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Research on Electrochemical Rehabilitation Methods for Reinforced Concrete Structures

Author: ZhuPeng
Tutor: QuWenJun
School: Tongji University
Course: Structural Engineering
Keywords: Electrochemical remediation technology Desalination Chloride ion extraction Realkalisation technology Durability
CLC: TU746.3
Type: Master's thesis
Year: 2006
Downloads: 201
Quote: 6
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Abstract


Realkalisation Applied Electrochemistry and electroosmosis principle, in the concrete reinforcement and concrete perimeter sodium carbonate electrolyte between an electric field is applied, in the role of a DC, the electrochemical reaction occurs to produce hydroxide ions at the cathode reinforced carbonate sodium electrolyte to penetrate the reinforced concrete around the restoration of reinforced concrete around the high PH value, to the purpose of preventing corrosion of steel bars. This article first erosion of chloride ions on the concrete. Chloride diffusion test method development and comparison of different test methods, the analysis of the advantages and disadvantages of the different test methods. At the same time, the chloride diffusion theory. Variety of chloride ion diffusion theory model, showing its theoretical system of continuous improvement, gradually consider different chloride ion diffusion factors in the theoretical model. On this basis, the analysis of the mechanism of the desalting technology, the operation steps, advantages and side effects. Secondly, to embark on a comprehensive analysis of of realkalisation technologies. ① research mechanism for realkalisation, at home and abroad have a different perspective, the comparative study are several views of the existing mechanism of realkalisation comprehensive, in-depth analysis to clarify doubt. ② to summarize different realkalisation technology experimental methods, will be classified into three categories, and a comparative analysis; take into account re-the alkalization technology experimental study using technical means not being familiar with the text introduced to analyze the more accurate reference to the use of experimental techniques for the study. ③ analysis of controlled studies research ideas, analysis of the progress of their research to reveal the inadequacies of which, and recommended better control theory. The ④ analysis realkalisation technical effectiveness, safety and other issues. For Finally, durability of realkalisation technology research, found realkalisation reverse diffusion of concrete sodium carbonate (the common realkalisation electrolyte composition) have a great impact on the durability and this study . Analysis of reasonably simplified derivation of Fick's second law and the development of theoretical models to establish the concentration of sodium carbonate, sodium carbonate changes the realkalisation concrete use this formula to calculate the sodium carbonate diffusion process. This theoretical formula combined theoretical and experimental research to further get the durability of realkalisation theories and other related theories, these theories can predict realkalisation durable life, calculated the best realkalisation thickness and the sodium carbonate electrolyte concentration, etc., to solve the re-alkali important issues in the study of technology. And an illustrative example is the use of these theories. In addition, design of experiments, in accordance with the design of this experiment to experiment, experimental results with the text to establish the theoretical calculation results of a comparative study, and thus can improve and perfect each theory.

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