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ABSTRACT
This study investigated the compressive strength performance of concrete incorporating recycled coarse aggregate (RCA) at replacement levels of 0%, 5%, 15%, and 25%, measured over 7, 14, and 28 days of curing. The results provided valuable insights into how RCA affects the workability, density, and strength development of concrete, highlighting both the potential benefits and limitations of using RCA as a sustainable alternative to natural aggregates. The findings indicate that early-age strength (7 days) was higher in RCA-modified mixes compared to the control mix (0% RCA). The 5% RCA mix exhibited the highest early compressive strength (31.867 N/mm²), followed closely by the 15% RCA mix (31.41 N/mm²) and the 25% RCA mix (28.607 N/mm²). This suggests that RCA can contribute to initial strength development, possibly due to enhanced cement hydration from RCA’s high water absorption capacity. However, beyond 7 days, a general trend of strength reduction was observed in all RCA mixes, indicating potential long-term durability concerns.
