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Per Table 8.9 (recommendations of ACI Committee 224), the maximum permissible crack width for reinforced concrete exposed to SEAWATER (or seawater spray + wetting/drying) is:
A{'text': '0.03 mm', 'label': 'A'}
B{'text': '0.30 mm', 'label': 'B'}
C{'text': '0.15 mm', 'label': 'C'}
D{'text': '0.50 mm', 'label': 'D'}
Answer & Solution
Correct answer: C. {'text': '0.15 mm', 'label': 'C'}
1. Table 8.9 lists permissible crack widths: dry or protective membrane 0.03 mm; humidity, moist air, soil 0.30 mm; de-icing chemicals 0.18 mm; seawater and seawater spray, wetting and drying 0.15 mm; water retaining structures 0.09 mm.
2. Hence the seawater limit is 0.15 mm.
_Source: IGNOU ET-522 Block-2 Unit-8 Durability of Concrete, Table 8.9, §8.7, p. 77_
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