Which risk increases significantly when insufficient concrete cover exists around reinforcing rebar in bridge support columns?

💡 Explanation

When concrete cover is insufficient, chloride ions from road salt or seawater can easily penetrate to the rebar surface causing pitting corrosion because of an electrochemical reaction, leading to section loss. Therefore, accelerated corrosion results, rather than buckling, altered Coefficient of Thermal Expansion, or concrete crushing, which would require different mechanisms.

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