~~J~Ir+~ 2o ~~~~~~~~~~~~~~~I I10 ~~~~~~A~~~_I_I~~~ o 1 w
001 01 10 00 1000 10000
Particle size (~m)
Figure 24 Particle size distribution of un ground and ground POFA and OPC (Sata et ai
2004)
12
LIST OF FIGURES
Figure 21 OPC (Chindaprasirt et aI 2007) 12
Figure 24 Particle size distribution ofunground and ground POFA and OPC (Sata et aI
Figure 25 Effect ofunground POFA on the compressive strength of concrete at 28 days (Tay
Figure 26 Effect of ground POF A on the compressive strength at different test ages
Figure 27 Effect of ground POFA on the splitting tensile strength of concrete (Sata et aI
Figure 22 Unground POF A (Jaturapitakkul et aI 2007) 12
Fjgure 23 Ground POFA Jaturapitakkul et aI 2007) 12
2004) 12
1990) 17
(Tangchirapat et aI 2009) 17
2007) 18
Figure 31 POFA 22
Figure 32 Sieved POFA 22
Figure 33 Sieve analysis for sand 24
Figure 34 Sieve analysis for coarse aggregate 25
Figure 41 The Slump 30
Figure 42 Compressive Strength for 3 7 and 28 days 33
Figure 43 Splitting Tensile Strength for 3 7 and 28 days 37
LIST OF APPENDICES
APPENDIX A Processes of Specific Gravity of Coarse Aggregate 45
APPENDIX B Processes of Specific Gravity of Fine Aggreagte 46
APPENDIX C Processes of Concrete Mixing Casting and Curing 48
APPENDIX D Processes of Slump Test 50
APPENDIX E Processes of Compressive Strength Test 51
APPENDIX F Processes of Splitting Tensile Strength Test 52
xii
CHAPTER 1
INTRODUCTION
11 Introduction
Concrete is usually a composite material that is used in civil engineering construction work It
is typically a mixture of cement water aggregate and also other admixtures Concrete is
strong in compression because the aggregate has the ability to carry the compression load
however it is extremely weak in tension
Cement consists of adhesive and cohesive properties which enable it to bond mineral
fragments into a solid mass Cement contains silicates and aluminates of lime which are made
from blended and ground limestone and clay According to Dobrowolski (1998) portland
cement is the most commonly used hydraulic ~ement for making concrete around the world It
is considered as the most significant component of hydraulic cement which hardens due to
hydration a chemical reaction between cement powder and water In concrete design and
quality control strength is the property usually specified The water-cementitious materials
ratio the extent of hydration the curing and environmental conditions are the main factors
that influence the strength of concrete The ultimate compressive strength and rate of strength
development of concrete are also greatly dependent on the chemical and physical properties of
the cement
Higher demands for construction works have contributed to augmentation of cement
production as one of the main components of concrete manufacture As a result the
production of cement leads to increase the concern of global warming as CO2 emission is
released to atmosphere However the variety of studies about various supplementary
1
cementing material involved in concrete production has been conducted in recent years
Nowadays the use of various supplementary cementing materials such as Fly Ash Blastshy
Furnace Slag Silica Fume Rice husk Ash and other fiber and pozzolanic material are gaining
popularity due to increasingly stringent environmental legislation In addition the use of
various supplementary cementing materials is also a common practice since they are
significantly reducing the cement content and improve the ultimate strength of the concrete
In this study the study about the use of Palm Oil Fuel Ash (POF A) as a supplementary
cementing material in concrete production is carried out The influence of POF A and its
degree of fmeness on the mechanical properties of concrete is investigated In Malaysia palm
oil industry is considered as the most important agro industries POF A is a by-product which
is generated from the combustion of palm oil plant residues In this study POF A is used as a
pozzolanic material and also a replacement of cement in concrete to produce cementitious
properties Pozzolan is defined as a siliceous or siliceous and aluminous material where the
particles react with calcium hydroxide from the cement to produce cementitious properties
The utilization of pozzolanic material in concrete would reduce the negative environmental
effect and landfill volume for the disposal of wastes
12 Problem Statement
The presence of palm oil wastes has created a major disposal problem due to a large amount
of solid waste materials is produced such as palm fiber nutshells and empty fruit bunches
from palm oil industry which is burnt at temperatures of about 800-1000 degC as fuels to
provide steam for electricity generation in palm oil mills After the burning process an ash
by-product are obtained which is about 5 by weight of the residues known as palm oil fuel
ash (pOF A) It has been reported that around 4 million tonsyears of POF A are produced in
2
Malaysia only (Zarina 2012) While the quantity of PO FA is rising annually its utilization is
limited and basically disposed of as a waste in landfills without any profitable return It can
also affect environmental problems such as health hazards and financial loss
13 Research Significance
There are several significances in this research project Firstly PDFA is incorporated as
supplementary cementing material in the concrete mix as to promote the use of agricultural
waste and create a more sustainable environment besides its own ability to improve strength
development of concrete Next it is also important that to obtain a mix proportion to produce
concrete incorporated with PDFA and studies the mechanical properties of concrete in term of
compressive strength and splitting tensile strength
14 Aim and Objectives
The aim of this research project is to conduct an experimental testing program to determine
the effects of PDFA fineness on the mechanical properties of concrete The objectives of the
research project are
1 To obtain a mix proportion containing different PDFA fineness which can achieve a
targeted strength of 30 Nmm2 at 28 days and slump of 60mm-180mm
II To study the mechanical properties of concr~te by using POFA with 3 different
fineness which are passing through 38wn 631m and 751m
1S Scope of work
The study focuses on the effect of PDFA fineness on the mechanical properties of concrete
The study only limited to test for three types of PDFA fineness which are 381m 631ffi and
3
75JlM with 15 PDFA replacement Three laboratories experimental tests is carried out
namely slump test compressive strength test and splitting tensile strength test The slump test
is carried out to detennine the workability of fresh concrete The concrete sample is cured in
the water and tested for 3 days 7 days and 28 days strength Consequently two mechanical
properties of concrete such as compressive strength and splitting tensile strength will be tested
in this study
16 Thesis Organisation
This report contains five chapters which are introduction literature review methodology
result and discussion and conclusion respectively
Chapter I discuss the general background of the research problem statement scope of work
aim and objectives and thesis significance
Chapter 2 discuss the admixture which is also one of the components of concrete mix Besides
that a general background for four types of pozzolanic materials such as fly ash blast furnace
slag silica fume and rice husk ash will be discussed in this chapter In addition the properties
of PDF A such as physical and chemical composition will also be discussed in this chapter
Moreover a previous study about the effect of PDF A on the mechanical properties of
concrete will be studied Lastly a previous research about the effect of fineness on properties
ofconcrete will be also discussed
Chapter 3 explain various laboratory tests will be carried out in this chapter In this chapter
three laboratory experiments will be conducted such as slump test compressive strength test
and splitting tensile strength test In addition experiment setups will be stated in this chapter
4
r-~-------~-----p~rKhldmat Mak1umat Akauemillt UNIVERSrn MALAYSIA SAltAWAIlt
Chapter 4 generally presents and discusses about the result of each laboratory tests that
conducted in tenn of compressive strength and splitting tensile strength
Chapter 5 conclude the whole study has been conducted A conclusion has been drawn with
relevant objectives stated based on the result achieved from this study Besides that there are
few recommendations will be listed in this chapter
5
CHAPTER 2
LITERATURE REVIEW
21 Introduction
During recent decades there are many researchers have been carried out for the use of
admixture in concrete mixture such as fly ash blast-furnace slag silica fume rice husk ash
and also palm oil fuel ash Besides that the properties of POF A are also briefly discussed and
previous study about the effects of POF A on the mechanical properties of concrete are also
reviewed Lastly previous study about the effects of fineness on the properties of concrete are
also reviewed
22 Admixture
Admixture is used as an additional material which is added to concrete mixtures It is varying
widely in chemical composition from surfactants and soluble salts to polymers and insoluble
minerals The properties of concrete such as workability strength and durability can be
improved by adding admixtures to concrete batch (Monte rio amp Mehta 2006) Besides that
the use of admixture in concrete mixtures may also increase or decrease the cost of concrete
by lowering the required cement content changing the volume of the concrete mixture or
reducing the cost of concrete placing and finishing Thus admixture plays an important role
in concrete mixtures Admixture can be categorised into 2 categorise which is mineral
admixture (fly ash silica fume and others) and chemical admixture (air-entering agents
accelerators water-reducing admixtures However mineral admixtures are more emphasized
in this study and used as supplementary cementitious material for producing concrete
6
Mineral admixtures are categorised into 2 classifications which are natural materials and byshy
product materials Some mineral admixtures can be pozzolanic cementitious and however
others are both cementitious and pozzolanic (Monterio amp Mehta 2006) Natural materials are
defined as a material that has been treated for the only purpose of making a pozzolan
Generally the process involves crushing grinding and size separation occasionally it may
also include thermal activation On the other hand by-product materials are defined as a
material that is not the primary products which produced from industry It mayor may not
require any processing before use as mineral admixtures
However by-product materials are more highlighted in this study Consequently the physiGal
and chemical and mineralogical properties of palm oil fuel ash (PDF A) will be further
discussed in this study Besides that effect of PDF A on the mechanical properties of concrete
will be also discussed in this study
23 Types of Mineral Admixtures from By-product
A variety of by-product materials such as fly ash blast-furnace slag silica fume rice husk ash
and others have been commonly used as pozzolanic materials in concrete The utilization of
pozzolanic material not only enhances the properties of concrete but also protects the
environment
231 Fly Ash
According to Day (2006) fly ash is also known as pulverized fuel ash which is produced from
the combustion of coal in thermal power plants During combustion the mineral impurities
such as clays quartz and feldspar melt in suspension at the high temperature and float out
with the flue gas stream As the fused material rises it is transported to low temperature zones
7
allow it cools and then it solidifies as spherical particles of glass which are called fly ash This
fly ash is collected from the flue gas stream by mechanical separators electrostatic
precipitation or bag filters (Nawy 2008) Fly ash can be categorised into two different types
which are Class C and Class F (ASTM C 618-78) Class C ash is consists of high-calcium fly
ashes with carbon content less than 2 while Class F ash contains low-calcium fly ashes
with carbon content less than 5 but sometimes as high as 10 Class C ash is usually
obtained from burning sub-bituminous or lignite coals whereas Class F ashes are obtained
from burning bituminous or anthracite coals The chemical and physical properties of the ash
have significant impact on the performance properties between Class F and C ashes The
physical properties of fly ashes are depending to the source Fly ash is a fine-grained material
which contains spherical glassy particles The particles can be irregular or angular shapes and
its size is depending on the sources The particles of fly ash may be finer or coarser than
Portland cement particles On the other hand the mineralogical properties of fly ash are
significant influenced by both the type and source of fly ash Fly ash contains noncrystalline
particles or glass and a small quantity of crystalline material as result from the rapid cooling
ofburned coal in the power plant
232 Blast-Furnace Slag
Blast-furnace slag is a by-product of the production of iron (Nawy 2008) When it is quickly
cool down with water to glassy state and finely ground thus the property of latent
hydraulicity will be developed (Nawy 2008) Nowadays the use of blast-furnace slag as an
admixture in concrete is well established In the early 1970s glassy slag was produced by
using pelletizing process which uses much less water than granulation methods Firstly a
treatment with water sprays is used to expand the molten slag and then passed over a rotating
8
fInned drum Lastly the semi molten material is cooled and pelletized by throwing them into
the air
233 SUtea Fume
Silica fume is a byproduct of the production of metallic silicon or ferrosilicon alloys which is
produced by electric arc furnaces (Nawy 2008) The two main components such as the types
of alloy fonned and the composition of quartz and coal are commonly used in the electric arc
furnaces which are significantly influence the chemical composition of silica fume The
majority ofpublished data indicates that the utilization of silica fume in concrete must contain
at least 75 ferro silicon
234 Rice Husk Ash
Rice husk ash is a by-product of the agricultural industry which is produced from burning a
mixture of rice husk and eucalyptus bark by fluidized bed combustion process in a biomass
power plant It consists of high amount of Si02 Silica content in the ash increases with higher
the burning temperature Many researches described that rice husk ash consists of high
reactivity and pozzolanic property after burning process at controlled temperature Chemical
composition of rice husk ash is greatly influenced by the temperature during burning
processes
24 The PbysieaJ Properties of POFA
According to AbdullaH et al (2006) the burning temperature condition is one of factors that
significantly influence the physical properties of POFA Several of physical properties of
9
Wlground and ground POF A used in various studies are shown in Table 21 These all
properties ofunground and ground POFA are briefly discussed below
Table 21 Physical properties of unground and ground POF A (Safiuddin et al 2011)
Properties OPC Unground POFA Ground PO FA
Color Grey Light greywhitish Dark grey
Specific gravity 314-328 178-197 222-278
Median particle size dso(urn) 10-20 543-183 72-101
Passing through 45-urn sieve 56-588 97-99
( mass)
Specific surface area Blaine 314-358 796 882-1244
(m2kg)
Strength activity index () 786-115
SOWldness Le Chatelier 045-1 05-26
expansion (mm)
141 Color
UngroWld POF A is usually in light grey color as results from the unburnt carbon content left
at relatively low burning temperature The content of unburnt carbon becomes very low when
the burning temperature is high Besides that unground POF A can also be whitish color in the
absence of unburnt carbon (Abdullah et al 2006) On the other hand ground POF A is dark
grey color
10
141 Specific Gravity
The specific gravity of unground POFA is normally varies in the range of 178-197 From
Table 21 above it can be seen that the specific gravity of unground POF A is about 40
lower than the specific gravity of ope (Tay 1990) However the specific gravity of POF A is
increased and it is about in the range of 222-278 after the grinding process (Sata et al 2004
Tangchirapat et al 2009) It is because the particle size of POF A is reduced and then the
porosity also decreased as results from grinding processes
143 Particle Shape and Size
The particle shape and size of unground POF A is different as compare to ground POF A It
was found that the particle shape and size are mostly large spherical and porous as shown in
Figure 22 In contrast ground POF A is quite similar to Portland cement which crushed
particle is usually in irregular and angular shape as shown in Figure 21 amp 23 ( Chindaprasirt
