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Which risk increases when excessive humidity penetrates prestressed concrete bridge deck?

A)Electrolytic corrosion of prestressing tendons
B)Aggregate breakdown due to alkali-silica reaction
C)Freeze-thaw damage creating delamination
D)Creep deflection from reduced concrete stiffness

💡 Explanation

When humidity penetrates concrete, chloride ions dissolve and create an electrolyte, promoting corrosion. This electrolytic corrosion attacks the high-strength steel tendons because moisture allows ion transport. Therefore tendon corrosion results, rather than aggregate breakdown, freeze-thaw damage or creep, which involve different chemical and physical mechanisms.

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