A Study on the Mechanical Properties of Light Weight Concrete by Replacing Course Aggregate with (Pumice) and Cement with (Fly Ash)

Document Type : Primary Research paper

Authors

1 Assistant Professor Department of Civil Engineering Nehru Institute of Technology

2 Assistant Professor Department of Civil Engineerin1,2,3Assistant Professor Department of Civil Engineering Nehru Institute of Technologyg Nehru Institute of Technology

Abstract

Light weight concrete has become more popular in recent years owing to the
tremendous advantages it offers over the conventional concrete. Even Light concrete but at
the same time strong enough to be used for the structural purpose. Lightweight concrete
has been successfully used since the ancient Roman times and it has gained its popularity
due to its lower density and superior thermal insulation properties. Compared with Normal
weight concrete, Lightweight concrete can significantly reduce the dead load of structural
elements, which makes it especially attractive in multi-storey buildings. The most important
characteristic of light weight concrete beside its light weight is its low thermal conductivity.
This property improves with decreasing density. The adaptation of certain class of light
weight concretes gives an outlet for industrial wastes and dismantled wastes which would
otherwise create problems for disposal.
The conventional mix has been designed for M25 grade concrete. Coarse aggregate
replaced with Pumice aggregate in volume percentages of 25% and 33.33% further Cement
replaced with the Fly ash in weight percentages of 15%, 20%, 25%, 30% for study in the
present investigation. The properties like Compressive strength, Split tensile strength,
Flexural strength and Youngs’ modulus of above combinations were studied and compared
with conventional design mix concrete.
It is observed that there is retardation in Compressive strength, Split tensile strength,
Flexural strength and Young’s’ modulus for the light weight aggregate replaced concrete
when compared to the concrete made with normal aggregate. For these light weight
aggregate concrete mixes when ‘cement’ was replaced by ‘fly ash’ it is noticed that there is
a marginal improvement in the properties studied. For 25% replaced light weight
aggregate when cement was replaced by 15%, 20%,25% and 30%fly ash, the maximum
gain in compressive strength of 18.71% at 28 days is observed for 20% replacement of fly
ash. Similarly the gain in split tensile strength, flexural strength and Youngs’ modulus of
16.66%, 29.51% and 10.15% is observed at 20% replacement of fly ash respectively. For
33.33% replaced light weight aggregate when cement was replaced by 15%,20%,25% and
30% fly ash, the maximum gain in compressive strength of 26.3 % is observed for 20%
replacement of fly ash. Similarly the gain in split tensile strength, flexural tensile strength
and Youngs’ modulus of 19.23%,26% and 3.33% is observed at 20% replacement of fly ash
respectively Hence we can infer that 20% replacement of cement by fly ash is optimum
proportion among the proportions tested for the properties studied in the present
investigation.

Keywords

Int. J. of Aquatic Science
Volume 12, Issue 1
International virtual conference on Newer Trends and Innovation in Nanotechnology Materials Science . Science and Technology
March 2021
Pages 534-543

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