et al 2007) The particle size of unground POFA is larger than OPC however the particle
size of ground POF A is smaller than OPe The typical particle size distributions of unground
and ground POF A and ope are shown in Figure 24 The median particle size of unground
POFA is about 543)lm -183)lm which is larger than ope which is in the range of I011m -20
1Jlll However the particle size of POFA is decreased to 72)lffi -lO1)lm after grinding
processes (Sata et al 2004 Chindaprasit et at 2008)
11
Figure 21 OPC (Chindaprasirt et ai 2007) Figure 22 Unground POFA (Jaturapitakkul
et ai 2007)
Figure 23 Ground POFA (Jaturapitakkul et ai 2007)
100 r==III~~iITinTI-1M-7I1
II
rriTiT11 Ground POFA JIl jill
90 ope mill J UOOUnd POFA t++tt+-l~I11H80 III IIT~+IIiI--+++IH
70 ~~t+~~UU~~~I IIIV-J~~U oo ~~U~~~Hm+M~~~I~~~
50 +-+tttlitl t-+-Ii+Itflt-+f+TMIlH-i++IHIt-I+tt+Ilt-i~ 1JlIIlt~ 40 +-r-lliM-=-+WII--l-+4R-++I r-H+fllf-++I I N+-i
~ ~~~I~~~~~J~Ir+~ 2o ~~~~~~~~~~~~~~~I I10 ~~~~~~A~~~_I_I~~~ o 1 w
001 01 10 00 1000 10000
Particle size (~m)
Figure 24 Particle size distribution of un ground and ground POFA and OPC (Sata et ai
2004)
12
LIST OF APPENDICES
APPENDIX A Processes of Specific Gravity of Coarse Aggregate 45
APPENDIX B Processes of Specific Gravity of Fine Aggreagte 46
APPENDIX C Processes of Concrete Mixing Casting and Curing 48
APPENDIX D Processes of Slump Test 50
APPENDIX E Processes of Compressive Strength Test 51
APPENDIX F Processes of Splitting Tensile Strength Test 52
xii
CHAPTER 1
INTRODUCTION
11 Introduction
Concrete is usually a composite material that is used in civil engineering construction work It
is typically a mixture of cement water aggregate and also other admixtures Concrete is
strong in compression because the aggregate has the ability to carry the compression load
however it is extremely weak in tension
Cement consists of adhesive and cohesive properties which enable it to bond mineral
fragments into a solid mass Cement contains silicates and aluminates of lime which are made
from blended and ground limestone and clay According to Dobrowolski (1998) portland
cement is the most commonly used hydraulic ~ement for making concrete around the world It
is considered as the most significant component of hydraulic cement which hardens due to
hydration a chemical reaction between cement powder and water In concrete design and
quality control strength is the property usually specified The water-cementitious materials
ratio the extent of hydration the curing and environmental conditions are the main factors
that influence the strength of concrete The ultimate compressive strength and rate of strength
development of concrete are also greatly dependent on the chemical and physical properties of
the cement
Higher demands for construction works have contributed to augmentation of cement
production as one of the main components of concrete manufacture As a result the
production of cement leads to increase the concern of global warming as CO2 emission is
released to atmosphere However the variety of studies about various supplementary
1
cementing material involved in concrete production has been conducted in recent years
Nowadays the use of various supplementary cementing materials such as Fly Ash Blastshy
Furnace Slag Silica Fume Rice husk Ash and other fiber and pozzolanic material are gaining
popularity due to increasingly stringent environmental legislation In addition the use of
various supplementary cementing materials is also a common practice since they are
significantly reducing the cement content and improve the ultimate strength of the concrete
In this study the study about the use of Palm Oil Fuel Ash (POF A) as a supplementary
cementing material in concrete production is carried out The influence of POF A and its
degree of fmeness on the mechanical properties of concrete is investigated In Malaysia palm
oil industry is considered as the most important agro industries POF A is a by-product which
is generated from the combustion of palm oil plant residues In this study POF A is used as a
pozzolanic material and also a replacement of cement in concrete to produce cementitious
properties Pozzolan is defined as a siliceous or siliceous and aluminous material where the
particles react with calcium hydroxide from the cement to produce cementitious properties
The utilization of pozzolanic material in concrete would reduce the negative environmental
effect and landfill volume for the disposal of wastes
12 Problem Statement
The presence of palm oil wastes has created a major disposal problem due to a large amount
of solid waste materials is produced such as palm fiber nutshells and empty fruit bunches
from palm oil industry which is burnt at temperatures of about 800-1000 degC as fuels to
provide steam for electricity generation in palm oil mills After the burning process an ash
by-product are obtained which is about 5 by weight of the residues known as palm oil fuel
ash (pOF A) It has been reported that around 4 million tonsyears of POF A are produced in
2
Malaysia only (Zarina 2012) While the quantity of PO FA is rising annually its utilization is
limited and basically disposed of as a waste in landfills without any profitable return It can
also affect environmental problems such as health hazards and financial loss
13 Research Significance
There are several significances in this research project Firstly PDFA is incorporated as
supplementary cementing material in the concrete mix as to promote the use of agricultural
waste and create a more sustainable environment besides its own ability to improve strength
development of concrete Next it is also important that to obtain a mix proportion to produce
concrete incorporated with PDFA and studies the mechanical properties of concrete in term of
compressive strength and splitting tensile strength
14 Aim and Objectives
The aim of this research project is to conduct an experimental testing program to determine
the effects of PDFA fineness on the mechanical properties of concrete The objectives of the
research project are
1 To obtain a mix proportion containing different PDFA fineness which can achieve a
targeted strength of 30 Nmm2 at 28 days and slump of 60mm-180mm
II To study the mechanical properties of concr~te by using POFA with 3 different
fineness which are passing through 38wn 631m and 751m
1S Scope of work
The study focuses on the effect of PDFA fineness on the mechanical properties of concrete
The study only limited to test for three types of PDFA fineness which are 381m 631ffi and
3
75JlM with 15 PDFA replacement Three laboratories experimental tests is carried out
namely slump test compressive strength test and splitting tensile strength test The slump test
is carried out to detennine the workability of fresh concrete The concrete sample is cured in
the water and tested for 3 days 7 days and 28 days strength Consequently two mechanical
properties of concrete such as compressive strength and splitting tensile strength will be tested
in this study
16 Thesis Organisation
This report contains five chapters which are introduction literature review methodology
result and discussion and conclusion respectively
Chapter I discuss the general background of the research problem statement scope of work
aim and objectives and thesis significance
Chapter 2 discuss the admixture which is also one of the components of concrete mix Besides
that a general background for four types of pozzolanic materials such as fly ash blast furnace
slag silica fume and rice husk ash will be discussed in this chapter In addition the properties
of PDF A such as physical and chemical composition will also be discussed in this chapter
Moreover a previous study about the effect of PDF A on the mechanical properties of
concrete will be studied Lastly a previous research about the effect of fineness on properties
ofconcrete will be also discussed
Chapter 3 explain various laboratory tests will be carried out in this chapter In this chapter
three laboratory experiments will be conducted such as slump test compressive strength test
and splitting tensile strength test In addition experiment setups will be stated in this chapter
4
r-~-------~-----p~rKhldmat Mak1umat Akauemillt UNIVERSrn MALAYSIA SAltAWAIlt
Chapter 4 generally presents and discusses about the result of each laboratory tests that
conducted in tenn of compressive strength and splitting tensile strength
Chapter 5 conclude the whole study has been conducted A conclusion has been drawn with
relevant objectives stated based on the result achieved from this study Besides that there are
few recommendations will be listed in this chapter
5
CHAPTER 2
LITERATURE REVIEW
21 Introduction
During recent decades there are many researchers have been carried out for the use of
admixture in concrete mixture such as fly ash blast-furnace slag silica fume rice husk ash
and also palm oil fuel ash Besides that the properties of POF A are also briefly discussed and
previous study about the effects of POF A on the mechanical properties of concrete are also
reviewed Lastly previous study about the effects of fineness on the properties of concrete are
also reviewed
22 Admixture
Admixture is used as an additional material which is added to concrete mixtures It is varying
widely in chemical composition from surfactants and soluble salts to polymers and insoluble
minerals The properties of concrete such as workability strength and durability can be
improved by adding admixtures to concrete batch (Monte rio amp Mehta 2006) Besides that
the use of admixture in concrete mixtures may also increase or decrease the cost of concrete
by lowering the required cement content changing the volume of the concrete mixture or
reducing the cost of concrete placing and finishing Thus admixture plays an important role
in concrete mixtures Admixture can be categorised into 2 categorise which is mineral
admixture (fly ash silica fume and others) and chemical admixture (air-entering agents
accelerators water-reducing admixtures However mineral admixtures are more emphasized
in this study and used as supplementary cementitious material for producing concrete
6
Mineral admixtures are categorised into 2 classifications which are natural materials and byshy
product materials Some mineral admixtures can be pozzolanic cementitious and however
others are both cementitious and pozzolanic (Monterio amp Mehta 2006) Natural materials are
defined as a material that has been treated for the only purpose of making a pozzolan
Generally the process involves crushing grinding and size separation occasionally it may
also include thermal activation On the other hand by-product materials are defined as a
material that is not the primary products which produced from industry It mayor may not
require any processing before use as mineral admixtures
However by-product materials are more highlighted in this study Consequently the physiGal
and chemical and mineralogical properties of palm oil fuel ash (PDF A) will be further
discussed in this study Besides that effect of PDF A on the mechanical properties of concrete
will be also discussed in this study
23 Types of Mineral Admixtures from By-product
A variety of by-product materials such as fly ash blast-furnace slag silica fume rice husk ash
and others have been commonly used as pozzolanic materials in concrete The utilization of
pozzolanic material not only enhances the properties of concrete but also protects the
environment
231 Fly Ash
According to Day (2006) fly ash is also known as pulverized fuel ash which is produced from
the combustion of coal in thermal power plants During combustion the mineral impurities
such as clays quartz and feldspar melt in suspension at the high temperature and float out
with the flue gas stream As the fused material rises it is transported to low temperature zones
7
allow it cools and then it solidifies as spherical particles of glass which are called fly ash This
fly ash is collected from the flue gas stream by mechanical separators electrostatic
precipitation or bag filters (Nawy 2008) Fly ash can be categorised into two different types
which are Class C and Class F (ASTM C 618-78) Class C ash is consists of high-calcium fly
ashes with carbon content less than 2 while Class F ash contains low-calcium fly ashes
with carbon content less than 5 but sometimes as high as 10 Class C ash is usually
obtained from burning sub-bituminous or lignite coals whereas Class F ashes are obtained
from burning bituminous or anthracite coals The chemical and physical properties of the ash
have significant impact on the performance properties between Class F and C ashes The
physical properties of fly ashes are depending to the source Fly ash is a fine-grained material
which contains spherical glassy particles The particles can be irregular or angular shapes and
its size is depending on the sources The particles of fly ash may be finer or coarser than
Portland cement particles On the other hand the mineralogical properties of fly ash are
significant influenced by both the type and source of fly ash Fly ash contains noncrystalline
particles or glass and a small quantity of crystalline material as result from the rapid cooling
ofburned coal in the power plant
232 Blast-Furnace Slag
Blast-furnace slag is a by-product of the production of iron (Nawy 2008) When it is quickly
cool down with water to glassy state and finely ground thus the property of latent
hydraulicity will be developed (Nawy 2008) Nowadays the use of blast-furnace slag as an
admixture in concrete is well established In the early 1970s glassy slag was produced by
using pelletizing process which uses much less water than granulation methods Firstly a
treatment with water sprays is used to expand the molten slag and then passed over a rotating
8
fInned drum Lastly the semi molten material is cooled and pelletized by throwing them into
the air
233 SUtea Fume
Silica fume is a byproduct of the production of metallic silicon or ferrosilicon alloys which is
produced by electric arc furnaces (Nawy 2008) The two main components such as the types
of alloy fonned and the composition of quartz and coal are commonly used in the electric arc
furnaces which are significantly influence the chemical composition of silica fume The
majority ofpublished data indicates that the utilization of silica fume in concrete must contain
at least 75 ferro silicon
234 Rice Husk Ash
Rice husk ash is a by-product of the agricultural industry which is produced from burning a
mixture of rice husk and eucalyptus bark by fluidized bed combustion process in a biomass
power plant It consists of high amount of Si02 Silica content in the ash increases with higher
the burning temperature Many researches described that rice husk ash consists of high
reactivity and pozzolanic property after burning process at controlled temperature Chemical
composition of rice husk ash is greatly influenced by the temperature during burning
processes
24 The PbysieaJ Properties of POFA
According to AbdullaH et al (2006) the burning temperature condition is one of factors that
significantly influence the physical properties of POFA Several of physical properties of
9
Wlground and ground POF A used in various studies are shown in Table 21 These all
properties ofunground and ground POFA are briefly discussed below
Table 21 Physical properties of unground and ground POF A (Safiuddin et al 2011)
Properties OPC Unground POFA Ground PO FA
Color Grey Light greywhitish Dark grey
Specific gravity 314-328 178-197 222-278
Median particle size dso(urn) 10-20 543-183 72-101
Passing through 45-urn sieve 56-588 97-99
( mass)
Specific surface area Blaine 314-358 796 882-1244
(m2kg)
Strength activity index () 786-115
SOWldness Le Chatelier 045-1 05-26
expansion (mm)
141 Color
UngroWld POF A is usually in light grey color as results from the unburnt carbon content left
at relatively low burning temperature The content of unburnt carbon becomes very low when
the burning temperature is high Besides that unground POF A can also be whitish color in the
absence of unburnt carbon (Abdullah et al 2006) On the other hand ground POF A is dark
grey color
10
141 Specific Gravity
The specific gravity of unground POFA is normally varies in the range of 178-197 From
Table 21 above it can be seen that the specific gravity of unground POF A is about 40
lower than the specific gravity of ope (Tay 1990) However the specific gravity of POF A is
increased and it is about in the range of 222-278 after the grinding process (Sata et al 2004
Tangchirapat et al 2009) It is because the particle size of POF A is reduced and then the
porosity also decreased as results from grinding processes
143 Particle Shape and Size
The particle shape and size of unground POF A is different as compare to ground POF A It
was found that the particle shape and size are mostly large spherical and porous as shown in
Figure 22 In contrast ground POF A is quite similar to Portland cement which crushed
