alleryStart learning →Per IS 269-1989, the insoluble residue percentage by mass in ordinary Portland cement shall not be greater than:
A1 percent
B8 percent
C4 percent
D15 percent
Answer & Solution
Correct answer: C. 4 percent
1. The IS 269-1989 chemical requirements listed at the top of p. 7 of the source state: 'Insoluble residue percent by mass is not greater than 4 percent.'
2. The same list caps magnesia at 6%, total loss on ignition at 5% and gives the lime saturation factor range.
_Source: IGNOU ET-522 Block-1 Unit-1 Cement, §1.3 (IS 269-1989 chemical requirements), p. 7_
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