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Study on Intelligent Compensation Technology of Guard Ring Method in Concrete Rebar Corrosion Monitoring Instrument

Author: XuLiNing
Tutor: DongZeHua
School: Huazhong University of Science and Technology
Course: Applied Chemistry
Keywords: Retaining ring method Corrosion Monitoring Compensation coefficient Influencing factors
CLC: TP277
Type: Master's thesis
Year: 2007
Downloads: 51
Quote: 0
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Abstract


Health monitoring of concrete is currently a very important area of ??research, therefore reinforced corrosion monitoring has become an important engineering problem. Current corrosion monitoring in ordinary three-electrode system, generally smaller size of the auxiliary electrode (CE), the electrical signals in the steel surface is not uniformly distributed, polarized area of ??uncertainty, and an electrical signal is weakened with the increase in the CE distance and even disappear. Uncertain problems for concrete structures polarized area, we use a guard ring electrode (Guard Ring Electrode, GE) measurement method, by the outside of the original small size of the auxiliary electrode (CE) to increase a same material as the ring-type auxiliary electrode (GE) to compensate for the dispersion of the polarization current, to limit the CE electrode positive projection surface. Actual polarization process, the electric power line in the concrete is unevenly distributed, resulting in the degree of compensation of the internal concrete uncertain, especially under different etching conditions, with the same degree of compensation, and the same polarization area is impractical. To explore appropriate compensation coefficient, the papers in a different season climate, different corrosion systems by changing the reference electrode in the depth of concrete, the proportion of the GE current compensation retaining ring electrode were detailed study corrosion in order to obtain a more accurate quantitative information. Specifically, this paper mainly completed the following aspects: First, this paper has done a detailed study of the impact of external environment conditions on the rate of corrosion of concrete, the results show that: the external environment conditions on concrete corrosion state impact, with the summer to the winter climate conversion, concrete resistance R c is growing, increasing activation state reinforced concrete / steel polarization resistance R p i corr , the corrosion rate falling sharply, but stable passivation state of reinforcement corrosion. Secondly, on the basis of the different seasonal climate polarization potential resistance of concrete and reinforced corrosion rate of the retaining ring (GRM) appropriate compensation coefficient test done a series of experiments, the results show that the compensation coefficient λ with the the concrete resistance R c and rebar corrosion rate between certain relations. Finally, on the basis of the above theoretical and experimental analysis, the use of the compensation coefficient the λ the concrete resistance R c and the corrosion potential E o cp linear relationship to determine a empirical formula and developed based on this portable intelligent corrosion monitoring instrumentation, tests showed that: the measurement accuracy is increased by 2 to 3 times more than similar foreign products.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation systems > Monitoring, alarm,fault diagnosis system
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