STUDY ON THE ENHANCEMENT OF THE PROPERTIES OF CONCRETE BY OPTIMIZING THE PROPOTIONS OF HYBRID MINERAL ADMIXTURES

Since advent of civilization various types of cementitous materials have been used for constructiuon practices. The arrival of Ordinary Portland Cement changed the construction activities completely. However, because of several drawbacks associated with properties of cement and manufactured building materials using OPC as well as the cost factor attempts one mode to utilize other materials for economical constructions and improved mortar and concrete characteristics. Now attempts were made to utilize these waste materials or industrial byproducts in construction activities to solve the environmental pollution problems, and safer and economical construction. In this paper Fly Ash and Silica Fume has been used as a hybrid mineral admixture as a replacement material for cement..The physical and chemical properties of Fly Ash and Silica Fume has been studied and these materials are replaced for cement by the following proportions 25%F.A-5%S.F, 20%F.A-10%S.F,15%F.A-15%S.F and 10%F.A-20%S.F. Specimens have been casted to determine the mechanical properties such as compressive strength, split tensile strength and flexural strength to find out the optimum proportions of the admixture and durability properties like acid attack, sulphate attack and chloride attack to find out the resistance offered by the mineral admixtures in concrete which can undergo deterioration due to various salts