The construction industry has a wide range of work globally. In today’s world, the construction rate is progressing very faster which results in the faster consumption of naturally occurring construction materials. The consumption rate of natural sand is increased very rapidly from last few years. In the recent era, global warming affects the environment very badly whose adverse effects can be seen as dry rivers and streams. We get natural sand from these rivers and streams but extraction in a large amount affects the environment. In this dissertation, the work is executed to study the optimum percentage replacement of steel slag with natural sand by which the excessive usage of fine aggregate can be minimized.