Mathematical models for performance of concrete by replacing natural sand with stone dust

Sushil Kumar Singh Gaur, Sunil Kumar

Abstract


This study is carried out to evaluate the performance of concrete by replacing natural sand with granite stone dust. Compressive strength of concrete was observed by replacing natural sand with granite stone dust in ratio of 20%, 40% and 100% for a constant W/C of   0.45 and a slump of 100 ±20 mm to have pump able properties in concrete. A total of four concrete mixes MS-1, MS-2, MS-3 (with 20%, 40% and 100% replacement of natural sand) including a reference mix M-1(having 100% natural fine aggregate) with a design mix ratio of 1:1.76:2.28 as per IS 10262,   were casted. Mechanical properties of NA and stone dust were studied and different concrete mixes were tested for compressive strength after 7, 28, 90 and 120 days of water curing. Samples of all four mixes were also subjected to different temperature ranges of 2000C, 400˚C, 600˚C and 800˚C for duration of one hour after a curing period of 120 days. A mathematical model was developed to observe the compressive strength for different replacement ratios of sand with stone dust at different age and at different temperature exposures and it was observed that age of concrete has a positive correlation with strength whereas % replacement of sand and temperature has a negative effect on strength.


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