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Title |
Chloride Diffusion Coefficients in Cold Joint Concrete with GGBFS
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Authors |
오경석(Kyeong-Seok Oh) ; 문진만(Jin-Man Mun) ; 권성준(Seung-Jun Kwon) |
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DOI |
http://dx.doi.org/10.11112/jksmi.2016.20.5.044 |
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Keywords |
Accelerated chloride diffusion coefficient ; Cold joint ; GGBFS ; OPC |
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Abstract |
Among the deteriorating agents, chloride ion is reported to be one of the most harmful ions due to its rapid diffusion and direct effect on steel corrosion. Cold joint which occurs in mass concrete placing is vulnerable to shear resistance and more severe deterioration. The paper presents an quantitative evaluation of chloride diffusion coefficient in OPC(Ordinary Portland Cement) and GGBFS(Ground Granulated Blast Furnace Slag) concrete containing cold joint. GGBFS concrete shows 6.6×10-12 m2/sec which is almost 30% level of OPC concrete results and the trend is repeated in the case of cold joint concrete. Compared with OPC concrete, GGBFS concrete is evaluated to have better resistance to chloride penetration, showing 0.30 times of chloride diffusion coefficient in concrete without cold joint 0.39 times with cold joint, respectively.
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