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← ScienceWhich outcome weakens concrete structures in seawater environments?
A)Chloride ion penetration-induced reinforcement corrosion✓
B)Alkali-silica reaction expanding internal volume
C)Sulfate attack decalcifying binding agents
D)Freeze-thaw cycles creating propagation cracking
💡 Explanation
Chloride ions from seawater penetrate the concrete and disrupt the passive layer on steel reinforcement, initiating *oxidation*; therefore, corrosion weakens the steel and causes structural damage, rather than the other listed mechanisms affecting the bulk concrete.
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