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Chemical Composition of Cement

Which one of ...

Question

Which one of the following slows down or retards the setting action of cement

A

Sulphur trioxide

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B

Alkaline

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C

Calcium sulphate

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D

Magnesia

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Solution

The correct option is C Calcium sulphate
The retarder is an admixture that slows down the chemical process of hydration so that concrete remains plastic and workable for a longer time than concrete without the retarder. Gypsum (Calcium sulphate) is used as grouting to retard the setting time.

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Similar questions

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?

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

Q. Deficiency of which of the following oxide causes reduction in setting time of cement :

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