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ABSTRACT
This study aimed to explore the potential of Recycled Concrete Aggregate (RCA) and Fly Ash as an eco-friendly alternative to Natural Aggregate (NA) and cement in concrete production. The research involved a systematic investigation into how the partial replacement of granite by RCA and impacts various concrete properties and evaluated the effects of incorporating fly ash as a supplementary cementitious material. The research process commenced with a thorough analysis of the particle size distribution of RCA, Fine Aggregate and NCA, followed by specific gravity tests. Slump tests were performed to assess the workability of concrete mixes containing varying proportions of RCA and fly ash. Additionally, compressive strength tests were carried out on these concrete specimens at different curing periods. The research yielded significant insights. Firstly, it revealed that RCA closely resembles NA in various concrete properties. Secondly, the introduction of fly ash substantially improved concrete workability, offering potential advantages for construction processes. Thirdly, concrete density remained relatively stable with fly ash substitution but decreased significantly with RCA incorporation, paving the way for lightweight concrete applications. Lastly, the study demonstrated that concrete strength could be enhanced by up to 30% with fly ash replacement, with the optimal results achieved through a combination of 20% RCA and 30% fly ash substitution. Overall, these findings support the use of RCA and fly ash as sustainable alternatives in concrete production, while also highlighting environmental benefits and cost-saving opportunities in the construction industry. Recommendations include further exploration of mix designs and construction techniques that leverage these materials for more sustainable and innovative concrete solutions.
