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Which of the following cannot be added in 33 grade OPC after burning stage?(a) Gypsum(b) Water(c) Colouring Agents(d) ClayI got this question during an internship interview.My enquiry is from Grades of Cement in division Materials for Construction of Basic Civil Engineering

Answer»

The correct answer is (d) Clay

Explanation: The details and specifications regarding the manufacture of 33 GRADE OPC are mentioned in IS 269.It says that after burning, only CERTAIN element like gypsum, water, PERFORMANCE enhancers, colouring agent can be added.More RAW material-clay cannot be added.



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