alleryStart learning →Per Table 10.5 (durability in mix design), the MINIMUM cement content for REINFORCED concrete in 'severe' exposure is:
A220 kg/m³ at w/c ≤ 0.7
B250 kg/m³ at w/c ≤ 0.65
C290 kg/m³ at w/c ≤ 0.55
D360 kg/m³ at w/c ≤ 0.45
Answer & Solution
Correct answer: D. 360 kg/m³ at w/c ≤ 0.45
1. Table 10.5: Reinforced concrete cement minima and max w/c — Mild: 250 kg/m³, 0.65; Moderate: 290, 0.55; Severe: 360 kg/m³, w/c ≤ 0.45.
2. The same severity row caps plain concrete at 310 kg/m³ at w/c ≤ 0.5.
_Source: IGNOU ET-522 Block-3 Unit-10 Concrete Mix Design, Table 10.5, §10.8 Step 2, p. 17_
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