particle is usually in irregular and angular shape as shown in Figure 21 amp 23 ( Chindaprasirt
et al 2007) The particle size of unground POFA is larger than OPC however the particle
size of ground POF A is smaller than OPe The typical particle size distributions of unground
and ground POF A and ope are shown in Figure 24 The median particle size of unground
POFA is about 543)lm -183)lm which is larger than ope which is in the range of I011m -20
1Jlll However the particle size of POFA is decreased to 72)lffi -lO1)lm after grinding
processes (Sata et al 2004 Chindaprasit et at 2008)
11
Figure 21 OPC (Chindaprasirt et ai 2007) Figure 22 Unground POFA (Jaturapitakkul
et ai 2007)
Figure 23 Ground POFA (Jaturapitakkul et ai 2007)
100 r==III~~iITinTI-1M-7I1
II
rriTiT11 Ground POFA JIl jill
90 ope mill J UOOUnd POFA t++tt+-l~I11H80 III IIT~+IIiI--+++IH
70 ~~t+~~UU~~~I IIIV-J~~U oo ~~U~~~Hm+M~~~I~~~
50 +-+tttlitl t-+-Ii+Itflt-+f+TMIlH-i++IHIt-I+tt+Ilt-i~ 1JlIIlt~ 40 +-r-lliM-=-+WII--l-+4R-++I r-H+fllf-++I I N+-i
~ ~~~I~~~~~J~Ir+~ 2o ~~~~~~~~~~~~~~~I I10 ~~~~~~A~~~_I_I~~~ o 1 w
001 01 10 00 1000 10000
Particle size (~m)
Figure 24 Particle size distribution of un ground and ground POFA and OPC (Sata et ai
2004)
12
CHAPTER 1
INTRODUCTION
11 Introduction
Concrete is usually a composite material that is used in civil engineering construction work It
is typically a mixture of cement water aggregate and also other admixtures Concrete is
strong in compression because the aggregate has the ability to carry the compression load
however it is extremely weak in tension
Cement consists of adhesive and cohesive properties which enable it to bond mineral
fragments into a solid mass Cement contains silicates and aluminates of lime which are made
from blended and ground limestone and clay According to Dobrowolski (1998) portland
cement is the most commonly used hydraulic ~ement for making concrete around the world It
is considered as the most significant component of hydraulic cement which hardens due to
hydration a chemical reaction between cement powder and water In concrete design and
quality control strength is the property usually specified The water-cementitious materials
ratio the extent of hydration the curing and environmental conditions are the main factors
that influence the strength of concrete The ultimate compressive strength and rate of strength
development of concrete are also greatly dependent on the chemical and physical properties of
the cement
Higher demands for construction works have contributed to augmentation of cement
production as one of the main components of concrete manufacture As a result the
production of cement leads to increase the concern of global warming as CO2 emission is
released to atmosphere However the variety of studies about various supplementary
1
cementing material involved in concrete production has been conducted in recent years
Nowadays the use of various supplementary cementing materials such as Fly Ash Blastshy
Furnace Slag Silica Fume Rice husk Ash and other fiber and pozzolanic material are gaining
popularity due to increasingly stringent environmental legislation In addition the use of
various supplementary cementing materials is also a common practice since they are
significantly reducing the cement content and improve the ultimate strength of the concrete
In this study the study about the use of Palm Oil Fuel Ash (POF A) as a supplementary
cementing material in concrete production is carried out The influence of POF A and its
degree of fmeness on the mechanical properties of concrete is investigated In Malaysia palm
oil industry is considered as the most important agro industries POF A is a by-product which
is generated from the combustion of palm oil plant residues In this study POF A is used as a
pozzolanic material and also a replacement of cement in concrete to produce cementitious
properties Pozzolan is defined as a siliceous or siliceous and aluminous material where the
particles react with calcium hydroxide from the cement to produce cementitious properties
The utilization of pozzolanic material in concrete would reduce the negative environmental
effect and landfill volume for the disposal of wastes
12 Problem Statement
The presence of palm oil wastes has created a major disposal problem due to a large amount
of solid waste materials is produced such as palm fiber nutshells and empty fruit bunches
from palm oil industry which is burnt at temperatures of about 800-1000 degC as fuels to
provide steam for electricity generation in palm oil mills After the burning process an ash
by-product are obtained which is about 5 by weight of the residues known as palm oil fuel
ash (pOF A) It has been reported that around 4 million tonsyears of POF A are produced in
2
Malaysia only (Zarina 2012) While the quantity of PO FA is rising annually its utilization is
limited and basically disposed of as a waste in landfills without any profitable return It can
also affect environmental problems such as health hazards and financial loss
13 Research Significance
There are several significances in this research project Firstly PDFA is incorporated as
supplementary cementing material in the concrete mix as to promote the use of agricultural
waste and create a more sustainable environment besides its own ability to improve strength
development of concrete Next it is also important that to obtain a mix proportion to produce
concrete incorporated with PDFA and studies the mechanical properties of concrete in term of
compressive strength and splitting tensile strength
14 Aim and Objectives
The aim of this research project is to conduct an experimental testing program to determine
the effects of PDFA fineness on the mechanical properties of concrete The objectives of the
research project are
1 To obtain a mix proportion containing different PDFA fineness which can achieve a
targeted strength of 30 Nmm2 at 28 days and slump of 60mm-180mm
II To study the mechanical properties of concr~te by using POFA with 3 different
fineness which are passing through 38wn 631m and 751m
1S Scope of work
The study focuses on the effect of PDFA fineness on the mechanical properties of concrete
The study only limited to test for three types of PDFA fineness which are 381m 631ffi and
3
75JlM with 15 PDFA replacement Three laboratories experimental tests is carried out
namely slump test compressive strength test and splitting tensile strength test The slump test
is carried out to detennine the workability of fresh concrete The concrete sample is cured in
the water and tested for 3 days 7 days and 28 days strength Consequently two mechanical
properties of concrete such as compressive strength and splitting tensile strength will be tested
in this study
16 Thesis Organisation
This report contains five chapters which are introduction literature review methodology
result and discussion and conclusion respectively
Chapter I discuss the general background of the research problem statement scope of work
aim and objectives and thesis significance
Chapter 2 discuss the admixture which is also one of the components of concrete mix Besides
that a general background for four types of pozzolanic materials such as fly ash blast furnace
slag silica fume and rice husk ash will be discussed in this chapter In addition the properties
of PDF A such as physical and chemical composition will also be discussed in this chapter
Moreover a previous study about the effect of PDF A on the mechanical properties of
concrete will be studied Lastly a previous research about the effect of fineness on properties
ofconcrete will be also discussed
Chapter 3 explain various laboratory tests will be carried out in this chapter In this chapter
three laboratory experiments will be conducted such as slump test compressive strength test
and splitting tensile strength test In addition experiment setups will be stated in this chapter
4
r-~-------~-----p~rKhldmat Mak1umat Akauemillt UNIVERSrn MALAYSIA SAltAWAIlt
Chapter 4 generally presents and discusses about the result of each laboratory tests that
conducted in tenn of compressive strength and splitting tensile strength
Chapter 5 conclude the whole study has been conducted A conclusion has been drawn with
relevant objectives stated based on the result achieved from this study Besides that there are
few recommendations will be listed in this chapter
5
CHAPTER 2
LITERATURE REVIEW
21 Introduction
During recent decades there are many researchers have been carried out for the use of
admixture in concrete mixture such as fly ash blast-furnace slag silica fume rice husk ash
and also palm oil fuel ash Besides that the properties of POF A are also briefly discussed and
previous study about the effects of POF A on the mechanical properties of concrete are also
reviewed Lastly previous study about the effects of fineness on the properties of concrete are
also reviewed
22 Admixture
Admixture is used as an additional material which is added to concrete mixtures It is varying
widely in chemical composition from surfactants and soluble salts to polymers and insoluble
minerals The properties of concrete such as workability strength and durability can be
improved by adding admixtures to concrete batch (Monte rio amp Mehta 2006) Besides that
the use of admixture in concrete mixtures may also increase or decrease the cost of concrete
by lowering the required cement content changing the volume of the concrete mixture or
reducing the cost of concrete placing and finishing Thus admixture plays an important role
in concrete mixtures Admixture can be categorised into 2 categorise which is mineral
admixture (fly ash silica fume and others) and chemical admixture (air-entering agents
accelerators water-reducing admixtures However mineral admixtures are more emphasized
in this study and used as supplementary cementitious material for producing concrete
6
Mineral admixtures are categorised into 2 classifications which are natural materials and byshy
product materials Some mineral admixtures can be pozzolanic cementitious and however
others are both cementitious and pozzolanic (Monterio amp Mehta 2006) Natural materials are
defined as a material that has been treated for the only purpose of making a pozzolan
Generally the process involves crushing grinding and size separation occasionally it may
also include thermal activation On the other hand by-product materials are defined as a
material that is not the primary products which produced from industry It mayor may not
require any processing before use as mineral admixtures
However by-product materials are more highlighted in this study Consequently the physiGal
and chemical and mineralogical properties of palm oil fuel ash (PDF A) will be further
discussed in this study Besides that effect of PDF A on the mechanical properties of concrete
will be also discussed in this study
23 Types of Mineral Admixtures from By-product
A variety of by-product materials such as fly ash blast-furnace slag silica fume rice husk ash
and others have been commonly used as pozzolanic materials in concrete The utilization of
pozzolanic material not only enhances the properties of concrete but also protects the
environment
231 Fly Ash
According to Day (2006) fly ash is also known as pulverized fuel ash which is produced from
the combustion of coal in thermal power plants During combustion the mineral impurities
such as clays quartz and feldspar melt in suspension at the high temperature and float out
with the flue gas stream As the fused material rises it is transported to low temperature zones
7
allow it cools and then it solidifies as spherical particles of glass which are called fly ash This
fly ash is collected from the flue gas stream by mechanical separators electrostatic
precipitation or bag filters (Nawy 2008) Fly ash can be categorised into two different types
which are Class C and Class F (ASTM C 618-78) Class C ash is consists of high-calcium fly
ashes with carbon content less than 2 while Class F ash contains low-calcium fly ashes
with carbon content less than 5 but sometimes as high as 10 Class C ash is usually
obtained from burning sub-bituminous or lignite coals whereas Class F ashes are obtained
from burning bituminous or anthracite coals The chemical and physical properties of the ash
have significant impact on the performance properties between Class F and C ashes The
physical properties of fly ashes are depending to the source Fly ash is a fine-grained material
which contains spherical glassy particles The particles can be irregular or angular shapes and
its size is depending on the sources The particles of fly ash may be finer or coarser than
Portland cement particles On the other hand the mineralogical properties of fly ash are
significant influenced by both the type and source of fly ash Fly ash contains noncrystalline
particles or glass and a small quantity of crystalline material as result from the rapid cooling
ofburned coal in the power plant
232 Blast-Furnace Slag
Blast-furnace slag is a by-product of the production of iron (Nawy 2008) When it is quickly
cool down with water to glassy state and finely ground thus the property of latent
hydraulicity will be developed (Nawy 2008) Nowadays the use of blast-furnace slag as an
admixture in concrete is well established In the early 1970s glassy slag was produced by
using pelletizing process which uses much less water than granulation methods Firstly a
treatment with water sprays is used to expand the molten slag and then passed over a rotating
8
fInned drum Lastly the semi molten material is cooled and pelletized by throwing them into
the air
233 SUtea Fume
Silica fume is a byproduct of the production of metallic silicon or ferrosilicon alloys which is
produced by electric arc furnaces (Nawy 2008) The two main components such as the types
of alloy fonned and the composition of quartz and coal are commonly used in the electric arc
furnaces which are significantly influence the chemical composition of silica fume The
majority ofpublished data indicates that the utilization of silica fume in concrete must contain
at least 75 ferro silicon
234 Rice Husk Ash
Rice husk ash is a by-product of the agricultural industry which is produced from burning a
mixture of rice husk and eucalyptus bark by fluidized bed combustion process in a biomass
power plant It consists of high amount of Si02 Silica content in the ash increases with higher
the burning temperature Many researches described that rice husk ash consists of high
reactivity and pozzolanic property after burning process at controlled temperature Chemical
composition of rice husk ash is greatly influenced by the temperature during burning
processes
24 The PbysieaJ Properties of POFA
According to AbdullaH et al (2006) the burning temperature condition is one of factors that
significantly influence the physical properties of POFA Several of physical properties of
9
Wlground and ground POF A used in various studies are shown in Table 21 These all
properties ofunground and ground POFA are briefly discussed below
Table 21 Physical properties of unground and ground POF A (Safiuddin et al 2011)
Properties OPC Unground POFA Ground PO FA
Color Grey Light greywhitish Dark grey
Specific gravity 314-328 178-197 222-278
Median particle size dso(urn) 10-20 543-183 72-101
Passing through 45-urn sieve 56-588 97-99
( mass)
Specific surface area Blaine 314-358 796 882-1244
(m2kg)
Strength activity index () 786-115
SOWldness Le Chatelier 045-1 05-26
expansion (mm)
141 Color
UngroWld POF A is usually in light grey color as results from the unburnt carbon content left
at relatively low burning temperature The content of unburnt carbon becomes very low when
the burning temperature is high Besides that unground POF A can also be whitish color in the
absence of unburnt carbon (Abdullah et al 2006) On the other hand ground POF A is dark
grey color
10
141 Specific Gravity
The specific gravity of unground POFA is normally varies in the range of 178-197 From
Table 21 above it can be seen that the specific gravity of unground POF A is about 40
lower than the specific gravity of ope (Tay 1990) However the specific gravity of POF A is
increased and it is about in the range of 222-278 after the grinding process (Sata et al 2004
Tangchirapat et al 2009) It is because the particle size of POF A is reduced and then the
porosity also decreased as results from grinding processes
143 Particle Shape and Size
The particle shape and size of unground POF A is different as compare to ground POF A It
was found that the particle shape and size are mostly large spherical and porous as shown in
Figure 22 In contrast ground POF A is quite similar to Portland cement which crushed
particle is usually in irregular and angular shape as shown in Figure 21 amp 23 ( Chindaprasirt
et al 2007) The particle size of unground POFA is larger than OPC however the particle
size of ground POF A is smaller than OPe The typical particle size distributions of unground
