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What is the required minimum fineness for grade 53 OPC?

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What is the required minimum fineness for grade 53 OPC?

(a) 370 m^2/kg

(b) 370 cm^2/g

(c) 580 m^2/kg

(d) 580 cm^2/g

I had been asked this question during an online exam.

This interesting question is from Grades of Cement topic in division Materials for Construction of Basic Civil Engineering

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Right option is (a) 370 m^2/kg

The explanation is: The value is in accordance with the IS code 12269 for 53 grade OPC.  Table 3 gives physical requirements and fineness is one of them.

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