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Per §3.4, sea water typically reduces the 28-day strength of concrete by the order of:
A{'text': 'Negligible — under 1 percent', 'label': 'A'}
B{'text': 'More than 80 percent', 'label': 'B'}
C{'text': 'About 40 to 50 percent', 'label': 'C'}
D{'text': 'About 10 to 15 percent', 'label': 'D'}
Answer & Solution
Correct answer: D. {'text': 'About 10 to 15 percent', 'label': 'D'}
1. §3.4 states: 'The reduction in strength of concrete may be of the order of 10 to 20 percent.' Later in the same section: 'sea water slightly accelerates the setting time… But it reduces 28 days strength of concrete by about 10 to 15 percent.'
2. The loss can be partly compensated by redesigning the mix.
_Source: IGNOU ET-522 Block-1 Unit-3 Water, §3.4, p. 43_
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