Strength Evaluation of High Strength Concrete by Using Fly Ash and Silica Fume as A Partial Replacement of Cement

Abstract

Abstract: Presently large amounts of fly ash are generated in thermal industries with an important impact on environment as well as humans. In recent years, many researchers have established that the use of supplementary cementitious materials like fly ash (FA), GGBS, blast furnace slag, silica fume, metakaolin, and rice husk ash, hypo sludge etc. can, not only improve the various properties of concrete, but also can contribute to economy in construction costs. This research work describes the feasibility of using Fly ash and Silica Fume as partial replacement of cement. The cement has been replaced by fly ash accordingly in the range of 0%, 10%, 20%, 30%, 40%, 50%, and 60% by weight of cement and 10% of silica fume in common for M30 grade of Concrete. Concrete mixtures produced, tested and compared in terms of compressive strength and split tensile strength with the conventional concrete for 7, and 28 days. It is found that, 30% of fly ash and 10% of silica fume can be replaced and good strength obtained is comparable to the conventional concrete mix.