Gypsum is added to cement because:

it makes the cement very hard

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it increases the pace of setting of cement

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it slows down the initial setting of cement when water is added

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none of the above

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Solution

The correct option is C it slows down the initial setting of cement when water is added
Gypsum plays an important role in controlling the rate of hardening of the cement. During cement manufacturing process upon cooling of clinker a small amount of gypsum is added during the final grinding process. Gypsum controls the setting of the cement and if not added the cement will set immediately leaving no time for concrete placing.

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Similar questions

By adding gypsum to cement
(a) setting time of cement becomes less
(b) setting time of cement increases
(c) colour of cement becomes light
(d) shining surface is obtained

Q. Assertion :Gypsum is added to powdered clinkers to get cement. Reason: Addition of gypsum to clinker decreases its setting time and thus cement hardens readily on mixing with water.

Q. Consider the following statements regarding 'setting of cement'.
1. Low-heat cement sets faster than OPC.
2. Final setting time decides the strength of cement.
3. Initial setting time of Portland Pozzolana is 30 minutes.
4. Air-induced setting is observed when stored under damp conditions.
5. Addition of gypsum retards the setting time.
Which of the above statements are correct?

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Q. To prevent flash setting of cement, which of the following is added to cement?

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