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http://dx.doi.org/10.4334/JKCI.2003.15.2.173

Experimental Study on Chloride Penetration into Concrete under Combined Exposure Conditions of Chlorides and High Concentrated Sulfates  

Oh, Byung-Hwan (Dept. of Civil Engineering, Seoul National University)
Jung, Sang-Hwa (Dept. of Civil Engineering, Seoul National University)
Jiang, Yi-Rong (Dept. of Civil Engineering, Seoul National University)
Kim, Jee-Sang (Dept. of Civil Engineering, Seokyeong University)
Publication Information
Journal of the Korea Concrete Institute / v.15, no.2, 2003 , pp. 173-182 More about this Journal
Abstract
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.
Keywords
chloride ion; sulfate ion; diffusion coefficient; chloride penetration;
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