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Solubility of Ca(OH)2 and CaSO4·2H2O in the liquid phase from hardened cement paste

✍ Scribed by Weiping Ma; Paul W. Brown; Dexiang Shi

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
590 KB
Volume
22
Category
Article
ISSN
0008-8846

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✦ Synopsis

Calculation of the solubility product constants for Ca(OH)2 and CaSO4.2H20 in pore solutions of hardened cement paste is used as an estimation of saturation. The treatment of solubility data using three models is discussed in this paper. These models are the Greenberg-Copeland model[l], the Brornley model[ 2] and the Pitzer-Mayorga model [3], which are all based on extended Debye-Htickel theory. The models are applied to the estimation of the saturation according to the experimental and calculated results. Experimental results were obtained from concentration measurements of ions present in the solutions while calculations are based on the models. None of the models evaluated appear entirely adequate to calculate Ca(OH)2 and CaSO4.2H20 saturation. According to the models, Ca(OH)2 and CaSO4.2H20 saturation in pore solutions depends strongly on the alkali content of the cement.

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