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 CaCO 3 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 CaCO 3 appeared to be decreased as the NaCl concentration was increased to 1M, but increased as the NaCl concentration was further increased to 2M.
Bibliographical noteFunding Information:
This work was supported by the Korea Institute of Geoscience and Mineral Resources (KIGAM) (Utilization and sequestration of CO 2 by using industrial minerals). We greatly appreciate the anonymous reviewers for the valuable comments to improve the quality of this manuscript.
Copyright 2012 Elsevier B.V., All rights reserved.
- Carbon dioxide
- Cementitious materials
- Sodium chloride
ASJC Scopus subject areas
- General Chemistry
- General Chemical Engineering
- Industrial and Manufacturing Engineering