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← TechnologyWhich mechanical outcome occurs when a concrete casting of reinforced-steel building columns experiences prolonged cryogenic temperatures?
A)Increased load-bearing capacity
B)Spalling and structural weakening✓
C)Enhanced seismic resilience
D)Complete corrosion prevention
💡 Explanation
Spalling and structural weakening occur because differential thermal contraction induces stress beyond material limits. The mechanism is differential thermal expansion; concrete and steel shrink at different rates. Therefore, stress fractures occur, rather than maintaining structural integrity under load.
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