Around two decades ago, an elevated concrete pedestrian walkway collapsed in the U.S.  injuring more than 100 people. Investigation of the incident revealed that CaCl2 (calcium chloride) had been mixed into the grout that filled the holes around the steel bars inside the concrete, resulting in corrosion of the bars, thus weakening the structure. Based on your understanding of corrosion, explain why chloride compounds in steel-reinforced concrete are discouraged by the concrete industry?

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