Question

After burning of raw materials, Portland cement involves blending with ______

(a) 3% baryte

(b) 3% anhydrite

(c) 3% hanksite

(d) 3% gypsum

This question was posed to me during an online exam.

I need to ask this question from Cements, Metallurgical Coke and Synthetic Resins topic in chapter Miscellaneous Materials of Engineering Material & Metallurgy

Answer 1

Right option is (d) 3% gypsum

For explanation: Raw materials are ground to 200 mesh and burnt in a cement kiln. After burning, the resultant, called clinker, is ground to 325 mesh and blended with 3% gypsum. It is then stored in a cement silo, ready for use.