The greatest challenge before the construction industry is to serve the two pressing needs of human society namely the protection of the environment and meeting the infrastructure requirement of our growing pollution and consequential needs of industrialization and urbanization. It is looking for the ways and means to develop building products, which will increase the life span and quality. Therefore, it should be obvious that certain scale cement replacement with industrial by products is highly advantageous from the stand point of cost, economy, energy efficiency, durability and overall ecological and environmental benefits. Experimental investigation on strength aspects like compressive, flexural and split tensile strength of self-compacting concrete (SCC) containing different levels of fly ash and workability tests for different mineral admixtures (slump, L-box, V-funnel and〖 T〗_50) are carried out. The methodology adopted is that mineral fly ash is replaced by 10%, 20%, 30%, 40%, 50%, 70% for Portland slag cement and performance is measured and compared.