Experimental Study of Recycled Aggregate Concrete Produced from Recycled Fine Aggregate

Abstract

AbstractCurrently, in developing countries, the construction industry which uses a huge amount of concrete is booming at a faster growth rate due to an ever-increasing population and urbanization. To satisfy the high concrete demand natural resources like natural sand are depleting and river beds are eroded due to mining of natural sand. On the other hand, construction and demolition wastes disturb the environment due to different construction and demolition activities. Thus, in this study RCFA from concrete cubes at a laboratory was used to check the suitability of RCFA for concrete production as a partial replacement of natural sand. A mix of C - 25 concrete was prepared with 0%, 10%, 20%, 30%, 40%, 50%, and 100% replacement of natural sand by RCFA with and without admixture to check the compressive strength and workability of concrete. The workability of mixes without admixture increases as the replacement ratio of RCFA increases and vice versa for mixes with an admixture. The compressive strength of concrete decreases as the replacement ratio of RCFA increases. Even if there is a decrease in compressive strength as replacement ratio of RCFA increases, it is possible to replace NS up to 20% without an admixture and up to 50% with an admixture for the production of C-25 concrete without a significant compressive strength loss from the control mix.KeywordsRecycled concrete fine aggregate (RCFA)Recycled aggregate concrete (RAC)Workability of concreteCompressive strength of concrete