Effect of calcined clay on fresh and hardened properties of self-compacting concrete (SCC)

The utilization of supplementary cementitious materials (SCM) such as calcined clays in self-compacting concrete (SCC) could reduce thequantity of cement as well as providing crucial environmental benefits. This study aims at investigating the influence of calcined clay on the freshand hardened properties of SCC. Ordinary Portland cement was partially replaced with calcined clay at replacement dosages of 10%, 20% and 30%by weight. Fresh SCC properties conducted were slump flow, L-box and J-flow tests. Compressive strength, split tensile strength and flexural strengthtests were evaluated after 7 and 28 days curing. A relationship between compressive strength and split tensile strength was drawn. Workabilitywas found to decrease with increasing calcined clay content. At 28 days, SCC containing 10% calcined clay outperformed the reference concrete butbegan to decline when replacement was increased to 20% and 30%. Optimum replacement was found to be 20%