Question

Gypsum is added in the manufacture of Portland Cement:

• A. While mixing the raw materials
• B. At the end of grinding the clinker into powder
• C. During burning in the rotary kiln
• D. At the beginning of the grinding the clinker.

Answer 1

The correct option is B At the end of grinding the clinker into powder

Ans. (b) While grinding the clinker, about 3% gypsum is added to coat the cement particles by interfering with the process of hydration of the cement particles.