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Experimental Study on Chloride Penetration into Concrete under Combined Exposure Conditions of Chlorides and High Concentrated Sulfates
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 Title & Authors
Experimental Study on Chloride Penetration into Concrete under Combined Exposure Conditions of Chlorides and High Concentrated Sulfates
Oh, Byung-Hwan; Jung, Sang-Hwa; Jiang, Yi-Rong; Kim, Jee-Sang;
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Recently, the durability of concrete structures has received great attention as the number of sea-side structures, such as new airport, bridges, and nuclear power plants, increases continuously. In this regards, many studies have been done on the chloride attack in concrete structures. However, those studies were confined mostly to the single deterioration due to chloride only, although actual environment is rather of combined type. The purpose of the present study is, therefore, to explore the effects of combined deterioration due to chlorides and sulfates in concrete structures. To this end, comprehensive experimental program has been set up to observe the chloride penetration behavior for various test series. The test results indicate that the chloride penetration is more pronounced for the case of combined attack than the case of single chloride attack. The surface chloride content is found to increase with time and the diffusion coefficient for chloride is found to decrease with time. The prediction equations for surface chloride content and diffusion coefficient were proposed according to test results. The equations for chloride penetration considering the time-dependent diffusion coefficients and surface chlorides were also suggested. The present study allows more realistic assessment of durability for such concrete structures which are subjected to combined attacks of chlorides and high concentration sulfates but the future studies for combined environment will assure the precise assessment.
chloride ion;sulfate ion;diffusion coefficient;chloride penetration;
 Cited by
염해를 받는 콘크리트 구조물의 확률론적 내구성 해석,김지상;정상화;김주형;이광명;배수호;

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