Optimization of fully replacement of natural sand by m-sand In high performance concrete with nanosilica

Abstract— In recent days the demand for river sand is increasing due to its lesser availability. Hence the practice of replacing river sand with M-Sand is taking a tremendous growth. It is also inferred from the literature that replacement of normal sand with M-Sand produces no appreciable increase in compressive strength due to the variation in the pore size of concrete at micro level. This paper presents the optimization of fully replacement of manufactured sand by natural sand with nano silica in high performance concrete. The ordinary Portland cement is partially replaced with nanosilica by 0.75% and natural sand is fully replaced with manufactured sand. The studies reveal that the increase in percentage of partial replacement of nano silica increased the compressive, tensile and flexural strength of concrete..