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(Courtesy of Kingston Technical Software)
It was recognized by the mid 1970s that the corrosion of concrete structures was caused by the corrosion of the reinforcing steel in the concrete which, in turns, was induced by the intrusion of even a small amount of chloride from the deicing salts into the concrete. It is difficult to estimate the cost of these corrosion-related damages to conventionally reinforced and prestressed concrete bridge components in the nation. According to a 1997 report, of the 581,862 bridges in and off the U.S.A. federal-aid system, about 101,518 bridges were rated as structurally deficient. Most of these bridges were not in danger of collapse, but they were likely to be load posted so that overweight trucks will be required to take a longer alternative route. (reference)
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