1.

Ordinary Portland cement (OPC) has been classified into how many grades?(a) 2(b) 3(c) 10(d) 5The question was asked in semester exam.Enquiry is from Grades of Cement topic in portion Materials for Construction of Basic Civil Engineering

Answer» CORRECT choice is (b) 3

For EXPLANATION: There was only ONE grade of OPC before 1987 and was according to IS 269-1976.It was revised in 1991 and IS 1489-1991 included 3 grades namely, 33 grade, 43 grade and 53 grade.


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