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Which failure mode escalates because of **differential thermal expansion** after concrete spalling exposes rebar in a reinforced concrete bridge deck?

A)Accelerated chloride-induced corrosion
B)Catastrophic shear crack propagation
C)Reduced freeze-thaw spalling rate
D)Increased composite load capacity

💡 Explanation

Chloride-induced corrosion accelerates because the mechanism of chlorides penetrating the concrete weakens the passive layer on the steel, enabling oxidation. Therefore, the steel corrodes more rapidly when exposed, rather than experiencing benefits from slower spalling rates or increased composite action.

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