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← TechnologyWhich risk sharply increases when concrete column ambient temperature rises beyond design specifications in a bridge?
A)Accelerated creep stress relaxation✓
B)Increased chloride ion diffusion
C)Amplified freeze-thaw degradation
D)Disrupted steel rebar passivation
💡 Explanation
When exceeding design temperatures creep accelerates because increased temperature reduces concrete viscosity, magnifying time-dependent deformation under sustained load stress. Therefore, creep related stress relaxation happens rapidly, rather than effects involving chloride diffusion, freeze-thaw cycles, or rebar stability that change slowly at elevated temperatures.
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