Effect Of Fines Modulus Of Crushed Sand On The Mechanical Properties Of Concrete.

This experimental study is to investigate the optimum fineness modulus range of crushed sand tornbe used in concrete mixes. For compressive strength determination of the hardened concrete, 45rnconcrete cubes and for flexural strength determination, 30 concrete simple beam specimen werernprepared for testing. Five different fineness moduli and grading were tested 2.2, 2.5, 2.8, 3.0 andrn3.2. All concrete cubes were left in curing until testing at the age of 7, 28 and 56 daysrnrespectively whereas the simple beam specimen were left in curing for the age of 7 and 28 days.rnSamples were loaded to failure and the average compressive and flexural strength was used forrncomparison purposes. To measure the workability of fresh concrete mixes, slump test had beenrnused directly after mixing. Results confirmed that the optimum fineness modulus range for therncrushed sand to be used as fine aggregate in the concrete mix to get maximum compressive andrnflexural strength is from 2.6 to 3.0. The slump test revealed an increment in the workability ofrnfresh concrete with higher fineness modulus of crushed sand used in the concrete mix. The slumprnmeasure for the optimum fineness modulus is in the range of the recommended slump valuernwhich makes a workable mix. All finely crushed sand used in this research study checked tornmatch the ASTM grading requirements for fine aggregate.

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