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Title |
Quantifying Chloride Ingress in Cracked Concrete Using Image Processing
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Authors |
김건수(Kun-Soo) ; 박기태(Kim) ; 김재환(Ki-Tae Park) |
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DOI |
https://doi.org/10.11112/jksmi.2022.26.4.57 |
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Keywords |
콘크리트; 염화물 침투; 미세균열; 이미지 분석 Concrete; Chloride ingress; Micro-crack; Image analysis |
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Abstract |
Chloride, which is one of the main deterioration factors in reinforced concrete structures, can degrade the performance of the structure due to chloride-induced corrosion of steel. Chloride content at steel depth or the rate of chloride penetration is necessary to determine deterioration of reinforced concrete or to calculate initiation time of steel corrosion caused by chloride attack. Chlorides in concrete are generally identified with typical two methods including chloride profiling using potentiometric titration method and discoloration method using AgNO3 solution. The former is advantageous to estimate chloride penetration rate (diffusion coefficient in general) with measured chloride contents directly, but it is laborious. In the case of latter, while the result is obtained easily with the range of discoloration, the error may occur depending on workmanship when the depth of chloride ingress is measured. This study shows that chloride penetrated depth is evaluated with the results obtained from discoloration method through image analysis, thereby the error is minimized by workmanship. In addition, the effect of micro-crack in concrete is studied on chloride penetration. In conclusion, the depth of chloride penetration was quantified with image analysis and as it was confirmed that chlorides can rapidly penetrate through micro-cracks, caution is especially required for cracks in concrete structure.
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