Journal
CEMENT AND CONCRETE RESEARCH
Volume 95, Issue -, Pages 205-216Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2017.02.003
Keywords
Chloride (D); Metakaolin (D); pH (A); Calcium-silicate-hydrate (C-S-H) (B); Thermodynamic calculations (B)
Funding
- Danish Council for Strategic Research [11-116724]
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Chloride binding is investigated for Portland cement-metakaolin-limestone pastes exposed to CaCl2 and NaCl solutions. The phase assemblages and the amount of Friedel's salt are evaluated using TGA, XRD and thermodynamic modeling. A larger amount of Friedel's salt is observed in the metakaolin blends compared to the pure Portland cement. A higher total chloride binding is observed for the pastes exposed to the CaCl2 solution relative to those in the NaCl solution. This is reflected by the fact that calcium increases the quantity of Friedel's salt in the metakaolin blends by promoting the transformation of stratlingite and/or monocarbonate to Friedel's salt. Calcium increases also the amount of chloride in the diffuse layer of the C-S-H for the pure cement A linear correlation between the total bound chloride and the uptake of calcium from the CaCl2 solution is obtained and found to be independent on the type of cement blend. (C) 2017 Elsevier Ltd. All rights reserved.
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