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Per §3.2, for water-cement ratios above approximately 0.7 the capillary system in concrete:
A{'text': 'Closes within 3 days under any curing', 'label': 'A'}
B{'text': 'Will not be blocked even by complete hydration', 'label': 'B'}
C{'text': 'Reduces strength by under 5 percent', 'label': 'C'}
D{'text': 'Is irrelevant to concrete durability', 'label': 'D'}
Answer & Solution
Correct answer: B. {'text': 'Will not be blocked even by complete hydration', 'label': 'B'}
1. §3.2 states: 'For water-cement ratios above about 0.7, even complete hydration would not produce enough gel to block all the capillaries.'
2. The same paragraph notes that for extremely fine cement the maximum w/c may go up to 1.0 and for coarse cement may be below 0.7.
_Source: IGNOU ET-522 Block-1 Unit-3 Water, §3.2, p. 41_
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