Question

What is the function of adding gypsum to clinker cement ?

Answer 1

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Gypsum is called the retarding agent of cement which is mainly used for regulating the setting time of cement and is an indispensable component.
Gypsum is a mineral and is hydrated calcium sulfate in chemical form. Gypsum plays a very important role in controlling the rate of hardening of the cement.

Answer 2

1. The retarding agent of cement is Gypsum, mainly used for regulating the setting of cement.

2. Gypsum is otherwise known as hydrated calcium sulphate. Gypsum plays a vital role in controlling the rate of hardening of cement.

3. When added water to cement, the gypsum reacts ${ C }_{ 3 }A$ to generate calcium sulfoaluminate hydrate, this forms as a protecting layer and delays the setting time of cement

4. During the cement manufacturing process, upon the cooling of clinker, a small amount of gypsum is introduced during the final grinding process.

5. The addition of gypsum is for setting of cement. If gypsum is not used then the cement will dry out immediately after mixing of water without any time for concrete placing.