Ground Granulated Blast furnace Slag (GGBS) is a byproduct from the blast furnaces used to produce iron. The use of GGBS serves as a replacement to already depleting conventional building materials and also as being a byproduct it serves as an Eco Friendly way of applying the product without dumping it along the dry land. The present technical report focuses on investigating the characteristics of concrete with partial replacement of cement with Ground Granulated Blast furnace Slag (GGBS) by replacing cement. The replacement level of GGBS in concrete is 0%, 5%, 20%, 35%, 50% by the total weight of cement. A total of 150 specimens has been cast and tested according to the IS Code. All specimens were moist cured for 7, 14 and 28 days for compressive strength, split tensile strength and flexural strength testing. The test results proved that the compressive strength, split tensile strength and flexural strength of concrete mixtures increases as the amount of GGBS increase. A numerical equation has also been developed to predict the strength of concrete containing various percentages of GGBS at different ages for M25 grade of concrete. After an optimal point, about 20 % of GGBS does not improve the compressive strength and split tensile strength of the concrete.

Keywords : GGBS, Mechanical Properties, Numerical Equation, Optimum level.