Abstract
The carbonation treatment of recycled concrete aggregates (RCA) can significantly enhance their properties and reusability. To improve carbonation efficiency, a wet cyclic carbonation method using ethanol solution was proposed to treat RCA and a wet carbon curing method was applied to its product, recycled blocks (RB). The results showed that wet carbonation with 30 % ethanol solution for 10 min significantly reduced RCA’s water absorption and crushing index and increased its apparent density. This is attributed to ethanol’s high carbon-solubilizing properties, which allow the RCA to generate more calcium carbonate precipitates to fill the voids and optimize the pore structure. When the concentration of ethanol solution was increased above 50 %, the improvement was inefficient and limited. In addition, the second cycle of wet carbonation can further improve the properties of RCA. Optimally processed RCA was used to make recycled masonry blocks. The 10 min wet carbonation curing proved beneficial to the mechanical properties of RB and also improved its resistance to shrinkage and salt freeze-thaw. This rapid method enhances RCA construction materials' performance and durability, improving industrial use in sustainable construction materials.
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