Studies on Strength, Density & Workability of Recycled Aggregates Concrete (RAC)

In this study, recycled coarse aggregates (RCA) derived from demolition wastes collected from a landfill site in Gaborone, Botswana, were utilized in place of natural coarse aggregates to make concrete. Construction waste is any type of rubbish generated during the construction process. Various government agencies have certain definitions. CD waste is created during the construction, remodeling, maintenance, and destruction of dwellings, big building structures, roads, bridges, piers, and dams. In a previous study, an in-depth and thorough analysis of previous research into the evaluation of the strength of concrete integrating aggregates from demolished wastes was conducted, and it was concluded that there was a stark absence of results from the South African sub-continent, including Botswana. With reference to the natural coarse aggregate, RCA replacement levels of 0%, 20%, 40%, 60%, 80% and 100% were utilized and the results of hardened concrete tests for compressive and flexural strengths were obtained. The compressive and flexural strengths of recycled aggregate concrete (RAC) were observed to decline with increasing replacement levels of natural coarse aggregates using RCA. It was determined that RCA could only be used as a partial replacement for natural aggregate in concrete up to a specified limit. It was also discovered that the unfavorable qualities of RCA were mostly caused by the quantity and quality of the adhering mortar.