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Per §4.7.4, the dosage of air entrainment for ordinary concrete should generally be kept within the range:

A0.1 to 0.5 percent of the mix
B10 to 12 percent of the mix
C2 to 6 percent of the mix
D15 to 20 percent of the mix
Answer & Solution
Correct answer: C. 2 to 6 percent of the mix
1. §4.7.4 closes: 'In any case air entrainment should not be less than 2 percent and more than 6 percent.' 2. For mass concreting 2-3 percent is recommended; thin sections take 5-6 percent; reinforced concrete typically 3-4 percent. _Source: IGNOU ET-522 Block-1 Unit-4 Admixtures, §4.7.4, p. 51_
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