Effect of Recycled Coarse Aggregate Quality on Compressive Strength of Concrete at Different Replacement Levels
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Recycled Coarse Aggregate (RCA) is produced from the processing of construction and demolition waste and is used as a replacement for Natural Coarse Aggregate (NCA). Waste concrete cylinders from compressive-strength testing in precast concrete factories are readily available but have not been optimally utilized. One potential solution for utilizing this waste is to recycle it into RCA. In previous studies, the quality of the RCA used was generally not known with certainty; therefore, its effect on Recycled Aggregate Concrete (RAC) remains to be further investigated. This study aims to determine the effect of RCA quality on the compressive strength of new concrete. The RCA used in this research consists of six quality levels: RCA67 (f'c = 67 MPa), RCA58 (f'c = 58 MPa), RCA50 (f'c = 50 MPa), RCA30 (f'c = 30 MPa), RCA25 (f'c = 25 MPa), and RCA20 (f'c = 20 MPa). NCA was replaced with RCA at two replacement levels: 50% and 100%. The tests included aggregate properties, slump, compressive strength, and unit weight. The results showed that the compressive strength of Natural Aggregate Concrete (NAC) with 100% NCA was higher than that of RAC with either 50% or 100% RCA. Compared to NAC, the compressive strength of RAC decreased by 14.11%–43.58% with 100% RCA and by 1.53%–13.75% with 50% RCA. The compressive strength of RAC decreased as the quality of RCA decreased. RCA quality had a significant effect on concrete compressive strength at both replacement levels.
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