Influence of Reinforcement Mesh Configuration for Improvement of Concrete Durability |
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| Authors: | PAN Chong-gen JIN Wei-liang MAO Jiang-hong ZHANG Hu SUN Li-hao and WEI Dong |
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| Institution: | Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China,Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China;Institute of Structural Engineering, Zhejiang University, Hangzhou 310058, China,Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China,Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China;Institute of Structural Engineering, Zhejiang University, Hangzhou 310058, China,Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China and Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China |
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| Abstract: | Steel bar in concrete structures under harsh environmental conditions, such as chlorine corrosion, seriously affects its service life. Bidirectional electromigration rehabilitation (BIEM) is a new method of repair technology for reinforced concrete structures in such chloride corrosion environments. By applying the BIEM, chloride ions can be removed from the concrete and the migrating corrosion inhibit can be moved to the steel surface. In conventional engineering, the concrete structure is often configured with a multi-layer steel mesh. However, the effect of the BIEM in such structures has not yet been investigated. In this paper, the relevant simulation test is carried out to study the migration law of chloride ions and the migrating corrosion inhibitor in a concrete specimen with complex steel mesh under different energizing modes. The results show that the efficiency of the BIEM increases 50% in both the monolayer steel mesh and the double-layer steel mesh. By using the single-sided BIEM, 87% of the chloride ions are removed from the steel surface. The different step modes can affect the chloride ion removal. The chloride ions within the range of the reinforcement protective cover are easier to be removed than those in the concrete between the two layers of steel mesh. However, the amount of migrating corrosion inhibitor is larger in the latter circumstances. |
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| Keywords: | bidirectional electromigration rehabilitation steel mesh chloride salt inhibitor |
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