A Study on Mechanical Properties of jute

Fiber Reinforced Concrete Mr.S.Sabarinathan. Assistant Professor,

D.Devaraj, M.Jeyamani, D.Priyadharshini .IV th year Civil Engineering,

Department of Civil Engineering,

Shree Venkateshwara Hi Tech Engineering College, Othakuthirai, Gobi – 638 455.

Sabari.sudhakar@gmail.com

manijeya143@gmail.com

Abstract- World wide a great deal of research is

currently being conducted concerning the use of

fiber reinforced plastic wraps laminates and sheets

in the repair and strengthening of reinforced

concrete members. For that natural and low cost

materials are to be used in construction. For that

using fibers to improve the characteristics of

construction materials Natural fibers are classified

into two different form: inorganic form and organic

form. India is one of the largest producer of jute

fiber. In our project jute fiber was added in the

percentage of 0.5%, 1%, 1.5%, and 2%. Our project

deals with the test on concrete strength. Strength test

like compressive strength, split tensile strength.

INRODUCTION

1.1 General

Concrete technology has developed at a

fast pace indeed during the last two decades,

and material performance has been significantly

improved It is difficult to maintain strength of

concrete and increase its durability, so addition

of natural fibres is economical way to increase

strength of concrete. Natural fibres offer various

advantages such as low density, low cost,

biodegradability, acceptable specific properties,

better thermal and insulating properties, and

low energy consumption during processing.

Our project deals with fibre reinforced concrete

with jute as a fibre reinforcing material in

concrete. Initially the attention of researchers

was focused on enhancing compressive

strength. High strength concrete with a

compressive strength over 100Mpa can now be

readily designed and manufactured. However

the brittleness of concrete increases with an

increase in its strength; the higher the concrete

strength, the lower its ductility. The addition of

fibers into the concrete matrix counteracts its

brittleness, producing materials with increased

tensile performance, and improved ductility.

Fiber-reinforced concrete (FRC) is concrete

contains fibrous material which increases its

structural integrity .It contains short discrete

fibers that are uniformly distributed and

randomly oriented .Fiber include steel fibers

,glass fibers, synthetic fibers and natural fibers.

Within these different fibers that character of

fibers-reinforced concrete changes with varying

concretes, fiber materials, geometries,

distribution, orientation and densities.

A. Objective of the project

To determine the properties of fresh

concrete with and without jute fibre.

To determine the mechanical properties of

concrete with jute fibre.

To determine the optimum percentage of

jute fibre.

To compare the results with and without

jute fibre.

B. scope of the study

Concrete is widely used in structural

engineering with its high compressive strength,

low cost and abundant raw material. But

common concrete has two major deficiencies, a

low tensile strength and a low strain at fracture.

The tensile strength of concrete is very low

because plain concrete normally contains

numerous micro cracks. It is the rapid

propagation of these micro cracks under applied

stress that is responsible for the low tensile

strength of the material. To overcome these

deficiencies, additional materials are added to

improve the performance of concrete. Current

research has developed a new concept to

increase the concrete ductility and its energy

absorption capacity, as well as to improve

overall durability. This new generation

technology utilizes fibers, which if randomly

dispersed throughout the concrete matrix,

provides better distribution of both internal and

external stresses by using a three dimensional

reinforcing network. The primary role of the

fibers in hardened concrete is to modify the

cracking mechanism. By modifying the

cracking mechanism, the macro-cracking

becomes micro-cracking. The cracks are

smaller in width, thus reducing the permeability

of concrete and the ultimate cracking strain of

the concrete is enhanced.

MATERIALS

Cement

53 grade Ordinary Portland cement is used for

the study Program. The properties of this cement

have been tested and given below:

Specific gravity of Cement = 3.15

Initial Setting Time =30 minutes

Fine Aggregate

Concrete as it was locally available in sand quarry.

The properties of this fine aggregate have been

tested and given below:

Specific gravity G = 2.75

Water absorption = 2.5%

Coarse Aggregate

Aggregate must be equal to or better than the

hardened cement to withstand the designed loads

and the effects of weathering. The properties of this

coarse aggregate have been tested and given below:

Specific gravity G = 2.83

Water absorption = 1.5%

Water

Potable water available in laboratory with pH

value of 7.0 ± 1 and confirming to the requirement

of IS: 456-2000 was used for mixing concrete and

curing the specimens as well

Jute Fiber

Jute is a long, soft, shiny vegetable fiber that can

be spun into coarse, strong threads. It is produced by

primarily from plants in the genus corchorus, which

was once classified with the family tiliaceae, and

more recently with malvaceae. The word jute is

probably coined from the word jhuta or jota, an

Oriya word

MIX PROPORTION

In this project the mix design ratio used as

1:1.57:2.69 M30 grade concrete.

Table 1 mix proportion

S.no Cement

kg

FA

kg

CA

kg

Water

%

Fiber

kg

1 111.05 218.05 467.23 0.45 1.3

FRESH CONCRETE TEST

1. Slump cone test

% of jute fiber Slump value in cm

0 9

0.5 7

1 4.5

1.5 4.3

2 4.2

2. Compaction Factor Test

% of jute fiber Compaction factor

value

0 0.755

0.5 0.680

1 0.693

1.5 0.662

2 0.654

HARDENED CONCRETE TEST

1. Compressive Strength Test

The compressive strength test: cubes were

tested for compressive strength using CTM.

% of fiber

added

Compressive strength (N/mm2 )

7 days 28 days

0 33.33 36.6

0.5 30.77 35.55

1 26.88 25.44

1.5 22.7 29.11

2 16.66 31.77

Graph 1: compressive strength test

Figure 1: testing of specimen

0

5

10

15

20

25

30

35

40

45

0 0 . 5 1 1 . 5 2

ST

RE

NG

TH

IN

N/M

M2

% OF FIBER

2. Split Tensile Strength

Split tensile strength: cylinders were tested in the

CTM

% of fiber

added

Split tensile strength N/mm2

7 days 28 days

0 2.65 2.65

0.5 2.44 2.90

1 2.33 2.26

1.5 2.12 2.44

2 2.08 2.12

.

Graph 2: tensile strength test

Figure 2: tensile strength test

Future development

To find the durability test on concrete with

and without jute fiber.

Durability tests are acid attack test, water

absorption test and sorptivity test.

Conclusion:

The compressive strength and split tensile strength

of jute fiber reinforced concrete test results shown

that the strength of jute fiber reinforced concrete is

increased gradually when we increase the

percentage of fiber. It has been clearly noted that

adding fiber gives good strength with ratio 0.45.

References:

T. Sai vijaya Krishna, B. Manoj yadav: “a

comparative study of jute fibre reinforced

concrete with plain cement concrete”.

a.roshen, n.mahale : “use and development

of jute fibre in reinforced cement concrete

grade m40”.

dr.n.r.krishna murthy : “study on

addition of the natural fibres into

concrete”

k. mohan : “an experimental study on

mechanical properties of jute fibre

reinforced concrete beams”.

0

0.5

1

1.5

2

2.5

3

3.5

4

0 0.5 1 1.5 2

spli

t te

nsi

le i

n n

/mm

2

% of fiber

7 days

28 days