This paper exhibits the evolution of an economical and ecofriendly concrete by usage of waste foundry sand which is discarded from foundry industries at a very large scale annually. In this paper experimental analysis had been done to determine the feasibility of waste foundry sand as replacement of fine aggregates. In the present research, an M25 grade pumpable concrete is prepared with various percentages (10%, 20%, 30%, 40%, 50% and 60%) of replacement of fine aggregates with waste foundry sand and its compressive strength was tested. Also, the split tensile strength of concrete was analyzed for different percentages (30%, 40% and 50%) at which we got satisfactory results for compressive strength. The properties are then compared with that of conventional concrete and also the cost of same was analyzed. Several properties of fresh concrete like slump and compaction factor of the concrete were also investigated. The paper concludes that the compressive strength increases on increasing the percentage of replacement of fine aggregates with waste foundry sand but only up to a certain percentage of replacement. Post 40% replacement of fine aggregates with waste foundry sand, the compressive strength decreases. Also, the paper deduced that split tensile strength decreases on increasing the percentage of waste foundry sand in concrete.
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