Why gypsum in cement?
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Gypsum is added to cement to regulate the setting time of cement. Adding gypsum to cement helps prevent flash set, or an unacceptably rapid stiffening of the cement mix. It also acts as an inhibitor for the formation of calcium silicate hydrate, which is responsible for the strength of the cement mix.
Gypsum also contributes in controlling the rate at which the cement hydrates, and it helps increase the strength of the binder