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Per Table 3.1 of the source, at a water-cement ratio of 0.50 the time required for capillary channels to become segmented (under moist curing) is approximately:
A{'text': 'About 14 days', 'label': 'A'}
B{'text': 'About 7 days', 'label': 'B'}
C{'text': 'About 3 days', 'label': 'C'}
D{'text': 'About 6 months', 'label': 'D'}
Answer & Solution
Correct answer: A. {'text': 'About 14 days', 'label': 'A'}
1. §3.2 Table 3.1: w/c 0.40 → 3 days; w/c 0.45 → 7 days; w/c 0.50 → 14 days; w/c 0.60 → 6 months; w/c 0.70 → 1 year; above 0.70 → impossible.
2. Hence 0.50 corresponds to about 14 days of moist curing.
_Source: IGNOU ET-522 Block-1 Unit-3 Water, Table 3.1, §3.2, p. 41_
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