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What is the purpose of adding gypsum (CaSO4*2H2O) to cement during its manufacture?

1. To slow down the process of setting of the cement
2. To fasten the process of setting of the cement
3. Not to affect the process of setting of the cement by any means
4. None of these

Correct answer: To slow down the process of setting of the cement

Solution

Gypsum is added to cement clinker to retard the setting process by forming ettringite (calcium sulfoaluminate hydrate) on the surface of tricalcium aluminate particles, slowing down their hydration and giving adequate working time.

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