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Prediction of Deterioration Process for Concrete Considering Combined Deterioration of Carbonation and Chlorides Ion
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Prediction of Deterioration Process for Concrete Considering Combined Deterioration of Carbonation and Chlorides Ion
Lee, Chang-Soo; Yoon, In-Seok;
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The most common deteriorating processes of concrete structures are carbonation and chloride ion ingress. Many concrete structures have been suffered from chloride ions diffusion or carbonation induced reinforcement corrosion damage and many studies have been done on it. However, those studies were confined mostly to the single deterioration of carbonation or chloride attack only, although actual environment is rather of combined conditions. In case of many in-situ concrete structures, deterioration happened more for the case of combined attack than the single case of carbonation or chloride attack. In this paper, chloride profiles of carbonated concrete is predicted by considering two layer composite model, which is based on Fick's 2nd law. From the experimental result on combined deterioration of chloride and carbonation, it was examined that high chloride concentration was built up to 3∼5 mm over depth from carbonation depth. The analytical modeling of chloride diffusion was suggested to depict the relative influence of the carbonation depth. The diffusion coefficients of carbonation concrete and uncarbonated concrete with elapsed time were considered in this modeling.
chloride ion;carbonation;combined deterioration;service life prediction;Fick s 2nd law;
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