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Per §7.4, a rise in temperature affects the bond strength between concrete and steel. At 200°C to 300°C the bond strength typically:
A{'text': 'Roughly doubles relative to room temperature', 'label': 'A'}
B{'text': 'Remains essentially the same as room temperature', 'label': 'B'}
C{'text': 'Vanishes completely, with bond reaching zero', 'label': 'C'}
D{'text': 'Falls to about one-half of room-temperature value', 'label': 'D'}
Answer & Solution
Correct answer: D. {'text': 'Falls to about one-half of room-temperature value', 'label': 'D'}
1. §7.4 reads: 'A rise in temperature reduces bond strength. At 200° to 300°C there may be loss of one-half of the bond strength compared to that at room temperature.'
2. This is a key reason for fire-resistance cover requirements in reinforced concrete.
_Source: IGNOU ET-522 Block-2 Unit-7 Strength of Concrete, §7.4, p. 54_
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