The addition of gypsum to cement clinker during grinding:

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Gypsum (CaSO₄·2H₂O) is added to clinker to control the rapid reaction of tricalcium aluminate with water, which would otherwise cause flash (quick) setting. Gypsum slows down the hydration of C₃A, thus increasing the setting time and allowing workability. Without gypsum, cement would set almost immediately upon mixing with water, making placement impossible.

The addition of gypsum to cement clinker during grinding: MCQ with Answer and Explanation

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