Journal
MAGAZINE OF CONCRETE RESEARCH
Volume 68, Issue 7, Pages 353-363Publisher
ICE PUBLISHING
DOI: 10.1680/jmacr.15.00234
Keywords
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Funding
- EU Research Council [FP7-PEOPLE-2011-IRSES-294955]
- National Natural Science Foundation of China [51108415]
- China Scholarship Council [201208330319]
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In this paper an experimental study is presented on the interaction between concrete carbonation and chloride attack. The experiments are carried out on chloride-contaminated cement pastes that have been exposed to a carbon dioxide environment. Free and total chloride contents at different carbonation times are measured in the tested specimens using traditional leaching and acid-soluble methods. Bound chloride contents are calculated from the measured total and free chlorides. The experimental data show that the carbonation of cement paste results in a release of bound chlorides, which is related to not only the decomposition of Friedel's salt, but also the decomposition of calcium-silicate-hydrate (C-S-H) gel. Based on the obtained experimental results, a numerical model is also developed for simulating the carbonation process of the chloride-contaminated cement paste. The model can be used to explain how the bound chlorides are released in a chloride-contaminated cement paste under the influence of carbonation reactions.
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