Question:
What is the purpose of adding gypsum to cement?
What is the purpose of adding gypsum to cement?
Updated On: Mar 20, 2025
- To give a hard mass
- To facilitate the hydration of cement
- To slow down the process of setting
- To speed up the process of setting
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The Correct Option is C
Solution and Explanation
Gypsum (CaSO$_4\cdot$2H$_2$O) is added to cement to regulate the setting time. Without gypsum, cement would set immediately upon mixing with water, leaving no time for concrete placement.
Gypsum reacts with tricalcium aluminate (C$_3$A) in cement to form insoluble calcium sulfoaluminates, which slows down the hydration reaction.
This delay ensures sufficient time for the mixing, transportation, and placement of concrete before it hardens.
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