Study of Properties of High Strength Concrete Prepared By Partial Replacement of Cement with GGBS

Concrete is a composite construction material composed mainly of cement, fine aggregate, coarse aggregate and water. Concrete is designated as “high strength concrete” on the basis of its compressive strength measured at a given age. Concrete mix that show 40MPa or more compressive strength at 28-days are designated as high-strength concrete. Now days, 60-100 MPa concrete mixes are commercially developed. Aggregate occupy 70-75% of the total volume of concrete. Unfortunately, production of cement involves emission of large amounts of carbon-dioxide gas a major contributor for green house effect and global warming. Hence it is inevitable to search either for a substitute to cement or partially replace it by some other material. Mineral admixtures such as blast furnace slag powder can be used as partial replacement to cement by 10 to 50%. In this study first the properties of a normal HSC M60 mix was evaluated. Then mixes with 30%, 40%, and 50% replacement of cement with GGBS was prepared and optimum percentage was determined by studying the fresh and Hardened state properties and comparing it with control mix. Optimum percentage was selected as 40%. Fresh properties of the HSC will be tested for slump and Compaction factor test. Hardened properties of HSC will be studied for compressive strength, flexural strength and splitting tensile strength. By studying the compressive strength of mix with partial replacement of GGBS gave high strength than Control mix. When comparing the Split tensile strength, and flexural strength also HSC with partial replacement of GGBS gave satisfactory results.