Corrosion risk assessment of chloride-contaminated concrete structures using embeddable multi-cell sensor system |
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Authors: | LU Shuang BA Heng-jing |
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Affiliation: | (1) Department of Civil Engineering, Gaziantep University, Gaziantep, 27310, Turkey |
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Abstract: | Monitoring the service condition of concrete structures requires the quantitative assessment of properties and corrosion rate
of structural steels surrounded by concrete. A multi-cell sensor system that included a reference electrode, a chloride content
sensor, a macrocell current unit and an electrical resistance measurement unit was developed. This system provided the following
important electrochemical data in the cover-zone concrete on site: open circuit potential, macrocell current from anodes to
cathode, chloride profile, concrete resistance and corrosion rate of built-in anodes. The experimental results show that the
macrocell current increases when the chloride content in concrete is higher. Thus, monitoring the chloride content is a good
method for monitoring the corrosion state. The chloride ion content and cover depth are the key factors that affect the electrical
resistance of concrete. Without considering the temperature and time, a simplified model of the instantaneous corrosion rate
of steel rebar in a concrete structure based on the measured chloride contents and concrete resistance was proposed. The test
results further prove the reliability of this simplified predicting model. |
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Keywords: | concrete structures corrosion rate resistance chloride content macrocell current multi-cell sensor |
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