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← ScienceWhich consequence results when high humidity exposes concrete pre-stressed with steel tendons?
A)Tendons corrode via chloride diffusion✓
B)Alkali-silica reaction causes concrete expansion
C)Carbonation reduces concrete alkalinity
D)Sulfate attack degrades cement paste
💡 Explanation
Corrosion weakens tendons, diminishing structural integrity, because dissolved salts facilitate **ionic conduction**, accelerating oxidation. This occurs at the steel surface; chloride ions accumulate through diffusion, therefore, reducing the passivating layer, rather than causing reactions throughout the cement itself.
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