and ground POF A and ope are shown in Figure 24 The median particle size of unground
POFA is about 543)lm -183)lm which is larger than ope which is in the range of I011m -20
1Jlll However the particle size of POFA is decreased to 72)lffi -lO1)lm after grinding
processes (Sata et al 2004 Chindaprasit et at 2008)
11
Figure 21 OPC (Chindaprasirt et ai 2007) Figure 22 Unground POFA (Jaturapitakkul
et ai 2007)
Figure 23 Ground POFA (Jaturapitakkul et ai 2007)
100 r==III~~iITinTI-1M-7I1
II
rriTiT11 Ground POFA JIl jill
90 ope mill J UOOUnd POFA t++tt+-l~I11H80 III IIT~+IIiI--+++IH
70 ~~t+~~UU~~~I IIIV-J~~U oo ~~U~~~Hm+M~~~I~~~
50 +-+tttlitl t-+-Ii+Itflt-+f+TMIlH-i++IHIt-I+tt+Ilt-i~ 1JlIIlt~ 40 +-r-lliM-=-+WII--l-+4R-++I r-H+fllf-++I I N+-i
~ ~~~I~~~~~J~Ir+~ 2o ~~~~~~~~~~~~~~~I I10 ~~~~~~A~~~_I_I~~~ o 1 w
001 01 10 00 1000 10000
Particle size (~m)
Figure 24 Particle size distribution of un ground and ground POFA and OPC (Sata et ai
2004)
12
cementing material involved in concrete production has been conducted in recent years
Nowadays the use of various supplementary cementing materials such as Fly Ash Blastshy
Furnace Slag Silica Fume Rice husk Ash and other fiber and pozzolanic material are gaining
popularity due to increasingly stringent environmental legislation In addition the use of
various supplementary cementing materials is also a common practice since they are
significantly reducing the cement content and improve the ultimate strength of the concrete
In this study the study about the use of Palm Oil Fuel Ash (POF A) as a supplementary
cementing material in concrete production is carried out The influence of POF A and its
degree of fmeness on the mechanical properties of concrete is investigated In Malaysia palm
oil industry is considered as the most important agro industries POF A is a by-product which
is generated from the combustion of palm oil plant residues In this study POF A is used as a
pozzolanic material and also a replacement of cement in concrete to produce cementitious
properties Pozzolan is defined as a siliceous or siliceous and aluminous material where the
particles react with calcium hydroxide from the cement to produce cementitious properties
The utilization of pozzolanic material in concrete would reduce the negative environmental
effect and landfill volume for the disposal of wastes
12 Problem Statement
The presence of palm oil wastes has created a major disposal problem due to a large amount
of solid waste materials is produced such as palm fiber nutshells and empty fruit bunches
from palm oil industry which is burnt at temperatures of about 800-1000 degC as fuels to
provide steam for electricity generation in palm oil mills After the burning process an ash
by-product are obtained which is about 5 by weight of the residues known as palm oil fuel
ash (pOF A) It has been reported that around 4 million tonsyears of POF A are produced in
2
Malaysia only (Zarina 2012) While the quantity of PO FA is rising annually its utilization is
limited and basically disposed of as a waste in landfills without any profitable return It can
also affect environmental problems such as health hazards and financial loss
13 Research Significance
There are several significances in this research project Firstly PDFA is incorporated as
supplementary cementing material in the concrete mix as to promote the use of agricultural
waste and create a more sustainable environment besides its own ability to improve strength
development of concrete Next it is also important that to obtain a mix proportion to produce
concrete incorporated with PDFA and studies the mechanical properties of concrete in term of
compressive strength and splitting tensile strength
14 Aim and Objectives
The aim of this research project is to conduct an experimental testing program to determine
the effects of PDFA fineness on the mechanical properties of concrete The objectives of the
research project are
1 To obtain a mix proportion containing different PDFA fineness which can achieve a
targeted strength of 30 Nmm2 at 28 days and slump of 60mm-180mm
II To study the mechanical properties of concr~te by using POFA with 3 different
fineness which are passing through 38wn 631m and 751m
1S Scope of work
The study focuses on the effect of PDFA fineness on the mechanical properties of concrete
The study only limited to test for three types of PDFA fineness which are 381m 631ffi and
3
75JlM with 15 PDFA replacement Three laboratories experimental tests is carried out
namely slump test compressive strength test and splitting tensile strength test The slump test
is carried out to detennine the workability of fresh concrete The concrete sample is cured in
the water and tested for 3 days 7 days and 28 days strength Consequently two mechanical
properties of concrete such as compressive strength and splitting tensile strength will be tested
in this study
16 Thesis Organisation
This report contains five chapters which are introduction literature review methodology
result and discussion and conclusion respectively
Chapter I discuss the general background of the research problem statement scope of work
aim and objectives and thesis significance
Chapter 2 discuss the admixture which is also one of the components of concrete mix Besides
that a general background for four types of pozzolanic materials such as fly ash blast furnace
slag silica fume and rice husk ash will be discussed in this chapter In addition the properties
of PDF A such as physical and chemical composition will also be discussed in this chapter
Moreover a previous study about the effect of PDF A on the mechanical properties of
concrete will be studied Lastly a previous research about the effect of fineness on properties
ofconcrete will be also discussed
Chapter 3 explain various laboratory tests will be carried out in this chapter In this chapter
three laboratory experiments will be conducted such as slump test compressive strength test
and splitting tensile strength test In addition experiment setups will be stated in this chapter
4
r-~-------~-----p~rKhldmat Mak1umat Akauemillt UNIVERSrn MALAYSIA SAltAWAIlt
Chapter 4 generally presents and discusses about the result of each laboratory tests that
conducted in tenn of compressive strength and splitting tensile strength
Chapter 5 conclude the whole study has been conducted A conclusion has been drawn with
relevant objectives stated based on the result achieved from this study Besides that there are
few recommendations will be listed in this chapter
5
CHAPTER 2
LITERATURE REVIEW
21 Introduction
During recent decades there are many researchers have been carried out for the use of
admixture in concrete mixture such as fly ash blast-furnace slag silica fume rice husk ash
and also palm oil fuel ash Besides that the properties of POF A are also briefly discussed and
previous study about the effects of POF A on the mechanical properties of concrete are also
reviewed Lastly previous study about the effects of fineness on the properties of concrete are
also reviewed
22 Admixture
Admixture is used as an additional material which is added to concrete mixtures It is varying
widely in chemical composition from surfactants and soluble salts to polymers and insoluble
minerals The properties of concrete such as workability strength and durability can be
improved by adding admixtures to concrete batch (Monte rio amp Mehta 2006) Besides that
the use of admixture in concrete mixtures may also increase or decrease the cost of concrete
by lowering the required cement content changing the volume of the concrete mixture or
reducing the cost of concrete placing and finishing Thus admixture plays an important role
in concrete mixtures Admixture can be categorised into 2 categorise which is mineral
admixture (fly ash silica fume and others) and chemical admixture (air-entering agents
accelerators water-reducing admixtures However mineral admixtures are more emphasized
in this study and used as supplementary cementitious material for producing concrete
6
Mineral admixtures are categorised into 2 classifications which are natural materials and byshy
product materials Some mineral admixtures can be pozzolanic cementitious and however
others are both cementitious and pozzolanic (Monterio amp Mehta 2006) Natural materials are
defined as a material that has been treated for the only purpose of making a pozzolan
Generally the process involves crushing grinding and size separation occasionally it may
also include thermal activation On the other hand by-product materials are defined as a
material that is not the primary products which produced from industry It mayor may not
require any processing before use as mineral admixtures
However by-product materials are more highlighted in this study Consequently the physiGal
and chemical and mineralogical properties of palm oil fuel ash (PDF A) will be further
discussed in this study Besides that effect of PDF A on the mechanical properties of concrete
will be also discussed in this study
23 Types of Mineral Admixtures from By-product
A variety of by-product materials such as fly ash blast-furnace slag silica fume rice husk ash
and others have been commonly used as pozzolanic materials in concrete The utilization of
pozzolanic material not only enhances the properties of concrete but also protects the
environment
231 Fly Ash
According to Day (2006) fly ash is also known as pulverized fuel ash which is produced from
the combustion of coal in thermal power plants During combustion the mineral impurities
such as clays quartz and feldspar melt in suspension at the high temperature and float out
with the flue gas stream As the fused material rises it is transported to low temperature zones
7
allow it cools and then it solidifies as spherical particles of glass which are called fly ash This
fly ash is collected from the flue gas stream by mechanical separators electrostatic
precipitation or bag filters (Nawy 2008) Fly ash can be categorised into two different types
which are Class C and Class F (ASTM C 618-78) Class C ash is consists of high-calcium fly
ashes with carbon content less than 2 while Class F ash contains low-calcium fly ashes
with carbon content less than 5 but sometimes as high as 10 Class C ash is usually
obtained from burning sub-bituminous or lignite coals whereas Class F ashes are obtained
from burning bituminous or anthracite coals The chemical and physical properties of the ash
have significant impact on the performance properties between Class F and C ashes The
physical properties of fly ashes are depending to the source Fly ash is a fine-grained material
which contains spherical glassy particles The particles can be irregular or angular shapes and
its size is depending on the sources The particles of fly ash may be finer or coarser than
Portland cement particles On the other hand the mineralogical properties of fly ash are
significant influenced by both the type and source of fly ash Fly ash contains noncrystalline
particles or glass and a small quantity of crystalline material as result from the rapid cooling
ofburned coal in the power plant
232 Blast-Furnace Slag
Blast-furnace slag is a by-product of the production of iron (Nawy 2008) When it is quickly
cool down with water to glassy state and finely ground thus the property of latent
hydraulicity will be developed (Nawy 2008) Nowadays the use of blast-furnace slag as an
admixture in concrete is well established In the early 1970s glassy slag was produced by
using pelletizing process which uses much less water than granulation methods Firstly a
treatment with water sprays is used to expand the molten slag and then passed over a rotating
8
fInned drum Lastly the semi molten material is cooled and pelletized by throwing them into
the air
233 SUtea Fume
Silica fume is a byproduct of the production of metallic silicon or ferrosilicon alloys which is
produced by electric arc furnaces (Nawy 2008) The two main components such as the types
of alloy fonned and the composition of quartz and coal are commonly used in the electric arc
furnaces which are significantly influence the chemical composition of silica fume The
majority ofpublished data indicates that the utilization of silica fume in concrete must contain
at least 75 ferro silicon
234 Rice Husk Ash
Rice husk ash is a by-product of the agricultural industry which is produced from burning a
mixture of rice husk and eucalyptus bark by fluidized bed combustion process in a biomass
power plant It consists of high amount of Si02 Silica content in the ash increases with higher
the burning temperature Many researches described that rice husk ash consists of high
reactivity and pozzolanic property after burning process at controlled temperature Chemical
composition of rice husk ash is greatly influenced by the temperature during burning
processes
24 The PbysieaJ Properties of POFA
According to AbdullaH et al (2006) the burning temperature condition is one of factors that
significantly influence the physical properties of POFA Several of physical properties of
9
Wlground and ground POF A used in various studies are shown in Table 21 These all
properties ofunground and ground POFA are briefly discussed below
Table 21 Physical properties of unground and ground POF A (Safiuddin et al 2011)
Properties OPC Unground POFA Ground PO FA
Color Grey Light greywhitish Dark grey
Specific gravity 314-328 178-197 222-278
Median particle size dso(urn) 10-20 543-183 72-101
Passing through 45-urn sieve 56-588 97-99
( mass)
Specific surface area Blaine 314-358 796 882-1244
(m2kg)
Strength activity index () 786-115
SOWldness Le Chatelier 045-1 05-26
expansion (mm)
141 Color
UngroWld POF A is usually in light grey color as results from the unburnt carbon content left
at relatively low burning temperature The content of unburnt carbon becomes very low when
the burning temperature is high Besides that unground POF A can also be whitish color in the
absence of unburnt carbon (Abdullah et al 2006) On the other hand ground POF A is dark
grey color
10
141 Specific Gravity
The specific gravity of unground POFA is normally varies in the range of 178-197 From
Table 21 above it can be seen that the specific gravity of unground POF A is about 40
lower than the specific gravity of ope (Tay 1990) However the specific gravity of POF A is
increased and it is about in the range of 222-278 after the grinding process (Sata et al 2004
Tangchirapat et al 2009) It is because the particle size of POF A is reduced and then the
porosity also decreased as results from grinding processes
143 Particle Shape and Size
The particle shape and size of unground POF A is different as compare to ground POF A It
was found that the particle shape and size are mostly large spherical and porous as shown in
Figure 22 In contrast ground POF A is quite similar to Portland cement which crushed
particle is usually in irregular and angular shape as shown in Figure 21 amp 23 ( Chindaprasirt
et al 2007) The particle size of unground POFA is larger than OPC however the particle
size of ground POF A is smaller than OPe The typical particle size distributions of unground
and ground POF A and ope are shown in Figure 24 The median particle size of unground
POFA is about 543)lm -183)lm which is larger than ope which is in the range of I011m -20
1Jlll However the particle size of POFA is decreased to 72)lffi -lO1)lm after grinding
processes (Sata et al 2004 Chindaprasit et at 2008)
11
Figure 21 OPC (Chindaprasirt et ai 2007) Figure 22 Unground POFA (Jaturapitakkul
et ai 2007)
Figure 23 Ground POFA (Jaturapitakkul et ai 2007)
100 r==III~~iITinTI-1M-7I1
II
rriTiT11 Ground POFA JIl jill
90 ope mill J UOOUnd POFA t++tt+-l~I11H80 III IIT~+IIiI--+++IH
70 ~~t+~~UU~~~I IIIV-J~~U oo ~~U~~~Hm+M~~~I~~~
50 +-+tttlitl t-+-Ii+Itflt-+f+TMIlH-i++IHIt-I+tt+Ilt-i~ 1JlIIlt~ 40 +-r-lliM-=-+WII--l-+4R-++I r-H+fllf-++I I N+-i
~ ~~~I~~~~~J~Ir+~ 2o ~~~~~~~~~~~~~~~I I10 ~~~~~~A~~~_I_I~~~ o 1 w
001 01 10 00 1000 10000
Particle size (~m)
Figure 24 Particle size distribution of un ground and ground POFA and OPC (Sata et ai
2004)
12
Malaysia only (Zarina 2012) While the quantity of PO FA is rising annually its utilization is
limited and basically disposed of as a waste in landfills without any profitable return It can
also affect environmental problems such as health hazards and financial loss
13 Research Significance
There are several significances in this research project Firstly PDFA is incorporated as
supplementary cementing material in the concrete mix as to promote the use of agricultural
waste and create a more sustainable environment besides its own ability to improve strength
development of concrete Next it is also important that to obtain a mix proportion to produce
concrete incorporated with PDFA and studies the mechanical properties of concrete in term of
compressive strength and splitting tensile strength
14 Aim and Objectives
The aim of this research project is to conduct an experimental testing program to determine
