Experimental study on strength properties of concrete replacing cement by marble dust and sand by iron ore tailings

The present experimental study is carried out to find the behaviour of iron ore tailings (IOT) and marble dust by partially replacing fine aggregate (natural sand) at 10%,20%,30%,40% and ordinary Portland cement (OPC) at 5% 10%,15%,20% respectively for M40 grade concrete as per IS 10262-2009. The sample of IOT material for the present project is brought from Bellary district Karnataka. The test was carried on fresh and hardened concrete. It is found that as the percentage of IOT increase workability reduces. So admixture superplasticizer "CONPLAST-SP340" was used to maintain workability. The optimum replacement was found at 10% IOT and 5% marble dust based on strength properties.