期刊
CEMENT AND CONCRETE RESEARCH
卷 65, 期 -, 页码 30-40出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2014.07.007
关键词
Chloride binding; Portland cement paste; Sulphate; SEM-EDS; pH
The effect of magnesium and sulphate present in sea water on chloride binding in Portland cement paste was investigated. Ground well hydrated cement paste was exposed to MgCl2, NaCl, NaCl + MgCl2, MgSO4 + MgCl2 and artificial sea water solutions with a range of concentrations at 20 degrees C. Chloride binding isotherms are determined and pH of the solutions were measured. A selection of samples was examined by SEM-EDS to identify phase changes upon exposure. The experimental data were compared with calculations of a thermodynamic model. Chloride binding from sea water was similar to chloride binding for NaCl solutions. The magnesium content in the sea water lead to a slight decrease in pH, but this did not result in a notable increase in chloride binding. The sulphate present in sea water reduces both chloride binding in C-S-H and AFm phases, as the C-S-H incorporates more sulphates instead of chlorides, and part of the AFm phases converts to ettringite. (C) 2014 Elsevier Ltd. All rights reserved.
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