Question:
Gypsum is added to cement to:
Gypsum is added to cement to:
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Gypsum prevents flash setting of cement by retarding the rapid hydration of \(C_3A\).
Updated On: May 7, 2026
- Accelerate setting
- Retard setting
- Increase strength
- Reduce heat of hydration
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The Correct Option is B
Solution and Explanation
Concept:
Gypsum is added to cement to control the setting time. Without gypsum, cement may set very quickly due to rapid reaction of \(C_3A\).
Step 1: Cement contains tricalcium aluminate: \[ C_3A \]
Step 2: \(C_3A\) reacts very fast with water.
Step 3: If this reaction is not controlled, flash setting occurs.
Step 4: Gypsum slows down the reaction of \(C_3A\), thereby increasing the setting time. Therefore, gypsum is added to cement to: \[ \boxed{\text{Retard setting}} \]
Step 1: Cement contains tricalcium aluminate: \[ C_3A \]
Step 2: \(C_3A\) reacts very fast with water.
Step 3: If this reaction is not controlled, flash setting occurs.
Step 4: Gypsum slows down the reaction of \(C_3A\), thereby increasing the setting time. Therefore, gypsum is added to cement to: \[ \boxed{\text{Retard setting}} \]
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