EFFECT OF DIFFERENT LIGHTWEIGHT AGGREGATES FOUND IN PAKISTAN ON PROPERTIES OF LIGHT WEIGHT CONCRETE

TITLE

RESEARCH SUPERVISOR: PROF. DR. LIAQAT ALI QURESHI PROPOSED BY: ENGR. MUHAMMAD SHAHID MEHMOOD 11-PT-MSC-STR-06

Introduction

Lightweight concrete has been successfully used now a

days and it has gained its popularity due to its lower

density and superior thermal insulation properties. As

Compared with normal weight concrete, Lightweight

concrete significantly reduce the dead load of structural

elements, which makes it suitable in multistory buildings.

Introduction

• In practice, the density of normal weight concrete lies

within the range of 2200 to 2600 kg/m3 (140 to 160 lb/ft3).

Consequently, the self weight of concrete element is high

and contributes a large proportion of the load on structure.

• Lightweight concrete has a density between 1350 to 1900

kg/m3 (85 to120l b/ft3). Thus using lower density concrete

gives benefits in terms of small cross section of beams and

a corresponding reduction in size of load bearing elements.

Problem Statement• In concrete construction, self weight of concrete represents

major proportion of load on structure, thus there are clearly

considerable advantages in reducing weight i.e. density of

concrete for high rise buildings, long span bridges and for

various types of structures.

• Thus there is always realizing a need to study the various

properties of lightweight aggregate concrete and developing

co-relation for these properties. So, lightweight concrete can

be used for structural applications with strength equivalent to

normal weight concrete.

Problem Statement

• This research aims to study properties of light weight concrete using lightweight aggregates found in Pakistan.

Objectives Influence of different types of Lightweight aggregates on mechanical

performance of Lightweight Aggregates Concrete (LWAC) will be

studied.

Quality of different light weight aggregates derived from different

sources in Pakistan will be determined.

Suitability of different types of light weight aggregates found in Pakistan

with respect to different concrete properties will be determined.

Cost comparison will be carried out for different types of light weight

aggregate concretes cast in Pakistan.

Methodology

1) Literature survey will be continued and expanded to the latest

research made on the topic in different parts of the world.

2) Sources for different types of light weight aggregates like expanded

shale, expanded clay, Pumice etc will be searched out in Pakistan

and availability of materials will be made sure.

3) Concrete mix. design will be carried out for normal strength

concrete and normal weight aggregates.

4) Physical properties tests will be carried on cement i.e., compressive

strength, consistency, setting time, expansion, fineness etc.

Methodology

5) Sieve analysis will be carried out for sand, normal weight coarse

aggregate and all types of light weight aggregates as per British

Standard. Grading curves will be plotted and fineness modulus will

be found.

6) Aggregate tests like, Loss Angeles Abrasion Test, Bulk Density,

Shape index, Acid reactivity etc will be carried out for both normal

weight and all types of light weight coarse aggregates.

7) The following tests will be carried out on normal weight concrete

and all types of light weight concretes.

Methodology

8) If some tests are failed for some types of lightweight

aggregate concrete, Mix. design will be revised after selecting

suitable admixture or changing water cement ratio.

9) Casting will be carried out again for that type of concrete

only by using revised Mix. design. Tests will be revised and

results confirmed.

10) Graphs will be drawn and results will be analyzed.

11) At the end, the whole research would be compiled into a

report form.

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