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Gypsum is added in the cement production process mainly for the purpose of regulating setting time of Cement. It prevents flash setting and makes the concrete workable for hours.

Gypsum added to cement during final grinding provides sulphate to react with C₃A to form ettringite (calcium trisulfoaluminate). This controls the hydration of C₃A.Without sulphate, cement would set rapidly.

In addition, It helps in drying shrinkage properties and strength development.

FAQ

Why amount of Gypsum to be added to the cement clinker has to be carefully watched?

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