Maintenance Scenario of Concrete Structures Damaged by Reinforcement Corrosion Based on Corrosion Propagation Mechanism of Steel and Moisture Behavior in Concrete

It can be said that corrosion of reinforcing steel is a serious problem for concrete structures. However, the corrosion mechanism of steel is still unclear, and it is difficult to prevent corrosion perfectly. In this study, in order to make clear the corrosion process in alkaline environment, the co...

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Bibliographic Details
Published in:Journal of Advanced Concrete Technology 2021/06/23, Vol.19(6), pp.614-629
Main Authors: Takaya, Satoshi, Saito, Ryosuke, Satoh, Shinichi, Yamamoto, Takashi
Format: Article
Language:English
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Summary:It can be said that corrosion of reinforcing steel is a serious problem for concrete structures. However, the corrosion mechanism of steel is still unclear, and it is difficult to prevent corrosion perfectly. In this study, in order to make clear the corrosion process in alkaline environment, the corrosion products formed in solutions of various OH- and Cl- concentrations were evaluated by Raman spectroscopy. In addition, the influence of dissolved oxygen on corrosion products was investigated. Furthermore, the corrosion mechanism of steel in concrete was investigated based on field study. These investigations made it clear that the behavior of moisture in concrete has large influence on corrosion propagation. Therefore, the influence of W/C, chloride ions and cracks on the behavior of moisture in concrete was also investigated. Based on the the results obtained, the authors propose a maintenance scenario for concrete structures damaged by corrosion of the reinforcement.
ISSN:1346-8014
1347-3913
DOI:10.3151/jact.19.614