Influence of Fly Ash and Silpozz on the Concrete Containing Crusher Dust as Sand Replacement Material

This paper is aimed at finding out any other alternate materials to be used in concrete without compromising its desired quality and durability. The mix design is targeted for M30 grade concrete with w/b ratio 0.43. The investigation comprises of 12 numbers of concrete mixes. First two mixes were made by replacing 0 and 50% of natural fine aggregate (NFA) with crusher dust (CD). Then at each replacement level of NFA, cement is replaced partially with both fly ash (FA) and silpozz. The studied parameters include the workability, compressive, split tensile and flexural strength of concrete samples after 7, 14, and 28 days of curing period. Workability decreases with increase in CD and silpozz content and increases with FA. The hardened concrete test results indicate that CD-based concrete increases the compressive, split tensile and flexural strength. Use of FA and silpozz increases the strength and maximum strength is achieved at 20% replacement of cement with silpozz.