Why Gypsum is added after calcination in the manufacture of Portland cement?
A. To prevent flash setting
B. To improve the quality of cement
C. To increase the lime saturation factor
D. None of the mentioned
Answer:A
Why Gypsum is added after calcination in the manufacture of Portland cement?
A. To prevent flash setting B. To improve the quality of cement C. To increase the lime saturation factor D. None of the mentioned
Explanation: Gypsum is added after calcination to prevent the flash setting and it acts as a retarder.