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Per §3.2, full hydration in a sealed concrete specimen is possible only when the mixing water is AT LEAST:
A{'text': 'About one-tenth the chemical-reaction water', 'label': 'A'}
B{'text': 'About 25 percent of cement weight', 'label': 'B'}
C{'text': 'About twice the chemical-reaction water (w/c about 0.5)', 'label': 'C'}
D{'text': 'About four times the chemical-reaction water', 'label': 'D'}
Answer & Solution
Correct answer: C. {'text': 'About twice the chemical-reaction water (w/c about 0.5)', 'label': 'C'}
1. §3.2: 'full hydration in a sealed specimen is possible only when the mixing water is at least twice the water required for chemical reaction i.e. the mix has a water-cement ratio of about 0.5 by weight.'
2. A w/c below 0.5 will not allow full hydration in a sealed specimen.
_Source: IGNOU ET-522 Block-1 Unit-3 Water, §3.2, p. 41_
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