the effects of PDFA fineness on the mechanical properties of concrete The objectives of the
research project are
1 To obtain a mix proportion containing different PDFA fineness which can achieve a
targeted strength of 30 Nmm2 at 28 days and slump of 60mm-180mm
II To study the mechanical properties of concr~te by using POFA with 3 different
fineness which are passing through 38wn 631m and 751m
1S Scope of work
The study focuses on the effect of PDFA fineness on the mechanical properties of concrete
The study only limited to test for three types of PDFA fineness which are 381m 631ffi and
3
75JlM with 15 PDFA replacement Three laboratories experimental tests is carried out
namely slump test compressive strength test and splitting tensile strength test The slump test
is carried out to detennine the workability of fresh concrete The concrete sample is cured in
the water and tested for 3 days 7 days and 28 days strength Consequently two mechanical
properties of concrete such as compressive strength and splitting tensile strength will be tested
in this study
16 Thesis Organisation
This report contains five chapters which are introduction literature review methodology
result and discussion and conclusion respectively
Chapter I discuss the general background of the research problem statement scope of work
aim and objectives and thesis significance
Chapter 2 discuss the admixture which is also one of the components of concrete mix Besides
that a general background for four types of pozzolanic materials such as fly ash blast furnace
slag silica fume and rice husk ash will be discussed in this chapter In addition the properties
of PDF A such as physical and chemical composition will also be discussed in this chapter
Moreover a previous study about the effect of PDF A on the mechanical properties of
concrete will be studied Lastly a previous research about the effect of fineness on properties
ofconcrete will be also discussed
Chapter 3 explain various laboratory tests will be carried out in this chapter In this chapter
three laboratory experiments will be conducted such as slump test compressive strength test
and splitting tensile strength test In addition experiment setups will be stated in this chapter
4
r-~-------~-----p~rKhldmat Mak1umat Akauemillt UNIVERSrn MALAYSIA SAltAWAIlt
Chapter 4 generally presents and discusses about the result of each laboratory tests that
conducted in tenn of compressive strength and splitting tensile strength
Chapter 5 conclude the whole study has been conducted A conclusion has been drawn with
relevant objectives stated based on the result achieved from this study Besides that there are
few recommendations will be listed in this chapter
5
CHAPTER 2
LITERATURE REVIEW
21 Introduction
During recent decades there are many researchers have been carried out for the use of
admixture in concrete mixture such as fly ash blast-furnace slag silica fume rice husk ash
and also palm oil fuel ash Besides that the properties of POF A are also briefly discussed and
previous study about the effects of POF A on the mechanical properties of concrete are also
reviewed Lastly previous study about the effects of fineness on the properties of concrete are
also reviewed
22 Admixture
Admixture is used as an additional material which is added to concrete mixtures It is varying
widely in chemical composition from surfactants and soluble salts to polymers and insoluble
minerals The properties of concrete such as workability strength and durability can be
improved by adding admixtures to concrete batch (Monte rio amp Mehta 2006) Besides that
the use of admixture in concrete mixtures may also increase or decrease the cost of concrete
by lowering the required cement content changing the volume of the concrete mixture or
reducing the cost of concrete placing and finishing Thus admixture plays an important role
in concrete mixtures Admixture can be categorised into 2 categorise which is mineral
admixture (fly ash silica fume and others) and chemical admixture (air-entering agents
accelerators water-reducing admixtures However mineral admixtures are more emphasized
in this study and used as supplementary cementitious material for producing concrete
6
Mineral admixtures are categorised into 2 classifications which are natural materials and byshy
product materials Some mineral admixtures can be pozzolanic cementitious and however
others are both cementitious and pozzolanic (Monterio amp Mehta 2006) Natural materials are
defined as a material that has been treated for the only purpose of making a pozzolan
Generally the process involves crushing grinding and size separation occasionally it may
also include thermal activation On the other hand by-product materials are defined as a
material that is not the primary products which produced from industry It mayor may not
require any processing before use as mineral admixtures
However by-product materials are more highlighted in this study Consequently the physiGal
and chemical and mineralogical properties of palm oil fuel ash (PDF A) will be further
discussed in this study Besides that effect of PDF A on the mechanical properties of concrete
will be also discussed in this study
23 Types of Mineral Admixtures from By-product
A variety of by-product materials such as fly ash blast-furnace slag silica fume rice husk ash
and others have been commonly used as pozzolanic materials in concrete The utilization of
pozzolanic material not only enhances the properties of concrete but also protects the
environment
231 Fly Ash
According to Day (2006) fly ash is also known as pulverized fuel ash which is produced from
the combustion of coal in thermal power plants During combustion the mineral impurities
such as clays quartz and feldspar melt in suspension at the high temperature and float out
with the flue gas stream As the fused material rises it is transported to low temperature zones
7
allow it cools and then it solidifies as spherical particles of glass which are called fly ash This
fly ash is collected from the flue gas stream by mechanical separators electrostatic
precipitation or bag filters (Nawy 2008) Fly ash can be categorised into two different types
which are Class C and Class F (ASTM C 618-78) Class C ash is consists of high-calcium fly
ashes with carbon content less than 2 while Class F ash contains low-calcium fly ashes
with carbon content less than 5 but sometimes as high as 10 Class C ash is usually
obtained from burning sub-bituminous or lignite coals whereas Class F ashes are obtained
from burning bituminous or anthracite coals The chemical and physical properties of the ash
have significant impact on the performance properties between Class F and C ashes The
physical properties of fly ashes are depending to the source Fly ash is a fine-grained material
which contains spherical glassy particles The particles can be irregular or angular shapes and
its size is depending on the sources The particles of fly ash may be finer or coarser than
Portland cement particles On the other hand the mineralogical properties of fly ash are
significant influenced by both the type and source of fly ash Fly ash contains noncrystalline
particles or glass and a small quantity of crystalline material as result from the rapid cooling
ofburned coal in the power plant
232 Blast-Furnace Slag
Blast-furnace slag is a by-product of the production of iron (Nawy 2008) When it is quickly
cool down with water to glassy state and finely ground thus the property of latent
hydraulicity will be developed (Nawy 2008) Nowadays the use of blast-furnace slag as an
admixture in concrete is well established In the early 1970s glassy slag was produced by
using pelletizing process which uses much less water than granulation methods Firstly a
treatment with water sprays is used to expand the molten slag and then passed over a rotating
8
fInned drum Lastly the semi molten material is cooled and pelletized by throwing them into
the air
233 SUtea Fume
Silica fume is a byproduct of the production of metallic silicon or ferrosilicon alloys which is
produced by electric arc furnaces (Nawy 2008) The two main components such as the types
of alloy fonned and the composition of quartz and coal are commonly used in the electric arc
furnaces which are significantly influence the chemical composition of silica fume The
majority ofpublished data indicates that the utilization of silica fume in concrete must contain
at least 75 ferro silicon
234 Rice Husk Ash
Rice husk ash is a by-product of the agricultural industry which is produced from burning a
mixture of rice husk and eucalyptus bark by fluidized bed combustion process in a biomass
power plant It consists of high amount of Si02 Silica content in the ash increases with higher
the burning temperature Many researches described that rice husk ash consists of high
reactivity and pozzolanic property after burning process at controlled temperature Chemical
composition of rice husk ash is greatly influenced by the temperature during burning
processes
24 The PbysieaJ Properties of POFA
According to AbdullaH et al (2006) the burning temperature condition is one of factors that
significantly influence the physical properties of POFA Several of physical properties of
9
Wlground and ground POF A used in various studies are shown in Table 21 These all
properties ofunground and ground POFA are briefly discussed below
Table 21 Physical properties of unground and ground POF A (Safiuddin et al 2011)
Properties OPC Unground POFA Ground PO FA
Color Grey Light greywhitish Dark grey
Specific gravity 314-328 178-197 222-278
Median particle size dso(urn) 10-20 543-183 72-101
Passing through 45-urn sieve 56-588 97-99
( mass)
Specific surface area Blaine 314-358 796 882-1244
(m2kg)
Strength activity index () 786-115
SOWldness Le Chatelier 045-1 05-26
expansion (mm)
141 Color
UngroWld POF A is usually in light grey color as results from the unburnt carbon content left
at relatively low burning temperature The content of unburnt carbon becomes very low when
the burning temperature is high Besides that unground POF A can also be whitish color in the
absence of unburnt carbon (Abdullah et al 2006) On the other hand ground POF A is dark
grey color
10
141 Specific Gravity
The specific gravity of unground POFA is normally varies in the range of 178-197 From
Table 21 above it can be seen that the specific gravity of unground POF A is about 40
lower than the specific gravity of ope (Tay 1990) However the specific gravity of POF A is
increased and it is about in the range of 222-278 after the grinding process (Sata et al 2004
Tangchirapat et al 2009) It is because the particle size of POF A is reduced and then the
porosity also decreased as results from grinding processes
143 Particle Shape and Size
The particle shape and size of unground POF A is different as compare to ground POF A It
was found that the particle shape and size are mostly large spherical and porous as shown in
Figure 22 In contrast ground POF A is quite similar to Portland cement which crushed
particle is usually in irregular and angular shape as shown in Figure 21 amp 23 ( Chindaprasirt
et al 2007) The particle size of unground POFA is larger than OPC however the particle
size of ground POF A is smaller than OPe The typical particle size distributions of unground
and ground POF A and ope are shown in Figure 24 The median particle size of unground
POFA is about 543)lm -183)lm which is larger than ope which is in the range of I011m -20
1Jlll However the particle size of POFA is decreased to 72)lffi -lO1)lm after grinding
processes (Sata et al 2004 Chindaprasit et at 2008)
11
Figure 21 OPC (Chindaprasirt et ai 2007) Figure 22 Unground POFA (Jaturapitakkul
et ai 2007)
Figure 23 Ground POFA (Jaturapitakkul et ai 2007)
100 r==III~~iITinTI-1M-7I1
II
rriTiT11 Ground POFA JIl jill
90 ope mill J UOOUnd POFA t++tt+-l~I11H80 III IIT~+IIiI--+++IH
70 ~~t+~~UU~~~I IIIV-J~~U oo ~~U~~~Hm+M~~~I~~~
50 +-+tttlitl t-+-Ii+Itflt-+f+TMIlH-i++IHIt-I+tt+Ilt-i~ 1JlIIlt~ 40 +-r-lliM-=-+WII--l-+4R-++I r-H+fllf-++I I N+-i
~ ~~~I~~~~~J~Ir+~ 2o ~~~~~~~~~~~~~~~I I10 ~~~~~~A~~~_I_I~~~ o 1 w
001 01 10 00 1000 10000
Particle size (~m)
Figure 24 Particle size distribution of un ground and ground POFA and OPC (Sata et ai
2004)
12
75JlM with 15 PDFA replacement Three laboratories experimental tests is carried out
namely slump test compressive strength test and splitting tensile strength test The slump test
is carried out to detennine the workability of fresh concrete The concrete sample is cured in
the water and tested for 3 days 7 days and 28 days strength Consequently two mechanical
properties of concrete such as compressive strength and splitting tensile strength will be tested
in this study
16 Thesis Organisation
This report contains five chapters which are introduction literature review methodology
result and discussion and conclusion respectively
Chapter I discuss the general background of the research problem statement scope of work
aim and objectives and thesis significance
Chapter 2 discuss the admixture which is also one of the components of concrete mix Besides
that a general background for four types of pozzolanic materials such as fly ash blast furnace
slag silica fume and rice husk ash will be discussed in this chapter In addition the properties
of PDF A such as physical and chemical composition will also be discussed in this chapter
Moreover a previous study about the effect of PDF A on the mechanical properties of
concrete will be studied Lastly a previous research about the effect of fineness on properties
ofconcrete will be also discussed
Chapter 3 explain various laboratory tests will be carried out in this chapter In this chapter
three laboratory experiments will be conducted such as slump test compressive strength test
and splitting tensile strength test In addition experiment setups will be stated in this chapter
4
r-~-------~-----p~rKhldmat Mak1umat Akauemillt UNIVERSrn MALAYSIA SAltAWAIlt
Chapter 4 generally presents and discusses about the result of each laboratory tests that
conducted in tenn of compressive strength and splitting tensile strength
Chapter 5 conclude the whole study has been conducted A conclusion has been drawn with
relevant objectives stated based on the result achieved from this study Besides that there are
few recommendations will be listed in this chapter
5
CHAPTER 2
LITERATURE REVIEW
21 Introduction
During recent decades there are many researchers have been carried out for the use of
admixture in concrete mixture such as fly ash blast-furnace slag silica fume rice husk ash
and also palm oil fuel ash Besides that the properties of POF A are also briefly discussed and
previous study about the effects of POF A on the mechanical properties of concrete are also
reviewed Lastly previous study about the effects of fineness on the properties of concrete are
also reviewed
22 Admixture
Admixture is used as an additional material which is added to concrete mixtures It is varying
widely in chemical composition from surfactants and soluble salts to polymers and insoluble
minerals The properties of concrete such as workability strength and durability can be
improved by adding admixtures to concrete batch (Monte rio amp Mehta 2006) Besides that
the use of admixture in concrete mixtures may also increase or decrease the cost of concrete
by lowering the required cement content changing the volume of the concrete mixture or
reducing the cost of concrete placing and finishing Thus admixture plays an important role
in concrete mixtures Admixture can be categorised into 2 categorise which is mineral
admixture (fly ash silica fume and others) and chemical admixture (air-entering agents
accelerators water-reducing admixtures However mineral admixtures are more emphasized
in this study and used as supplementary cementitious material for producing concrete
6
Mineral admixtures are categorised into 2 classifications which are natural materials and byshy
product materials Some mineral admixtures can be pozzolanic cementitious and however
others are both cementitious and pozzolanic (Monterio amp Mehta 2006) Natural materials are
defined as a material that has been treated for the only purpose of making a pozzolan
Generally the process involves crushing grinding and size separation occasionally it may
also include thermal activation On the other hand by-product materials are defined as a
material that is not the primary products which produced from industry It mayor may not
require any processing before use as mineral admixtures
However by-product materials are more highlighted in this study Consequently the physiGal
and chemical and mineralogical properties of palm oil fuel ash (PDF A) will be further
discussed in this study Besides that effect of PDF A on the mechanical properties of concrete
will be also discussed in this study
23 Types of Mineral Admixtures from By-product
A variety of by-product materials such as fly ash blast-furnace slag silica fume rice husk ash
