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The effect of the kind of calcium sulfate on the hydration of CSA cements was investigated. Thermal anhydrite, gypsum and a combination of anhydrite with gypsum were used at a constant molar ratio gypsum/ye’elimite of 0.8. With gypsum, ye’elimite dissolved faster than with anhydrite. When approximately 20mass-% of anhydrite were replaced by gypsum, ye’elimite dissolution was as fast as in the system...
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