The 'minimum clear cover' for reinforcement in a RCC beam in severe exposure (IS 456) is:
Choose the correct answer
15 mm (same for all exposures)
45 mm nominal cover in severe exposure per IS 456 Table 16 — protects rebar from corrosive environment
5 mm only
100 mm for all conditions
Correct Answer
B. 45 mm nominal cover in severe exposure per IS 456 Table 16 — protects rebar from corrosive environment
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IS 456 Table 16: Nominal cover = clear cover + tie/stirrup dia. Mild exposure: 20 mm (beams/slabs). Moderate: 30 mm. Severe: 45 mm. Very severe: 50 mm. Extreme: 75 mm. Nominal cover must also meet development length requirement. Nominal cover ≥ maximum bar dia. Severe exposure includes: alternate wetting/drying, buried below aggressive groundwater, permanently saturated. Cover protects rebar from corrosion.
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