Dean McCartney

Concrete is a strong construction material in it own right but the innovation of steel reinforcement in the 19th century added strength and sped up construction times. While these structures were originally predicted to last hundreds of years, it was later found that this expectancy can be closer to 50-100 years with the possibility of decaying in as little as 10 years.

There are alternatives in place but not none seem to address the major issue at hand:

There are technologies that can address the problem of steel corrosion, such as cathodic protection, in which the entire structure is connected to a rust-inhibiting electric current...Fundamentally, however, none of these developments can resolve the inherent problem that putting steel inside concrete ruins its potentially great durability.

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