Which disadvantage arises when post-tensioned concrete bridge decks experience excessive chloride ion penetration?

💡 Explanation

When chloride ions penetrate post-tensioned decks, pitting corrosion initiates around the steel tendons because the chloride destroys the passive layer protecting the steel, increasing the vulnerability to stress corrosion cracking and fatigue under cyclic loading. Therefore increased fatigue failure risk results, rather than reduced concrete strength, carbonation or thermal effects which involve deterioration of the concrete mass.

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