Which outcome occurs when concrete alkalinity reduces around embedded reinforcing steel (rebar)?

💡 Explanation

When concrete alkalinity decreases (carbonation), the passive oxide layer protecting the rebar is destroyed (depassivation) because high pH is required to maintain this layer, leading to accelerated corrosion. Therefore, accelerated rebar corrosion results, rather than spalling, reduced compression, or decreased tensile strength, requiring other chemical conditions.

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