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Commercial buildings live hard lives. Floors get loaded, roofs heat and cool, parking structures freeze, thaw, and get salted. Concrete does a remarkable job for a long time, but steel does not get that same patience when water and chloride ions find their way to reinforcement. When corrosion starts, it is rarely a single event. It is a chain of small failures that eventually show up as cracking, rust staining, soft concrete, and spalling repair patches that look worse than