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Which risk increases when concrete pour timing exceeds rebar's 'flash rust' passivation?

A)Increased chloride penetration rate
B)Compromised bond strength integrity
C)Elevated risk of thermal cracking
D)Induced compressive strength reduction

💡 Explanation

Compromised bond strength increases because flash rust converts the rebar surface, using hydrogen embrittlement as the mechanism. This reduces adhesion, therefore weaker composite action occurs, rather than chloride resistance, thermal stress, or reduced compression, which are separate concerns.

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