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To mitigate pollution and promote material reuse, natural coarse aggregates are substituted with recycled aggregates. This substitution not only facilitates the reduction of carbon dioxide emissions but also contributes to environmentally friendly practices. This research delves into the criteria for selecting materials suitable for recycled aggregates. The study involved replacing natural aggregates with recycled aggregates at varying percentages (0%, 20%, 40%, 60%, 80%, 100%). The incorporation of recycled aggregates in specific proportions enhanced the properties of both fresh and hardened concrete, particularly up to the optimum percentage, as demonstrated through tests such as the slump test and compressive strength test, splitting tensile strength. Laboratory test results revealed decrease in compressive strength as the percentage of recycled aggregate increases. Nevertheless, up to a 20% replacement level, the mixtures attained the desired mean strength. Consequently, for structural concrete, it is feasible to replace natural aggregates with recycled aggregates within the range of 20%.
Karthik et al. (2024) studied this question.