and others have been commonly used as pozzolanic materials in concrete The utilization of
pozzolanic material not only enhances the properties of concrete but also protects the
environment
231 Fly Ash
According to Day (2006) fly ash is also known as pulverized fuel ash which is produced from
the combustion of coal in thermal power plants During combustion the mineral impurities
such as clays quartz and feldspar melt in suspension at the high temperature and float out
with the flue gas stream As the fused material rises it is transported to low temperature zones
7
allow it cools and then it solidifies as spherical particles of glass which are called fly ash This
fly ash is collected from the flue gas stream by mechanical separators electrostatic
precipitation or bag filters (Nawy 2008) Fly ash can be categorised into two different types
which are Class C and Class F (ASTM C 618-78) Class C ash is consists of high-calcium fly
ashes with carbon content less than 2 while Class F ash contains low-calcium fly ashes
with carbon content less than 5 but sometimes as high as 10 Class C ash is usually
obtained from burning sub-bituminous or lignite coals whereas Class F ashes are obtained
from burning bituminous or anthracite coals The chemical and physical properties of the ash
have significant impact on the performance properties between Class F and C ashes The
physical properties of fly ashes are depending to the source Fly ash is a fine-grained material
which contains spherical glassy particles The particles can be irregular or angular shapes and
its size is depending on the sources The particles of fly ash may be finer or coarser than
Portland cement particles On the other hand the mineralogical properties of fly ash are
significant influenced by both the type and source of fly ash Fly ash contains noncrystalline
particles or glass and a small quantity of crystalline material as result from the rapid cooling
ofburned coal in the power plant
232 Blast-Furnace Slag
Blast-furnace slag is a by-product of the production of iron (Nawy 2008) When it is quickly
cool down with water to glassy state and finely ground thus the property of latent
hydraulicity will be developed (Nawy 2008) Nowadays the use of blast-furnace slag as an
admixture in concrete is well established In the early 1970s glassy slag was produced by
using pelletizing process which uses much less water than granulation methods Firstly a
treatment with water sprays is used to expand the molten slag and then passed over a rotating
8
fInned drum Lastly the semi molten material is cooled and pelletized by throwing them into
the air
233 SUtea Fume
Silica fume is a byproduct of the production of metallic silicon or ferrosilicon alloys which is
produced by electric arc furnaces (Nawy 2008) The two main components such as the types
of alloy fonned and the composition of quartz and coal are commonly used in the electric arc
furnaces which are significantly influence the chemical composition of silica fume The
majority ofpublished data indicates that the utilization of silica fume in concrete must contain
at least 75 ferro silicon
234 Rice Husk Ash
Rice husk ash is a by-product of the agricultural industry which is produced from burning a
mixture of rice husk and eucalyptus bark by fluidized bed combustion process in a biomass
power plant It consists of high amount of Si02 Silica content in the ash increases with higher
the burning temperature Many researches described that rice husk ash consists of high
reactivity and pozzolanic property after burning process at controlled temperature Chemical
composition of rice husk ash is greatly influenced by the temperature during burning
processes
24 The PbysieaJ Properties of POFA
According to AbdullaH et al (2006) the burning temperature condition is one of factors that
significantly influence the physical properties of POFA Several of physical properties of
9
Wlground and ground POF A used in various studies are shown in Table 21 These all
properties ofunground and ground POFA are briefly discussed below
Table 21 Physical properties of unground and ground POF A (Safiuddin et al 2011)
Properties OPC Unground POFA Ground PO FA
Color Grey Light greywhitish Dark grey
Specific gravity 314-328 178-197 222-278
Median particle size dso(urn) 10-20 543-183 72-101
Passing through 45-urn sieve 56-588 97-99
( mass)
Specific surface area Blaine 314-358 796 882-1244
(m2kg)
Strength activity index () 786-115
SOWldness Le Chatelier 045-1 05-26
expansion (mm)
141 Color
UngroWld POF A is usually in light grey color as results from the unburnt carbon content left
at relatively low burning temperature The content of unburnt carbon becomes very low when
the burning temperature is high Besides that unground POF A can also be whitish color in the
absence of unburnt carbon (Abdullah et al 2006) On the other hand ground POF A is dark
grey color
10
141 Specific Gravity
The specific gravity of unground POFA is normally varies in the range of 178-197 From
Table 21 above it can be seen that the specific gravity of unground POF A is about 40
lower than the specific gravity of ope (Tay 1990) However the specific gravity of POF A is
increased and it is about in the range of 222-278 after the grinding process (Sata et al 2004
Tangchirapat et al 2009) It is because the particle size of POF A is reduced and then the
porosity also decreased as results from grinding processes
143 Particle Shape and Size
The particle shape and size of unground POF A is different as compare to ground POF A It
was found that the particle shape and size are mostly large spherical and porous as shown in
Figure 22 In contrast ground POF A is quite similar to Portland cement which crushed
particle is usually in irregular and angular shape as shown in Figure 21 amp 23 ( Chindaprasirt
et al 2007) The particle size of unground POFA is larger than OPC however the particle
size of ground POF A is smaller than OPe The typical particle size distributions of unground
and ground POF A and ope are shown in Figure 24 The median particle size of unground
POFA is about 543)lm -183)lm which is larger than ope which is in the range of I011m -20
1Jlll However the particle size of POFA is decreased to 72)lffi -lO1)lm after grinding
processes (Sata et al 2004 Chindaprasit et at 2008)
11
Figure 21 OPC (Chindaprasirt et ai 2007) Figure 22 Unground POFA (Jaturapitakkul
et ai 2007)
Figure 23 Ground POFA (Jaturapitakkul et ai 2007)
100 r==III~~iITinTI-1M-7I1
II
rriTiT11 Ground POFA JIl jill
90 ope mill J UOOUnd POFA t++tt+-l~I11H80 III IIT~+IIiI--+++IH
70 ~~t+~~UU~~~I IIIV-J~~U oo ~~U~~~Hm+M~~~I~~~
50 +-+tttlitl t-+-Ii+Itflt-+f+TMIlH-i++IHIt-I+tt+Ilt-i~ 1JlIIlt~ 40 +-r-lliM-=-+WII--l-+4R-++I r-H+fllf-++I I N+-i
~ ~~~I~~~~~J~Ir+~ 2o ~~~~~~~~~~~~~~~I I10 ~~~~~~A~~~_I_I~~~ o 1 w
001 01 10 00 1000 10000
Particle size (~m)
Figure 24 Particle size distribution of un ground and ground POFA and OPC (Sata et ai
2004)
12
r-~-------~-----p~rKhldmat Mak1umat Akauemillt UNIVERSrn MALAYSIA SAltAWAIlt
Chapter 4 generally presents and discusses about the result of each laboratory tests that
conducted in tenn of compressive strength and splitting tensile strength
Chapter 5 conclude the whole study has been conducted A conclusion has been drawn with
relevant objectives stated based on the result achieved from this study Besides that there are
few recommendations will be listed in this chapter
5
CHAPTER 2
LITERATURE REVIEW
21 Introduction
During recent decades there are many researchers have been carried out for the use of
admixture in concrete mixture such as fly ash blast-furnace slag silica fume rice husk ash
and also palm oil fuel ash Besides that the properties of POF A are also briefly discussed and
previous study about the effects of POF A on the mechanical properties of concrete are also
reviewed Lastly previous study about the effects of fineness on the properties of concrete are
also reviewed
22 Admixture
Admixture is used as an additional material which is added to concrete mixtures It is varying
widely in chemical composition from surfactants and soluble salts to polymers and insoluble
minerals The properties of concrete such as workability strength and durability can be
improved by adding admixtures to concrete batch (Monte rio amp Mehta 2006) Besides that
the use of admixture in concrete mixtures may also increase or decrease the cost of concrete
by lowering the required cement content changing the volume of the concrete mixture or
reducing the cost of concrete placing and finishing Thus admixture plays an important role
in concrete mixtures Admixture can be categorised into 2 categorise which is mineral
admixture (fly ash silica fume and others) and chemical admixture (air-entering agents
accelerators water-reducing admixtures However mineral admixtures are more emphasized
in this study and used as supplementary cementitious material for producing concrete
6
Mineral admixtures are categorised into 2 classifications which are natural materials and byshy
product materials Some mineral admixtures can be pozzolanic cementitious and however
others are both cementitious and pozzolanic (Monterio amp Mehta 2006) Natural materials are
defined as a material that has been treated for the only purpose of making a pozzolan
Generally the process involves crushing grinding and size separation occasionally it may
also include thermal activation On the other hand by-product materials are defined as a
material that is not the primary products which produced from industry It mayor may not
require any processing before use as mineral admixtures
However by-product materials are more highlighted in this study Consequently the physiGal
and chemical and mineralogical properties of palm oil fuel ash (PDF A) will be further
discussed in this study Besides that effect of PDF A on the mechanical properties of concrete
will be also discussed in this study
23 Types of Mineral Admixtures from By-product
A variety of by-product materials such as fly ash blast-furnace slag silica fume rice husk ash
and others have been commonly used as pozzolanic materials in concrete The utilization of
pozzolanic material not only enhances the properties of concrete but also protects the
environment
231 Fly Ash
According to Day (2006) fly ash is also known as pulverized fuel ash which is produced from
the combustion of coal in thermal power plants During combustion the mineral impurities
such as clays quartz and feldspar melt in suspension at the high temperature and float out
with the flue gas stream As the fused material rises it is transported to low temperature zones
7
allow it cools and then it solidifies as spherical particles of glass which are called fly ash This
fly ash is collected from the flue gas stream by mechanical separators electrostatic
precipitation or bag filters (Nawy 2008) Fly ash can be categorised into two different types
which are Class C and Class F (ASTM C 618-78) Class C ash is consists of high-calcium fly
ashes with carbon content less than 2 while Class F ash contains low-calcium fly ashes
with carbon content less than 5 but sometimes as high as 10 Class C ash is usually
obtained from burning sub-bituminous or lignite coals whereas Class F ashes are obtained
from burning bituminous or anthracite coals The chemical and physical properties of the ash
have significant impact on the performance properties between Class F and C ashes The
physical properties of fly ashes are depending to the source Fly ash is a fine-grained material
which contains spherical glassy particles The particles can be irregular or angular shapes and
its size is depending on the sources The particles of fly ash may be finer or coarser than
Portland cement particles On the other hand the mineralogical properties of fly ash are
significant influenced by both the type and source of fly ash Fly ash contains noncrystalline
particles or glass and a small quantity of crystalline material as result from the rapid cooling
ofburned coal in the power plant
232 Blast-Furnace Slag
Blast-furnace slag is a by-product of the production of iron (Nawy 2008) When it is quickly
cool down with water to glassy state and finely ground thus the property of latent
hydraulicity will be developed (Nawy 2008) Nowadays the use of blast-furnace slag as an
admixture in concrete is well established In the early 1970s glassy slag was produced by
using pelletizing process which uses much less water than granulation methods Firstly a
treatment with water sprays is used to expand the molten slag and then passed over a rotating
8
fInned drum Lastly the semi molten material is cooled and pelletized by throwing them into
the air
233 SUtea Fume
Silica fume is a byproduct of the production of metallic silicon or ferrosilicon alloys which is
produced by electric arc furnaces (Nawy 2008) The two main components such as the types
of alloy fonned and the composition of quartz and coal are commonly used in the electric arc
furnaces which are significantly influence the chemical composition of silica fume The
majority ofpublished data indicates that the utilization of silica fume in concrete must contain
at least 75 ferro silicon
234 Rice Husk Ash
Rice husk ash is a by-product of the agricultural industry which is produced from burning a
mixture of rice husk and eucalyptus bark by fluidized bed combustion process in a biomass
power plant It consists of high amount of Si02 Silica content in the ash increases with higher
the burning temperature Many researches described that rice husk ash consists of high
reactivity and pozzolanic property after burning process at controlled temperature Chemical
composition of rice husk ash is greatly influenced by the temperature during burning
processes
24 The PbysieaJ Properties of POFA
According to AbdullaH et al (2006) the burning temperature condition is one of factors that
significantly influence the physical properties of POFA Several of physical properties of
9
Wlground and ground POF A used in various studies are shown in Table 21 These all
properties ofunground and ground POFA are briefly discussed below
Table 21 Physical properties of unground and ground POF A (Safiuddin et al 2011)
Properties OPC Unground POFA Ground PO FA
Color Grey Light greywhitish Dark grey
Specific gravity 314-328 178-197 222-278
Median particle size dso(urn) 10-20 543-183 72-101
Passing through 45-urn sieve 56-588 97-99
( mass)
Specific surface area Blaine 314-358 796 882-1244
(m2kg)
Strength activity index () 786-115
SOWldness Le Chatelier 045-1 05-26
expansion (mm)
141 Color
UngroWld POF A is usually in light grey color as results from the unburnt carbon content left
at relatively low burning temperature The content of unburnt carbon becomes very low when
the burning temperature is high Besides that unground POF A can also be whitish color in the
absence of unburnt carbon (Abdullah et al 2006) On the other hand ground POF A is dark
grey color
10
141 Specific Gravity
The specific gravity of unground POFA is normally varies in the range of 178-197 From
Table 21 above it can be seen that the specific gravity of unground POF A is about 40
lower than the specific gravity of ope (Tay 1990) However the specific gravity of POF A is
increased and it is about in the range of 222-278 after the grinding process (Sata et al 2004
Tangchirapat et al 2009) It is because the particle size of POF A is reduced and then the
porosity also decreased as results from grinding processes
143 Particle Shape and Size
The particle shape and size of unground POF A is different as compare to ground POF A It
was found that the particle shape and size are mostly large spherical and porous as shown in
Figure 22 In contrast ground POF A is quite similar to Portland cement which crushed
particle is usually in irregular and angular shape as shown in Figure 21 amp 23 ( Chindaprasirt
et al 2007) The particle size of unground POFA is larger than OPC however the particle
size of ground POF A is smaller than OPe The typical particle size distributions of unground
and ground POF A and ope are shown in Figure 24 The median particle size of unground
POFA is about 543)lm -183)lm which is larger than ope which is in the range of I011m -20
1Jlll However the particle size of POFA is decreased to 72)lffi -lO1)lm after grinding
processes (Sata et al 2004 Chindaprasit et at 2008)
11
Figure 21 OPC (Chindaprasirt et ai 2007) Figure 22 Unground POFA (Jaturapitakkul
et ai 2007)
Figure 23 Ground POFA (Jaturapitakkul et ai 2007)
100 r==III~~iITinTI-1M-7I1
II
rriTiT11 Ground POFA JIl jill
90 ope mill J UOOUnd POFA t++tt+-l~I11H80 III IIT~+IIiI--+++IH
70 ~~t+~~UU~~~I IIIV-J~~U oo ~~U~~~Hm+M~~~I~~~
50 +-+tttlitl t-+-Ii+Itflt-+f+TMIlH-i++IHIt-I+tt+Ilt-i~ 1JlIIlt~ 40 +-r-lliM-=-+WII--l-+4R-++I r-H+fllf-++I I N+-i
~ ~~~I~~~~~J~Ir+~ 2o ~~~~~~~~~~~~~~~I I10 ~~~~~~A~~~_I_I~~~ o 1 w
001 01 10 00 1000 10000
Particle size (~m)
Figure 24 Particle size distribution of un ground and ground POFA and OPC (Sata et ai
2004)
12
CHAPTER 2
LITERATURE REVIEW
21 Introduction
