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.

可以说，钢筋锈蚀是混凝土结构的一个严重问题。然而，钢的腐蚀机理尚不清楚，很难完美地防止腐蚀。本研究为了弄清碱性环境下的腐蚀过程，在各种OH ^-和Cl ^-溶液中形成的腐蚀产物^。通过拉曼光谱评估浓度。此外，还研究了溶解氧对腐蚀产物的影响。此外，在现场研究的基础上，研究了钢筋在混凝土中的腐蚀机理。这些调查清楚地表明，混凝土中水分的行为对腐蚀传播有很大影响。因此，还研究了 W/C、氯离子和裂缝对混凝土中水分行为的影响。基于获得的结果，作者提出了一种因钢筋腐蚀而损坏的混凝土结构的维护方案。