Which structural deficiency arises when concrete chloride concentration exceeds critical threshold near rebar?

💡 Explanation

When chloride concentration exceeds a threshold at rebar depth, depassivation occurs because chloride ions disrupt the protective oxide layer, accelerating electrochemical corrosion and causing concrete cracking (spalling). Therefore, spalling results rather than affecting concrete compressive strength, tensile strain, or heat deflection, which involve different breakdown mechanisms.

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