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प्रश्न
How is gypsum useful in setting and hardening of cement?
थोडक्यात उत्तर
उत्तर
C3A readily combines vvith water and liberates a large amount of heat. The added gypsum retards the dissolution of C3A by forming insoluble calcium sulpho-aluminate 3CaO.Al2O3.xCaS04.7H20. This reaction prevents high concentration of alumina in the cement solution which retards the early initial set of the cement
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Cement - Setting and Hardening of Portland Cement
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