Experimental Study on Partial Replacement of the Cement by RHA & GGBS and Natural Sand by Quarry Sand in Concrete

In civil engineering industry Concrete is an extraordinary and key structural material in the human history. Presently Portland cement and supplementary cementitious materials are cheapest binders which maintain the performance of concrete. However, out of these binders, production of Portland cement is very energy exhaustive along with CO2 production. About 1 tonne of CO2 is produced in manufacturing of each tonne of Portland cement (PC). Concrete is a heterogeneous mix of cement, aggregates and water. The samples were tested at the age of 7 days, 28 days. The test on hardened concrete are destructive test while the destructive test includes compressive strength test as per IS: 516-1959, split tensile strength test as per IS: 5816-1999, flexure strength test as per IS: 516-1959.The research is carried out in total three phase. In first phase, mix of M 30 grades concrete with replacement of 0%, 20%, 40%, 60%, 80% and 100% of quarry sand with natural sand is carried out. From this first phase to determine the optimum percentage of quarry sand this gives maximum compressive strength. It is observed that maximum strength is achieved when natural sand is partially replaced with 60% quarry sand. In second phase, the cement is partially replaced with GGBS by 10%, 20% and 30%. In third phase, combination of GGBS and RHA is partially replaced with cement. It is observed that the composition of 7.5% RHA + 22.5% GGBS+ 60% of quarry sand gives good strength results.