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The paste hydration of C 3 S containing different amounts of gypsum was studied. Reaction rates and the composition of hydrated products were evaluated. The gypsum influenced the quantity and quality of the hydrated products by accelerating the hydration process and, at the same time, lowering the intrinsic strength of the gel. Variations in intrinsic strength correlated linearly with the C/S ratio of the CSH gel. The effect of gypsum on strength was interpreted in terms of its influence on the extent of hydration and on the chemical composition of the gel.
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A. Bentur (1976) studied this question.
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