During recent decades there are many researchers have been carried out for the use of
admixture in concrete mixture such as fly ash blast-furnace slag silica fume rice husk ash
and also palm oil fuel ash Besides that the properties of POF A are also briefly discussed and
previous study about the effects of POF A on the mechanical properties of concrete are also
reviewed Lastly previous study about the effects of fineness on the properties of concrete are
also reviewed
22 Admixture
Admixture is used as an additional material which is added to concrete mixtures It is varying
widely in chemical composition from surfactants and soluble salts to polymers and insoluble
minerals The properties of concrete such as workability strength and durability can be
improved by adding admixtures to concrete batch (Monte rio amp Mehta 2006) Besides that
the use of admixture in concrete mixtures may also increase or decrease the cost of concrete
by lowering the required cement content changing the volume of the concrete mixture or
reducing the cost of concrete placing and finishing Thus admixture plays an important role
in concrete mixtures Admixture can be categorised into 2 categorise which is mineral
admixture (fly ash silica fume and others) and chemical admixture (air-entering agents
accelerators water-reducing admixtures However mineral admixtures are more emphasized
in this study and used as supplementary cementitious material for producing concrete
6
Mineral admixtures are categorised into 2 classifications which are natural materials and byshy
product materials Some mineral admixtures can be pozzolanic cementitious and however
others are both cementitious and pozzolanic (Monterio amp Mehta 2006) Natural materials are
defined as a material that has been treated for the only purpose of making a pozzolan
Generally the process involves crushing grinding and size separation occasionally it may
also include thermal activation On the other hand by-product materials are defined as a
material that is not the primary products which produced from industry It mayor may not
require any processing before use as mineral admixtures
However by-product materials are more highlighted in this study Consequently the physiGal
and chemical and mineralogical properties of palm oil fuel ash (PDF A) will be further
discussed in this study Besides that effect of PDF A on the mechanical properties of concrete
will be also discussed in this study
23 Types of Mineral Admixtures from By-product
A variety of by-product materials such as fly ash blast-furnace slag silica fume rice husk ash
and others have been commonly used as pozzolanic materials in concrete The utilization of
pozzolanic material not only enhances the properties of concrete but also protects the
environment
231 Fly Ash
According to Day (2006) fly ash is also known as pulverized fuel ash which is produced from
the combustion of coal in thermal power plants During combustion the mineral impurities
such as clays quartz and feldspar melt in suspension at the high temperature and float out
with the flue gas stream As the fused material rises it is transported to low temperature zones
7
allow it cools and then it solidifies as spherical particles of glass which are called fly ash This
fly ash is collected from the flue gas stream by mechanical separators electrostatic
precipitation or bag filters (Nawy 2008) Fly ash can be categorised into two different types
which are Class C and Class F (ASTM C 618-78) Class C ash is consists of high-calcium fly
ashes with carbon content less than 2 while Class F ash contains low-calcium fly ashes
with carbon content less than 5 but sometimes as high as 10 Class C ash is usually
obtained from burning sub-bituminous or lignite coals whereas Class F ashes are obtained
from burning bituminous or anthracite coals The chemical and physical properties of the ash
have significant impact on the performance properties between Class F and C ashes The
physical properties of fly ashes are depending to the source Fly ash is a fine-grained material
which contains spherical glassy particles The particles can be irregular or angular shapes and
its size is depending on the sources The particles of fly ash may be finer or coarser than
Portland cement particles On the other hand the mineralogical properties of fly ash are
significant influenced by both the type and source of fly ash Fly ash contains noncrystalline
particles or glass and a small quantity of crystalline material as result from the rapid cooling
ofburned coal in the power plant
232 Blast-Furnace Slag
Blast-furnace slag is a by-product of the production of iron (Nawy 2008) When it is quickly
cool down with water to glassy state and finely ground thus the property of latent
hydraulicity will be developed (Nawy 2008) Nowadays the use of blast-furnace slag as an
admixture in concrete is well established In the early 1970s glassy slag was produced by
using pelletizing process which uses much less water than granulation methods Firstly a
treatment with water sprays is used to expand the molten slag and then passed over a rotating
8
fInned drum Lastly the semi molten material is cooled and pelletized by throwing them into
the air
233 SUtea Fume
Silica fume is a byproduct of the production of metallic silicon or ferrosilicon alloys which is
produced by electric arc furnaces (Nawy 2008) The two main components such as the types
of alloy fonned and the composition of quartz and coal are commonly used in the electric arc
furnaces which are significantly influence the chemical composition of silica fume The
majority ofpublished data indicates that the utilization of silica fume in concrete must contain
at least 75 ferro silicon
234 Rice Husk Ash
Rice husk ash is a by-product of the agricultural industry which is produced from burning a
mixture of rice husk and eucalyptus bark by fluidized bed combustion process in a biomass
power plant It consists of high amount of Si02 Silica content in the ash increases with higher
the burning temperature Many researches described that rice husk ash consists of high
reactivity and pozzolanic property after burning process at controlled temperature Chemical
composition of rice husk ash is greatly influenced by the temperature during burning
processes
24 The PbysieaJ Properties of POFA
According to AbdullaH et al (2006) the burning temperature condition is one of factors that
significantly influence the physical properties of POFA Several of physical properties of
9
Wlground and ground POF A used in various studies are shown in Table 21 These all
properties ofunground and ground POFA are briefly discussed below
Table 21 Physical properties of unground and ground POF A (Safiuddin et al 2011)
Properties OPC Unground POFA Ground PO FA
Color Grey Light greywhitish Dark grey
Specific gravity 314-328 178-197 222-278
Median particle size dso(urn) 10-20 543-183 72-101
Passing through 45-urn sieve 56-588 97-99
( mass)
Specific surface area Blaine 314-358 796 882-1244
(m2kg)
Strength activity index () 786-115
SOWldness Le Chatelier 045-1 05-26
expansion (mm)
141 Color
UngroWld POF A is usually in light grey color as results from the unburnt carbon content left
at relatively low burning temperature The content of unburnt carbon becomes very low when
the burning temperature is high Besides that unground POF A can also be whitish color in the
absence of unburnt carbon (Abdullah et al 2006) On the other hand ground POF A is dark
grey color
10
141 Specific Gravity
The specific gravity of unground POFA is normally varies in the range of 178-197 From
Table 21 above it can be seen that the specific gravity of unground POF A is about 40
lower than the specific gravity of ope (Tay 1990) However the specific gravity of POF A is
increased and it is about in the range of 222-278 after the grinding process (Sata et al 2004
Tangchirapat et al 2009) It is because the particle size of POF A is reduced and then the
porosity also decreased as results from grinding processes
143 Particle Shape and Size
The particle shape and size of unground POF A is different as compare to ground POF A It
was found that the particle shape and size are mostly large spherical and porous as shown in
Figure 22 In contrast ground POF A is quite similar to Portland cement which crushed
particle is usually in irregular and angular shape as shown in Figure 21 amp 23 ( Chindaprasirt
et al 2007) The particle size of unground POFA is larger than OPC however the particle
size of ground POF A is smaller than OPe The typical particle size distributions of unground
and ground POF A and ope are shown in Figure 24 The median particle size of unground
POFA is about 543)lm -183)lm which is larger than ope which is in the range of I011m -20
1Jlll However the particle size of POFA is decreased to 72)lffi -lO1)lm after grinding
processes (Sata et al 2004 Chindaprasit et at 2008)
11
Figure 21 OPC (Chindaprasirt et ai 2007) Figure 22 Unground POFA (Jaturapitakkul
et ai 2007)
Figure 23 Ground POFA (Jaturapitakkul et ai 2007)
100 r==III~~iITinTI-1M-7I1
II
rriTiT11 Ground POFA JIl jill
90 ope mill J UOOUnd POFA t++tt+-l~I11H80 III IIT~+IIiI--+++IH
70 ~~t+~~UU~~~I IIIV-J~~U oo ~~U~~~Hm+M~~~I~~~
50 +-+tttlitl t-+-Ii+Itflt-+f+TMIlH-i++IHIt-I+tt+Ilt-i~ 1JlIIlt~ 40 +-r-lliM-=-+WII--l-+4R-++I r-H+fllf-++I I N+-i
~ ~~~I~~~~~J~Ir+~ 2o ~~~~~~~~~~~~~~~I I10 ~~~~~~A~~~_I_I~~~ o 1 w
001 01 10 00 1000 10000
Particle size (~m)
Figure 24 Particle size distribution of un ground and ground POFA and OPC (Sata et ai
2004)
12
Mineral admixtures are categorised into 2 classifications which are natural materials and byshy
product materials Some mineral admixtures can be pozzolanic cementitious and however
others are both cementitious and pozzolanic (Monterio amp Mehta 2006) Natural materials are
defined as a material that has been treated for the only purpose of making a pozzolan
Generally the process involves crushing grinding and size separation occasionally it may
also include thermal activation On the other hand by-product materials are defined as a
material that is not the primary products which produced from industry It mayor may not
require any processing before use as mineral admixtures
However by-product materials are more highlighted in this study Consequently the physiGal
and chemical and mineralogical properties of palm oil fuel ash (PDF A) will be further
discussed in this study Besides that effect of PDF A on the mechanical properties of concrete
will be also discussed in this study
23 Types of Mineral Admixtures from By-product
A variety of by-product materials such as fly ash blast-furnace slag silica fume rice husk ash
and others have been commonly used as pozzolanic materials in concrete The utilization of
pozzolanic material not only enhances the properties of concrete but also protects the
environment
231 Fly Ash
According to Day (2006) fly ash is also known as pulverized fuel ash which is produced from
the combustion of coal in thermal power plants During combustion the mineral impurities
such as clays quartz and feldspar melt in suspension at the high temperature and float out
with the flue gas stream As the fused material rises it is transported to low temperature zones
7
allow it cools and then it solidifies as spherical particles of glass which are called fly ash This
fly ash is collected from the flue gas stream by mechanical separators electrostatic
precipitation or bag filters (Nawy 2008) Fly ash can be categorised into two different types
which are Class C and Class F (ASTM C 618-78) Class C ash is consists of high-calcium fly
ashes with carbon content less than 2 while Class F ash contains low-calcium fly ashes
with carbon content less than 5 but sometimes as high as 10 Class C ash is usually
obtained from burning sub-bituminous or lignite coals whereas Class F ashes are obtained
from burning bituminous or anthracite coals The chemical and physical properties of the ash
have significant impact on the performance properties between Class F and C ashes The
physical properties of fly ashes are depending to the source Fly ash is a fine-grained material
which contains spherical glassy particles The particles can be irregular or angular shapes and
its size is depending on the sources The particles of fly ash may be finer or coarser than
Portland cement particles On the other hand the mineralogical properties of fly ash are
significant influenced by both the type and source of fly ash Fly ash contains noncrystalline
particles or glass and a small quantity of crystalline material as result from the rapid cooling
ofburned coal in the power plant
232 Blast-Furnace Slag
Blast-furnace slag is a by-product of the production of iron (Nawy 2008) When it is quickly
cool down with water to glassy state and finely ground thus the property of latent
hydraulicity will be developed (Nawy 2008) Nowadays the use of blast-furnace slag as an
admixture in concrete is well established In the early 1970s glassy slag was produced by
using pelletizing process which uses much less water than granulation methods Firstly a
treatment with water sprays is used to expand the molten slag and then passed over a rotating
8
fInned drum Lastly the semi molten material is cooled and pelletized by throwing them into
the air
233 SUtea Fume
Silica fume is a byproduct of the production of metallic silicon or ferrosilicon alloys which is
produced by electric arc furnaces (Nawy 2008) The two main components such as the types
of alloy fonned and the composition of quartz and coal are commonly used in the electric arc
furnaces which are significantly influence the chemical composition of silica fume The
majority ofpublished data indicates that the utilization of silica fume in concrete must contain
at least 75 ferro silicon
234 Rice Husk Ash
Rice husk ash is a by-product of the agricultural industry which is produced from burning a
mixture of rice husk and eucalyptus bark by fluidized bed combustion process in a biomass
power plant It consists of high amount of Si02 Silica content in the ash increases with higher
the burning temperature Many researches described that rice husk ash consists of high
reactivity and pozzolanic property after burning process at controlled temperature Chemical
composition of rice husk ash is greatly influenced by the temperature during burning
processes
24 The PbysieaJ Properties of POFA
According to AbdullaH et al (2006) the burning temperature condition is one of factors that
significantly influence the physical properties of POFA Several of physical properties of
9
Wlground and ground POF A used in various studies are shown in Table 21 These all
properties ofunground and ground POFA are briefly discussed below
Table 21 Physical properties of unground and ground POF A (Safiuddin et al 2011)
Properties OPC Unground POFA Ground PO FA
Color Grey Light greywhitish Dark grey
Specific gravity 314-328 178-197 222-278
Median particle size dso(urn) 10-20 543-183 72-101
Passing through 45-urn sieve 56-588 97-99
( mass)
Specific surface area Blaine 314-358 796 882-1244
(m2kg)
Strength activity index () 786-115
SOWldness Le Chatelier 045-1 05-26
expansion (mm)
141 Color
UngroWld POF A is usually in light grey color as results from the unburnt carbon content left
at relatively low burning temperature The content of unburnt carbon becomes very low when
the burning temperature is high Besides that unground POF A can also be whitish color in the
absence of unburnt carbon (Abdullah et al 2006) On the other hand ground POF A is dark
grey color
10
141 Specific Gravity
The specific gravity of unground POFA is normally varies in the range of 178-197 From
Table 21 above it can be seen that the specific gravity of unground POF A is about 40
lower than the specific gravity of ope (Tay 1990) However the specific gravity of POF A is
increased and it is about in the range of 222-278 after the grinding process (Sata et al 2004
Tangchirapat et al 2009) It is because the particle size of POF A is reduced and then the
porosity also decreased as results from grinding processes
143 Particle Shape and Size
The particle shape and size of unground POF A is different as compare to ground POF A It
was found that the particle shape and size are mostly large spherical and porous as shown in
Figure 22 In contrast ground POF A is quite similar to Portland cement which crushed
particle is usually in irregular and angular shape as shown in Figure 21 amp 23 ( Chindaprasirt
et al 2007) The particle size of unground POFA is larger than OPC however the particle
size of ground POF A is smaller than OPe The typical particle size distributions of unground
and ground POF A and ope are shown in Figure 24 The median particle size of unground
POFA is about 543)lm -183)lm which is larger than ope which is in the range of I011m -20
1Jlll However the particle size of POFA is decreased to 72)lffi -lO1)lm after grinding
processes (Sata et al 2004 Chindaprasit et at 2008)
11
Figure 21 OPC (Chindaprasirt et ai 2007) Figure 22 Unground POFA (Jaturapitakkul
et ai 2007)
