File:Corrosion T-rex grows from the steel bar in reinforced concrete.pdf

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Corrosion products with the shape of a T-rex grow from the steel bar (white region) in reinforced concrete that is exposed to a corrosive environment.

Summary[edit]

Description
English: SEM image of a corroding steel bar in concrete. This SEM image was taken for a corroding rebar in steel-reinforced concrete exposed to a corrosive environment. The corrosion products gradually formed around the steel bar. The shape of the corrosion products looks like a T-rex, which indicates that the corrosion products can be as aggressive as the T-rex and finally lead to the cracking and spalling of concrete.

This image shows the case of chloride-induced steel corrosion [1], which is the major cause of steel corrosion in reinforced concrete. The concrete material was exposed to a chloride-rich environment and the potential of the steel bar was monitored. After severe corrosion was detected, the material was cut and polished for SEM imaging [2].

Steel corrosion in reinforced concrete has significant economic and societal effects. In Switzerland, it causes a loss of 1000 CHF/min[3]. The better understanding of corrosion products transport and precipitation can help us evaluate corrosion induced damage and ensure the durability of concrete structures.
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Author Zhidongz

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  1. ↑ (2022). "A multi-technique study of corrosion products at the steel--concrete interface under two exposure conditions". Journal of Microscopy 286 (2): 191-197. DOI:https://doi.org/10.1111/jmi.13100.
  2. ↑ (2020). "A laboratory investigation of cutting damage to the steel-concrete interface". Cement and Concrete Research 138: 106229. DOI:https://doi.org/10.1016/j.cemconres.2020.106229.
  3. ↑ (2020). "Korrosionsbedingte Kosten an Ingenieurbauwerken im Schweizer Straßennetz". Beton-und Stahlbetonbau, 115 (6): 448-458. DOI:https://doi.org/10.1002/best.202000004.

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