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Abstract
This paper investigates the feasibility of using recycled concrete aggregate (RCA) as a replacement to the natural aggregates (NAs) in hot mix asphalt (HMA). RCA was collected from two different sources (new concrete cubes used for quality control testing during construction, and old demolished building) to investigate the impact of material degeneration on the engineering properties of the mix. Basic engineering properties were determined for both RCA and bitumen for the preparation of HMA mixes. Different mix designs were conducted using the conventional Marshall method with 100% RCA or substituting the coarse natural aggregates (retained on the US Standard Sieve No. 4) by RCA. Performance of the investigated mixes in terms of stability, flow, loss in abrasion, loss of stability, and indirect tensile strength was evaluated.