Inspection and Assessment of Corrosion in Pretensioned Concrete Bridge Girders Exposed to Coastal Climate
| Autor: | Karla Hornbostel, Terje Kanstad, Gro Markeset, Magdalena Jadwiga Osmolska, Max A.N. Hendriks |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Chloride induced corrosion
0211 other engineering and technologies Half-cell potentials 020101 civil engineering 02 engineering and technology Chloride concentrations Half cell potentials lcsh:Technology Chloride Bridge (nautical) 0201 civil engineering Corrosion Girder 021105 building & construction medicine Chloride-induced corrosion General Materials Science Corrosion assessment Corrosion assessments Concrete cover Civil and Structural Engineering Inspections lcsh:T business.industry Inspection Electrical resistivity Building and Construction Structural engineering Geotechnical Engineering and Engineering Geology Computer Science Applications Visual inspection Cracking Environmental science Pretensioned girders business medicine.drug |
| Zdroj: | Infrastructures Infrastructures, 5(9) Volume 5 Issue 9 Infrastructures, Vol 5, Iss 76, p 76 (2020) |
| ISSN: | 2412-3811 |
| Popis: | The most common methods for detecting chloride-induced corrosion in concrete bridges are half-cell potential (HCP) mapping, electrical resistivity (ER) measurements, and chloride concentration testing, combined with visual inspection and cover measurements. However, studies on corrosion detection in pretensioned structures are rare. To investigate the applicability and accuracy of the above methods for corrosion detection in pretensioned bridge girders, we measured pretensioned I-shaped girders exposed to the Norwegian coastal climate for 33 years. We found that, even combined, the above methods can only reliably identify general areas with various probabilities of corrosion. Despite severe concrete cracking and high chloride content, only small corrosion spots were found in strands. Because HCP cannot distinguish corrosion probability in the closely spaced strands from other electrically connected bars, the actual condition of individual strands can be found only when concrete cover is locally removed. Wet concrete with high chloride content and accordingly low HCP and low ER was found only in or near the girder support zones, which can therefore be considered the areas most susceptible to chloride-induced corrosion. We conclude by proposing a procedure for the inspection and assessment of pretensioned girders in a marine environment. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited |
| Databáze: | OpenAIRE |
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