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An excess of magnesium oxide after 5% is harmful to cement.(a) True(b) FalseI had been asked this question in my homework.This key question is from Ingredients of Cement in portion Materials for Construction of Basic Civil Engineering

Answer»

The CORRECT option is (a) True

Explanation: Excess of magnesium causes PROBLEMS in structures built with this cement.It causes cracks in both MORTAR and concrete after they HARDEN.



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