Which risk increases when concrete cover protecting rebar from chloride intrusion decreases below design specification?

💡 Explanation

When concrete cover decreases chloride intrusion accelerates the oxidation of the rebar because reduced cover diminishes diffusion limitations, leading to the built-up of expansive rust. Therefore expansive cracking results, rather than tensile yielding, shear fracture, or bond degradation which involve different failure sequences linked to load.

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