Concrete exhibits high alkaline properties with a pH value around 12 to 13. This high-alkaline environment creates a microscopic passive film of ferric oxide on the rebar, shielding it from rust.
Over decades, atmospheric carbon dioxide diffuses into the concrete, slowly lowering its pH value closer to neutral. Once this carbonated layer reaches the steel surface, the passive film dissolves, making high-purity steel essential to avoid rapid degradation.
This highlights why high-quality, dense concrete paired with low-impurity, premium TMT rebars is absolutely essential for structures designed to last
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