Effect of Fines Modulus of Crushed Sand on the Mechanical Properties of Concrete.
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Date
2021-07
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Addis Ababa University
Abstract
This experimental study is to investigate the optimum fineness modulus range of crushed sand to
be used in concrete mixes. For compressive strength determination of the hardened concrete, 45
concrete cubes and for flexural strength determination, 30 concrete simple beam specimen were
prepared for testing. Five different fineness moduli and grading were tested 2.2, 2.5, 2.8, 3.0 and
3.2. All concrete cubes were left in curing until testing at the age of 7, 28 and 56 days
respectively whereas the simple beam specimen were left in curing for the age of 7 and 28 days.
Samples were loaded to failure and the average compressive and flexural strength was used for
comparison purposes. To measure the workability of fresh concrete mixes, slump test had been
used directly after mixing. Results confirmed that the optimum fineness modulus range for the
crushed sand to be used as fine aggregate in the concrete mix to get maximum compressive and
flexural strength is from 2.6 to 3.0. The slump test revealed an increment in the workability of
fresh concrete with higher fineness modulus of crushed sand used in the concrete mix. The slump
measure for the optimum fineness modulus is in the range of the recommended slump value
which makes a workable mix. All finely crushed sand used in this research study checked to
match the ASTM grading requirements for fine aggregate.
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Keywords
Concrete, Aggregate, Crushed Rock Sand, Fineness Modulus, Compressive Strength, Flexural Strength