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Which risk increases when chloride ions penetrate a concrete bridge deck with embedded rebar?

A)Accelerated rebar corrosion from depassivation
B)Concrete spalling due to alkali-silica reaction
C)Reduced load capacity from aggregate degradation
D)Fatigue failure from increased traffic vibrations

💡 Explanation

When chloride ions penetrate concrete, depassivation of the rebar's protective oxide layer occurs because chloride ions disrupt the passive layer, leading to accelerated corrosion. Therefore accelerated rebar corrosion results, rather than spalling, load reduction, or fatigue cracking which depend on other degradation mechanisms.

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