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Per §8.4.3, the fire resistance of reinforced concrete depends primarily on the type of concrete AND on the:
A{'text': 'Cover provided to the steel reinforcement', 'label': 'A'}
B{'text': 'Colour of the concrete surface coating', 'label': 'B'}
C{'text': 'Floor-level number of the structure', 'label': 'C'}
D{'text': 'Brand of cement used', 'label': 'D'}
Answer & Solution
Correct answer: A. {'text': 'Cover provided to the steel reinforcement', 'label': 'A'}
1. §8.4.3: 'In the case of reinforced concrete, the type of concrete and cover to reinforcement play a major role. The high temperature gradient causes differential expansion and separation between surface and interior. Heating of reinforcement and consequent expansion causes loss of bond and loss of strength of reinforcement.'
2. Hence design codes specify cover thicknesses for given fire-resistance grades.
_Source: IGNOU ET-522 Block-2 Unit-8 Durability of Concrete, §8.4.3, p. 73_
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