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The chemistry behind Brazil's concrete corrosion threat

Original: # Brazil The science behind the threat begins with chemistry. Steel bars embedded in concrete are protected by a passive

In Brazil, discussion is turning to the science of concrete degradation. Steel bars embedded in concrete are protected by a passive oxide film sustained by the high alkalinity of the concrete's pore solution. Carbon dioxide from the atmosphere diffuses into the concrete and reacts with the cement, lowering that alkalinity and stripping the steel of its protection, which opens the way to corrosion and structural weakening.

Why now: Rising concern about how carbon dioxide-driven carbonation threatens the durability of concrete infrastructure in Brazil

Brazilconcretecarbon dioxidesteel reinforcement

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Evidence

• # Brazil The science behind the threat begins with chemistry. Steel bars embedded in concrete are protected by a passive oxide film sustained by the high alkalinity of the pore solution. Carbon dioxide from the atmosphere diffuses into the concrete & reacts with the cement… · Snoro · 5

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