Rust Crack ((better))ed -

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Once the steel begins to rust, the resulting iron oxide (rust) occupies a much larger volume—often the original volume of the steel. This expansion exerts massive internal pressure on the surrounding concrete, which has high compressive strength but very low tensile strength. When the internal stress exceeds the concrete's capacity, a crack forms and propagates to the surface. Key Risks of Rust-Cracked Structures rust cracked