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Role of calcium on chloride binding in hydrated Portland cement–metakaolin–limestone blends
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 strätlingite 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. ; The Danish Council for Strategic Research is acknowledged for financial support to the LowE-CEM project (No. 11-116724) ; acceptedVersion
Role of calcium on chloride binding in hydrated Portland cement–metakaolin–limestone blends
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 strätlingite 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. ; The Danish Council for Strategic Research is acknowledged for financial support to the LowE-CEM project (No. 11-116724) ; acceptedVersion
Role of calcium on chloride binding in hydrated Portland cement–metakaolin–limestone blends
Shi, Zhenguo (author) / Geiker, Mette Rica (author) / De Weerdt, Klaartje (author) / Østnor, Tone Anita (author) / Lothenbach, Barbara (author) / Winnefeld, Frank (author) / Skibsted, Jørgen (author)
2017-01-01
cristin:1461197
205-216 ; 95 ; Cement and Concrete Research
Article (Journal)
Electronic Resource
English
DDC:
690
Role of calcium on chloride binding in hydrated Portland cement–metakaolin–limestone blends
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