alleryStart learning →The minimum specific surface (by Blaine air permeability) prescribed for Ordinary Portland Cement (33 Grade OPC, IS-269-1989) is:
A150 m-square per kg
B300 m-square per kg
C225 m-square per kg
D400 m-square per kg
Answer & Solution
Correct answer: C. 225 m-square per kg
1. Table 1.5 (Physical Properties of Cements) gives 225 m²/kg as the minimum specific surface for OPC IS-269-1989 (33 Grade), 43 Grade (IS-8112-1989) and 53 Grade (IS-12269-1987).
2. Low heat cement at 320, rapid hardening at 325, Portland Pozzolana at 300, hydrophobic at 350, and super sulphated at 400 are higher.
_Source: IGNOU ET-522 Block-1 Unit-1 Cement, Table 1.5, §1.9, p. 13_
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