Question

What is the role of gypsum, $CaSO_{4}.2H_{2}O$ in setting of cement ? Identify the correct option from the following :

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

Answer 1

Answer: (D)

to slow down the setting process

Answer 2

The purpose of adding gypsum is only to slow down the process of setting of cement so that it gets sufficiently hardened