The 'nominal cover' to outermost reinforcement in RC columns for 'moderate' exposure (IS 456) is:
Choose the correct answer
10 mm
30 mm for moderate exposure — IS 456 Table 16
25 mm
60 mm
Correct Answer
B. 30 mm for moderate exposure — IS 456 Table 16
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IS 456 Table 16: nominal cover for different exposure conditions. Mild: 20 mm (footings 40 mm); Moderate: 30 mm (columns 30 mm, beams 30 mm); Severe: 45 mm; Very severe: 50 mm; Extreme: 75 mm. Cover = distance from concrete surface to outermost bar face. Purpose: corrosion protection, fire resistance, bond. Durability minimum cover often governs over structural minimum.
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