This study assessed the efficacy of water leach tests (WLTs) and pH-static leach tests in evaluating the leaching behavior of distinctly carbonated recycled concrete aggregates (RCA). The leaching of barium (Ba), calcium (Ca), chromium (Cr), magnesium (Mg), and sulfate (SO4) from seven RCA samples were studied. WLTs at several liquid-to-solid ratios (L/S) and pH-static leach tests were conducted to examine the effects of carbonation on the release of elements. In addition, a novel experimental approach was introduced to gauge the impact of moisture
saturation on the leaching attributes of RCA. The saturation effect on the leaching potential was explored by inducing eight different matric suctions in laboratory-compacted RCA cores. Moreover, geochemical modeling was performed to evaluate the leaching mechanisms of the
elements. Results showed that a carbonation-based leaching assessment of RCA could be premised on laboratory WLTs and pH-static leach tests.