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Which risk significantly increases when de-icing roadways with excessive calcium chloride?

A)Accelerated corrosion of reinforced concrete
B)Formation of unstable perchlorate compounds
C)Reduced thermal conductivity of asphalt
D)Increased bioaccumulation within local aquifers

💡 Explanation

Excessive chloride concentration promotes *galvanic corrosion*, because the free chloride ions greatly accelerate electron transfer between dissimilar metals within the concrete leading to oxidation of the rebar; therefore corrosion accelerates dramatically, rather than other de-icing problems related to melting point.

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