Effect of Chloride-Induced Steel Corrosion on Working Life of Concrete Structures
| Autor: | Juraj Bilčík, Ivan Hollý |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Working life
Materials science Metallurgy 0211 other engineering and technologies Reinforcement corrosion 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Chloride Atomic and Molecular Physics and Optics Corrosion 021105 building & construction medicine General Materials Science 0210 nano-technology medicine.drug |
| Zdroj: | Solid State Phenomena. 272:226-231 |
| ISSN: | 1662-9779 |
| Popis: | The reinforcing steel embedded in concrete is generally protected against corrosion by the high alkalinity (pH = 12.5 to 13.5) of the concrete pore solution. The structural degradation of concrete structures due to reinforcement’s corrosion has an impact on the safety, serviceability and durability of the structure. The corrosion of reinforcements in the construction of a transport infrastructure (especially bridges), parking areas, etc., is primarily initiated by chlorides from de-icing salts. When corrosion is initiated, active corrosion results in a volumetric expansion of the corrosion products around the reinforcing bars against the surrounding concrete. Reinforcement corrosion causes a volume increase due to the oxidation of metallic iron, which is mainly responsible for exerting the expansive radial pressure at the steel–concrete interface and development of hoop tensile stresses in the surrounding concrete. When this tensile stress exceeds the tensile strength of the concrete, cracks are generated. Higher corrosion rates can lead to the cracking and spalling of the concrete cover. Continued corrosion of reinforcement causes a reduction of total loss of bond between concrete and reinforcement. |
| Databáze: | OpenAIRE |
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