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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) Clay |
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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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