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Which risk increases when thermal cycling occurs extensively in post-tensioned concrete beams used in bridge construction?

A)Debonding at the grout interface
B)Reduction in Young's modulus of rebar
C)Increased chloride permeability resistance
D)Higher steel fatigue strength

💡 Explanation

Debonding at the grout interface increases because differential thermal expansion causes cyclic stress concentrations which exceed bond strength, leading to progressive loss of adhesion; therefore interfacial cracks form, rather than uniform expansion which enhances element integrity.

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