Abstract: Improving the performance of recycled concrete aggregate (RCA) has important research implications for their wider application in structural engineering. In this study, the RCA was enhanced by the synergistic effect of cement paste-carbonation, and analyzed in comparison with unreinforced, single cement slurry reinforced, and single carbonation reinforced treated RCA. The results showed that the basic properties of RCA after cement slurry-carbonation synergistic strengthening were significantly improved, and the water absorption, crushing value and porosity were reduced by 16.04%, 19.77% and 36.29%, respectively, compared with untreated RCA. In contrast to single reinforcement, the synergistic effect of cement hydration and carbonation can further utilize the carbonation products to repair the adhesion mortar and interfacial transition zone (ITZ) of RCA while reinforcing the RCA surface. It can be clearly stated that the use of cement slurry-carbonation synergistic reinforcement treatment is an effective, environmentally friendly and low-cost method of RCA enhancement.
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2023, Vol. 37 
