Abstract
The extraction of OH −, Cl −, K + and Ca 2+ ions from ground samples of hardened cement pastes by water was studied, as well as the conditions affecting it. Cement pastes from Portland cement containing various dosages of KCl and the addition of condensed silica fume (SF) were used in the test. The variable parameters adopted during the water extraction were the solid-to-water ratio, the fineness of a sample, and the extraction time. It was found that in cases where extraction was accomplished with the addition of small amounts of water, the quantity of the leached out Cl − and OH − ions within 24 h was almost independent of the fineness of the crushed samples. The quantity of extracted ions changes with each type of ion as well as with the sample-to-water ratio itself. The chemical composition of the water leachates reflects the composition of the hardened cement paste samples. A method for assessing the Cl −/OH − ratio in a pore solution of hardened cement paste based on extrapolation of the results obtained during the water extraction is proposed.
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