Quantify the Physical Properties of Concrete by Partial Replacement of River Sand by M- Sand Using Fly Ash as Mineral Admixture

Abstract: Sand and cement, which go into making concrete, is in great demand because it is a crucial building material. Due to this demand, environmental degradation is rising during the production of cement and river basins are running out of sand. Concrete is being updated with suitable substitutes without sacrificing its durability and strength. Fly ash and M sand are used in this study as alternatives to cement and fine aggregates, respectively. Fly ash is by product of combustion process; hence utilizing this product in concrete can be advantageous to both the environment and cost considerations. Whereas M sand is obtained by crushing aggregates into desirable sizes which can benefit workability of concrete .The percentage of these alternatives for which partial replacement results in higher test values is indicated in this study. Super plasticizer was used in testing on newly laid concrete. M 45 grade concrete mix design as per IS 10262:2019 is calculated. Testing was done on M45 grade fresh concrete for workability: slump cone test, compaction factor test, vee bee consist-meter test, as well as hardened concrete for compression strength, tensile strength, and flexural strength. The tests were conducted for variable percentages of fly ash and M sand by weight of cement and natural sand replacement. In this study natural sand is replaced with M sand in 0, 10, 20, 30, 40 & 50% for every 0%, 10% & 15% replacement of fly ash with cement. Satisfying results were found for 10% fly ash and 40% M sand mix for both workability tests and strength tests conducted in the specimen.