why grading of cement is like 33,43,53?why not 25,35,45?

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why grading of cement is like 33,43,53?why not 25,35,45?..

Answer / karthik

33/43/53 is a compressive strength of cement which we achieved at 28 days.The grade is changes due to the percentage of other components in cement.Its a technically achieved value it not like any codes.

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