Nowadays, researchers are working on sustainable development and as far as concrete is concerned, it needs to be green. The cement production pollutes the ecosystem and the aggregates especially the second most consumed natural resource, the sand on extraction causes massive impact on the earth. Therefore attempts have been made in this research to use industrial wastes as partial replacement materials of cement and sand to determine the optimum replacement levels of cement with fly ash and sand with GGBS. On the other hand, roller compacted concrete production faces some performance issues due to segregation and honeycombing caused by its stiff nature. Hence, it is recommended to use fines to eliminate such problems. The fly ash percentage dosages are 10%, 20% and 30% while 20%, 30% and 40% for GGBS. Initially, trials by slump cone method are done to keep slump as zero. The cubical specimens are cast by vibrating table and surcharge weight and are tested for density and water absorption at 28 days. The result indicates that the optimum replacement level of fly ash and GGBS have come out to be 30% and 40% respectively for both density and water absorption.