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There is no need to be anxious about the longevity of concrete structures. Look at the remaining concrete coaling towers. Built from the mid 1920s the oldest are in their 90s now. And they are not even prestressed. Bridges on high speed rail lines (up to 200 mph) are mostly built as prestressed concrete structures here in Germany. And they not built for just 20 years. AFAIK the contractural live span is 100 years. Regards, Volker (Germany)
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