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Per §4.7.3, the strength loss in concrete per 1 percent of entrained air is generally reported to be approximately:
A{'text': 'About 0.5 percent per 1 percent air', 'label': 'A'}
B{'text': 'About 5.5 percent per 1 percent air', 'label': 'B'}
C{'text': 'About 2 percent per 1 percent air', 'label': 'C'}
D{'text': 'About 15 percent per 1 percent air', 'label': 'D'}
Answer & Solution
Correct answer: B. {'text': 'About 5.5 percent per 1 percent air', 'label': 'B'}
1. §4.7.3(iii): 'Generally a decrease in strength of 5.5 percent has been found for each percent of air entrainment.'
2. The loss can be partly offset by a lower water/cement ratio at constant workability.
_Source: IGNOU ET-522 Block-1 Unit-4 Admixtures, §4.7.3(iii), p. 51_
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