The minimum specific surface (by Blaine air permeability) prescribed for Ordinary Portland Cement (33 Grade OPC, IS-269-1989) is:
A{'text': '150 m-square per kg', 'label': 'A'}
B{'text': '300 m-square per kg', 'label': 'B'}
C{'text': '225 m-square per kg', 'label': 'C'}
D{'text': '400 m-square per kg', 'label': 'D'}
Answer & Solution
Correct answer: C. {'text': '225 m-square per kg', 'label': 'C'}
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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