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In the present study an investigation is made on properties of concrete by partial replacement of cement with Ground Granulated Blast furnace Slag (GGBS) . GGBS is the by-product of iron and steel industry which is produced in large quantities as a solid waste. It is highly cementitious. The replacement percentages of cement with GGBS are 20%, 40% and 60% by weight . And it is mentioned that replacement of 40%-50% with GGBS gives the best result in compressive strength after 28 days. But it can further be optimized with the very sharp and approximate % of GGBS. GGBS is replaced by 40%,42%,44%,46%,48%,50% by weight of cement and then characteristics compressive strength after 28 days is analyzed and then it is compared with conventional normal concrete strength. KeywordsGGBS, Concrete, Compressive strength.

The Effect of Ground Granulated Blast Furnace Slag as an Alternative Cement Replacement Material in Concrete after 28 Days Strength – A Review