Since the Egyptian pyramids and the Roman Coliseum were built, mankind has been searching for an affordable, versatile building material, that can be easily manufactured and transported, and, above all, which is durable. Concrete, a mixture of water, cement and different kinds of minerals and rocks, has all these characteristics, which is why it is currently the most-used material in all sorts of structures. However, there is an issue that preoccupies professionals in the construction industry all over the world: the corrosion of steel bars that internally strengthen structures made of reinforced concrete. This situation causes rapid, internal deterioration of frames and may even lead to buildings collapsing.
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Source: Phys.org