Question

Gypsum is added into the raw materials during manufacture of cement so that the final product exhibits

• A. retarded initial setting time
• B. improved modulability for cornices, etc.
• C. increased compressive strength
• D. augmented bond strength

Answer 1

The correct option is A retarded initial setting time

The compound $C_{3}A$ is fast reacting with water and leads to an immediate stiffening of paste and this process is called flash set. The role of gypsum added in the manufacture of cement is to prevent such a fast reaction.