Per §10.8 (Step 3, Table 10.6), the approximate ENTRAPPED air content …

Question

Per §10.8 (Step 3, Table 10.6), the approximate ENTRAPPED air content for concrete made with 20 mm maximum size aggregate is:

Accepted Answer

C. {'text': 'About 2.0 percent of concrete volume', 'label': 'C'}

1. Table 10.6 lists entrapped air %: 10 mm aggregate → 3.0; 20 mm → 2.0; 40 mm → 1.0 (% of concrete volume).
2. Entrapped air is distinct from intentionally entrained air; it accounts for imperfect compaction in the mix-design proportioning.
_Source: IGNOU ET-522 Block-3 Unit-10 Concrete Mix Design, Table 10.6, §10.8 Step 3, p. 17_

Answer

{'text': 'About 1.0 percent of concrete volume', 'label': 'A'}

Answer

{'text': 'About 3.0 percent of concrete volume', 'label': 'B'}

Answer

{'text': 'About 5.0 percent of concrete volume', 'label': 'D'}