What is the role of gypsum, `CaSo_4.2H_2O` in setting of cement? Identify the correct option from the following:

Options

A. To provide water molecules for hydration process
B. To help to remove water molecules
C. To slow down the setting process
D. To fasten the setting process

Answer

C

Explanation

The purpose of adding gypsum is only to slow down the process of setting of cement so that it gets sufficients hardened. Without gypsum, cement clinker can condense immediately by mixing with water and release heat.