Abstract
The carbonation of cement materials in NaCl solution was evaluated at various NaCl concentrations (0–2.0M). Leaching and carbonation tests were conducted on slurry-mixed ordinary Portland cement (OPC) with NaCl solutions at a solid to liquid ratio of 50g/l in a Teflon reactor under ambient temperature and pressure conditions. After 24-h leaching, the pH of the slurry decreased with increasing NaCl concentration, whereas the Ca concentration slightly increased. The C–S–H content in the reacted samples after 24-h leaching increased in the presence of NaCl. After the carbonation tests, the CaCO3 content in the reacted samples increased by 7.5–18.4wt%, whereas the C–S–H content decreased by 7.1–33.0wt% in the NaCl solutions. The particle size of the precipitated CaCO3 appeared to be decreased as the NaCl concentration was increased to 1M, but increased as the NaCl concentration was further increased to 2M.
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