Figure 23 Ground POFA (Jaturapitakkul et ai 2007)
100 r==III~~iITinTI-1M-7I1
II
rriTiT11 Ground POFA JIl jill
90 ope mill J UOOUnd POFA t++tt+-l~I11H80 III IIT~+IIiI--+++IH
70 ~~t+~~UU~~~I IIIV-J~~U oo ~~U~~~Hm+M~~~I~~~
50 +-+tttlitl t-+-Ii+Itflt-+f+TMIlH-i++IHIt-I+tt+Ilt-i~ 1JlIIlt~ 40 +-r-lliM-=-+WII--l-+4R-++I r-H+fllf-++I I N+-i
~ ~~~I~~~~~J~Ir+~ 2o ~~~~~~~~~~~~~~~I I10 ~~~~~~A~~~_I_I~~~ o 1 w
001 01 10 00 1000 10000
Particle size (~m)
Figure 24 Particle size distribution of un ground and ground POFA and OPC (Sata et ai
2004)
12
allow it cools and then it solidifies as spherical particles of glass which are called fly ash This
fly ash is collected from the flue gas stream by mechanical separators electrostatic
precipitation or bag filters (Nawy 2008) Fly ash can be categorised into two different types
which are Class C and Class F (ASTM C 618-78) Class C ash is consists of high-calcium fly
ashes with carbon content less than 2 while Class F ash contains low-calcium fly ashes
with carbon content less than 5 but sometimes as high as 10 Class C ash is usually
obtained from burning sub-bituminous or lignite coals whereas Class F ashes are obtained
from burning bituminous or anthracite coals The chemical and physical properties of the ash
have significant impact on the performance properties between Class F and C ashes The
physical properties of fly ashes are depending to the source Fly ash is a fine-grained material
which contains spherical glassy particles The particles can be irregular or angular shapes and
its size is depending on the sources The particles of fly ash may be finer or coarser than
Portland cement particles On the other hand the mineralogical properties of fly ash are
significant influenced by both the type and source of fly ash Fly ash contains noncrystalline
particles or glass and a small quantity of crystalline material as result from the rapid cooling
ofburned coal in the power plant
232 Blast-Furnace Slag
Blast-furnace slag is a by-product of the production of iron (Nawy 2008) When it is quickly
cool down with water to glassy state and finely ground thus the property of latent
hydraulicity will be developed (Nawy 2008) Nowadays the use of blast-furnace slag as an
admixture in concrete is well established In the early 1970s glassy slag was produced by
using pelletizing process which uses much less water than granulation methods Firstly a
treatment with water sprays is used to expand the molten slag and then passed over a rotating
8
fInned drum Lastly the semi molten material is cooled and pelletized by throwing them into
the air
233 SUtea Fume
Silica fume is a byproduct of the production of metallic silicon or ferrosilicon alloys which is
produced by electric arc furnaces (Nawy 2008) The two main components such as the types
of alloy fonned and the composition of quartz and coal are commonly used in the electric arc
furnaces which are significantly influence the chemical composition of silica fume The
majority ofpublished data indicates that the utilization of silica fume in concrete must contain
at least 75 ferro silicon
234 Rice Husk Ash
Rice husk ash is a by-product of the agricultural industry which is produced from burning a
mixture of rice husk and eucalyptus bark by fluidized bed combustion process in a biomass
power plant It consists of high amount of Si02 Silica content in the ash increases with higher
the burning temperature Many researches described that rice husk ash consists of high
reactivity and pozzolanic property after burning process at controlled temperature Chemical
composition of rice husk ash is greatly influenced by the temperature during burning
processes
24 The PbysieaJ Properties of POFA
According to AbdullaH et al (2006) the burning temperature condition is one of factors that
significantly influence the physical properties of POFA Several of physical properties of
9
Wlground and ground POF A used in various studies are shown in Table 21 These all
properties ofunground and ground POFA are briefly discussed below
Table 21 Physical properties of unground and ground POF A (Safiuddin et al 2011)
Properties OPC Unground POFA Ground PO FA
Color Grey Light greywhitish Dark grey
Specific gravity 314-328 178-197 222-278
Median particle size dso(urn) 10-20 543-183 72-101
Passing through 45-urn sieve 56-588 97-99
( mass)
Specific surface area Blaine 314-358 796 882-1244
(m2kg)
Strength activity index () 786-115
SOWldness Le Chatelier 045-1 05-26
expansion (mm)
141 Color
UngroWld POF A is usually in light grey color as results from the unburnt carbon content left
at relatively low burning temperature The content of unburnt carbon becomes very low when
the burning temperature is high Besides that unground POF A can also be whitish color in the
absence of unburnt carbon (Abdullah et al 2006) On the other hand ground POF A is dark
grey color
10
141 Specific Gravity
The specific gravity of unground POFA is normally varies in the range of 178-197 From
Table 21 above it can be seen that the specific gravity of unground POF A is about 40
lower than the specific gravity of ope (Tay 1990) However the specific gravity of POF A is
increased and it is about in the range of 222-278 after the grinding process (Sata et al 2004
Tangchirapat et al 2009) It is because the particle size of POF A is reduced and then the
porosity also decreased as results from grinding processes
143 Particle Shape and Size
The particle shape and size of unground POF A is different as compare to ground POF A It
was found that the particle shape and size are mostly large spherical and porous as shown in
Figure 22 In contrast ground POF A is quite similar to Portland cement which crushed
particle is usually in irregular and angular shape as shown in Figure 21 amp 23 ( Chindaprasirt
et al 2007) The particle size of unground POFA is larger than OPC however the particle
size of ground POF A is smaller than OPe The typical particle size distributions of unground
and ground POF A and ope are shown in Figure 24 The median particle size of unground
POFA is about 543)lm -183)lm which is larger than ope which is in the range of I011m -20
1Jlll However the particle size of POFA is decreased to 72)lffi -lO1)lm after grinding
processes (Sata et al 2004 Chindaprasit et at 2008)
11
Figure 21 OPC (Chindaprasirt et ai 2007) Figure 22 Unground POFA (Jaturapitakkul
et ai 2007)
Figure 23 Ground POFA (Jaturapitakkul et ai 2007)
100 r==III~~iITinTI-1M-7I1
II
rriTiT11 Ground POFA JIl jill
90 ope mill J UOOUnd POFA t++tt+-l~I11H80 III IIT~+IIiI--+++IH
70 ~~t+~~UU~~~I IIIV-J~~U oo ~~U~~~Hm+M~~~I~~~
50 +-+tttlitl t-+-Ii+Itflt-+f+TMIlH-i++IHIt-I+tt+Ilt-i~ 1JlIIlt~ 40 +-r-lliM-=-+WII--l-+4R-++I r-H+fllf-++I I N+-i
~ ~~~I~~~~~J~Ir+~ 2o ~~~~~~~~~~~~~~~I I10 ~~~~~~A~~~_I_I~~~ o 1 w
001 01 10 00 1000 10000
Particle size (~m)
Figure 24 Particle size distribution of un ground and ground POFA and OPC (Sata et ai
2004)
12
fInned drum Lastly the semi molten material is cooled and pelletized by throwing them into
the air
233 SUtea Fume
Silica fume is a byproduct of the production of metallic silicon or ferrosilicon alloys which is
produced by electric arc furnaces (Nawy 2008) The two main components such as the types
of alloy fonned and the composition of quartz and coal are commonly used in the electric arc
furnaces which are significantly influence the chemical composition of silica fume The
majority ofpublished data indicates that the utilization of silica fume in concrete must contain
at least 75 ferro silicon
234 Rice Husk Ash
Rice husk ash is a by-product of the agricultural industry which is produced from burning a
mixture of rice husk and eucalyptus bark by fluidized bed combustion process in a biomass
power plant It consists of high amount of Si02 Silica content in the ash increases with higher
the burning temperature Many researches described that rice husk ash consists of high
reactivity and pozzolanic property after burning process at controlled temperature Chemical
composition of rice husk ash is greatly influenced by the temperature during burning
processes
24 The PbysieaJ Properties of POFA
According to AbdullaH et al (2006) the burning temperature condition is one of factors that
significantly influence the physical properties of POFA Several of physical properties of
9
Wlground and ground POF A used in various studies are shown in Table 21 These all
properties ofunground and ground POFA are briefly discussed below
Table 21 Physical properties of unground and ground POF A (Safiuddin et al 2011)
Properties OPC Unground POFA Ground PO FA
Color Grey Light greywhitish Dark grey
Specific gravity 314-328 178-197 222-278
Median particle size dso(urn) 10-20 543-183 72-101
Passing through 45-urn sieve 56-588 97-99
( mass)
Specific surface area Blaine 314-358 796 882-1244
(m2kg)
Strength activity index () 786-115
SOWldness Le Chatelier 045-1 05-26
expansion (mm)
141 Color
UngroWld POF A is usually in light grey color as results from the unburnt carbon content left
at relatively low burning temperature The content of unburnt carbon becomes very low when
the burning temperature is high Besides that unground POF A can also be whitish color in the
absence of unburnt carbon (Abdullah et al 2006) On the other hand ground POF A is dark
grey color
10
141 Specific Gravity
The specific gravity of unground POFA is normally varies in the range of 178-197 From
Table 21 above it can be seen that the specific gravity of unground POF A is about 40
lower than the specific gravity of ope (Tay 1990) However the specific gravity of POF A is
increased and it is about in the range of 222-278 after the grinding process (Sata et al 2004
Tangchirapat et al 2009) It is because the particle size of POF A is reduced and then the
porosity also decreased as results from grinding processes
143 Particle Shape and Size
The particle shape and size of unground POF A is different as compare to ground POF A It
was found that the particle shape and size are mostly large spherical and porous as shown in
Figure 22 In contrast ground POF A is quite similar to Portland cement which crushed
particle is usually in irregular and angular shape as shown in Figure 21 amp 23 ( Chindaprasirt
et al 2007) The particle size of unground POFA is larger than OPC however the particle
size of ground POF A is smaller than OPe The typical particle size distributions of unground
and ground POF A and ope are shown in Figure 24 The median particle size of unground
POFA is about 543)lm -183)lm which is larger than ope which is in the range of I011m -20
1Jlll However the particle size of POFA is decreased to 72)lffi -lO1)lm after grinding
processes (Sata et al 2004 Chindaprasit et at 2008)
11
Figure 21 OPC (Chindaprasirt et ai 2007) Figure 22 Unground POFA (Jaturapitakkul
et ai 2007)
Figure 23 Ground POFA (Jaturapitakkul et ai 2007)
100 r==III~~iITinTI-1M-7I1
II
rriTiT11 Ground POFA JIl jill
90 ope mill J UOOUnd POFA t++tt+-l~I11H80 III IIT~+IIiI--+++IH
70 ~~t+~~UU~~~I IIIV-J~~U oo ~~U~~~Hm+M~~~I~~~
50 +-+tttlitl t-+-Ii+Itflt-+f+TMIlH-i++IHIt-I+tt+Ilt-i~ 1JlIIlt~ 40 +-r-lliM-=-+WII--l-+4R-++I r-H+fllf-++I I N+-i
~ ~~~I~~~~~J~Ir+~ 2o ~~~~~~~~~~~~~~~I I10 ~~~~~~A~~~_I_I~~~ o 1 w
001 01 10 00 1000 10000
Particle size (~m)
Figure 24 Particle size distribution of un ground and ground POFA and OPC (Sata et ai
2004)
12
Wlground and ground POF A used in various studies are shown in Table 21 These all
properties ofunground and ground POFA are briefly discussed below
Table 21 Physical properties of unground and ground POF A (Safiuddin et al 2011)
Properties OPC Unground POFA Ground PO FA
Color Grey Light greywhitish Dark grey
Specific gravity 314-328 178-197 222-278
Median particle size dso(urn) 10-20 543-183 72-101
Passing through 45-urn sieve 56-588 97-99
( mass)
Specific surface area Blaine 314-358 796 882-1244
(m2kg)
Strength activity index () 786-115
SOWldness Le Chatelier 045-1 05-26
expansion (mm)
141 Color
UngroWld POF A is usually in light grey color as results from the unburnt carbon content left
at relatively low burning temperature The content of unburnt carbon becomes very low when
the burning temperature is high Besides that unground POF A can also be whitish color in the
absence of unburnt carbon (Abdullah et al 2006) On the other hand ground POF A is dark
grey color
10
141 Specific Gravity
The specific gravity of unground POFA is normally varies in the range of 178-197 From
Table 21 above it can be seen that the specific gravity of unground POF A is about 40
lower than the specific gravity of ope (Tay 1990) However the specific gravity of POF A is
increased and it is about in the range of 222-278 after the grinding process (Sata et al 2004
Tangchirapat et al 2009) It is because the particle size of POF A is reduced and then the
porosity also decreased as results from grinding processes
143 Particle Shape and Size
The particle shape and size of unground POF A is different as compare to ground POF A It
was found that the particle shape and size are mostly large spherical and porous as shown in
Figure 22 In contrast ground POF A is quite similar to Portland cement which crushed
particle is usually in irregular and angular shape as shown in Figure 21 amp 23 ( Chindaprasirt
et al 2007) The particle size of unground POFA is larger than OPC however the particle
size of ground POF A is smaller than OPe The typical particle size distributions of unground
and ground POF A and ope are shown in Figure 24 The median particle size of unground
POFA is about 543)lm -183)lm which is larger than ope which is in the range of I011m -20
1Jlll However the particle size of POFA is decreased to 72)lffi -lO1)lm after grinding
processes (Sata et al 2004 Chindaprasit et at 2008)
11
Figure 21 OPC (Chindaprasirt et ai 2007) Figure 22 Unground POFA (Jaturapitakkul
et ai 2007)
Figure 23 Ground POFA (Jaturapitakkul et ai 2007)
100 r==III~~iITinTI-1M-7I1
II
rriTiT11 Ground POFA JIl jill
90 ope mill J UOOUnd POFA t++tt+-l~I11H80 III IIT~+IIiI--+++IH
70 ~~t+~~UU~~~I IIIV-J~~U oo ~~U~~~Hm+M~~~I~~~
50 +-+tttlitl t-+-Ii+Itflt-+f+TMIlH-i++IHIt-I+tt+Ilt-i~ 1JlIIlt~ 40 +-r-lliM-=-+WII--l-+4R-++I r-H+fllf-++I I N+-i
~ ~~~I~~~~~J~Ir+~ 2o ~~~~~~~~~~~~~~~I I10 ~~~~~~A~~~_I_I~~~ o 1 w
001 01 10 00 1000 10000
Particle size (~m)
Figure 24 Particle size distribution of un ground and ground POFA and OPC (Sata et ai
2004)
12
141 Specific Gravity
The specific gravity of unground POFA is normally varies in the range of 178-197 From
Table 21 above it can be seen that the specific gravity of unground POF A is about 40
lower than the specific gravity of ope (Tay 1990) However the specific gravity of POF A is
increased and it is about in the range of 222-278 after the grinding process (Sata et al 2004
Tangchirapat et al 2009) It is because the particle size of POF A is reduced and then the
porosity also decreased as results from grinding processes
143 Particle Shape and Size
The particle shape and size of unground POF A is different as compare to ground POF A It
was found that the particle shape and size are mostly large spherical and porous as shown in
Figure 22 In contrast ground POF A is quite similar to Portland cement which crushed
particle is usually in irregular and angular shape as shown in Figure 21 amp 23 ( Chindaprasirt
et al 2007) The particle size of unground POFA is larger than OPC however the particle
size of ground POF A is smaller than OPe The typical particle size distributions of unground
and ground POF A and ope are shown in Figure 24 The median particle size of unground
POFA is about 543)lm -183)lm which is larger than ope which is in the range of I011m -20
1Jlll However the particle size of POFA is decreased to 72)lffi -lO1)lm after grinding
processes (Sata et al 2004 Chindaprasit et at 2008)
11
Figure 21 OPC (Chindaprasirt et ai 2007) Figure 22 Unground POFA (Jaturapitakkul
et ai 2007)
Figure 23 Ground POFA (Jaturapitakkul et ai 2007)
100 r==III~~iITinTI-1M-7I1
II
rriTiT11 Ground POFA JIl jill
90 ope mill J UOOUnd POFA t++tt+-l~I11H80 III IIT~+IIiI--+++IH
70 ~~t+~~UU~~~I IIIV-J~~U oo ~~U~~~Hm+M~~~I~~~
50 +-+tttlitl t-+-Ii+Itflt-+f+TMIlH-i++IHIt-I+tt+Ilt-i~ 1JlIIlt~ 40 +-r-lliM-=-+WII--l-+4R-++I r-H+fllf-++I I N+-i
~ ~~~I~~~~~J~Ir+~ 2o ~~~~~~~~~~~~~~~I I10 ~~~~~~A~~~_I_I~~~ o 1 w
001 01 10 00 1000 10000
Particle size (~m)
Figure 24 Particle size distribution of un ground and ground POFA and OPC (Sata et ai
2004)
12
Figure 21 OPC (Chindaprasirt et ai 2007) Figure 22 Unground POFA (Jaturapitakkul
et ai 2007)
Figure 23 Ground POFA (Jaturapitakkul et ai 2007)
100 r==III~~iITinTI-1M-7I1
II
rriTiT11 Ground POFA JIl jill
90 ope mill J UOOUnd POFA t++tt+-l~I11H80 III IIT~+IIiI--+++IH
70 ~~t+~~UU~~~I IIIV-J~~U oo ~~U~~~Hm+M~~~I~~~
50 +-+tttlitl t-+-Ii+Itflt-+f+TMIlH-i++IHIt-I+tt+Ilt-i~ 1JlIIlt~ 40 +-r-lliM-=-+WII--l-+4R-++I r-H+fllf-++I I N+-i
~ ~~~I~~~~~J~Ir+~ 2o ~~~~~~~~~~~~~~~I I10 ~~~~~~A~~~_I_I~~~ o 1 w
001 01 10 00 1000 10000
Particle size (~m)
Figure 24 Particle size distribution of un ground and ground POFA and OPC (Sata et ai
2004)
12