By adding excess Gypsum to cement,

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(B) The raw materials for cement are limestone,clay,and gypsum. Cement is a greyish heavy powder containing calcium aluminates and silicates. Gypsum $

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Setting time of cement becomes more

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(B) The raw materials for cement are limestone,clay,and gypsum. Cement is a greyish heavy powder containing calcium aluminates and silicates. Gypsum $(CaSO_4 \cdot 2H_2O)$ is added to the cement clinker during the grinding process to increase the setting time of cement,which allows it to be placed and hardened properly. The setting of cement is an exothermic process involving the hydration of calcium aluminates and silicates. Adding gypsum slows down the initial hydration reaction.

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