Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 65, Issue -, Pages 67-75Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2014.04.095
Keywords
Carbonation; Phase component; Ca(OH)(2); CaCO3; Semi-carbonation zone; pH value
Categories
Funding
- National Science Foundation of China [51178455]
- Science Foundation of Jiangsu [BK2011221]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Jiangsu Overseas Research & Training Program for University Prominent Young & Middle-aged Teachers and Presidents
- NSFC
- SFJ
- PAPD
- ORTP
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An accelerated carbonation experiment was carried out under artificial environment with high CO2 dosing to investigate the concentration distributions of the Ca(OH)(2) and CaCO3 by chemical analysis methods as well as the pH value profiles. The results indicate that the distributions of phase components are not consistent with that of the pH value in corresponding zone of carbonated concrete. The cross section of carbonation concrete shows complete carbonation zone, semi-carbonation zone with variable pH value, semi-carbonation zone with constant pH value, and non-carbonation zone. In the light of formation sequence of semi-carbonated zone and completely carbonated zone, the development process of concrete carbonization is divided into three stages: (1) from the beginning of carbonation to the point when pH on concrete surface starts to decrease; (2) from the point when pH on concrete surface starts to decrease to the point when the alkaline component is depleted; (3) from the point when the alkaline component is depleted to any time. (C) 2014 Elsevier Ltd. All rights reserved.
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