Which long-term risk is intensified when chloride ions permeate prestressed concrete bridge girders?

💡 Explanation

When chloride ions permeate prestressed concrete, they promote localized corrosion because they disrupt the passive oxide layer on the high-strength steel, enabling hydrogen absorption that embrittles the steel. Therefore hydrogen embrittlement results, rather than fretting fatigue, alkali-silica reaction, or carbonation-based spalling, which require different chemical conditions.

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