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Title |
Analysis Technique for Chloride Penetration using Double-layer and Time-Dependent Chloride Diffusion in Concrete
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Authors |
문진만(Jin-Man Mun) ; 김진영(Jin-Yeong Kim) ; 김영준(Young-Joon Kim) ; 오경석(Gyeong-Seok Oh) ; 권성준(Seung-Jun Kwon) |
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DOI |
http://dx.doi.org/10.11112/jksmi.2015.19.5.083 |
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Keywords |
이중구조 ; 겉보기염화물 확산계수 ; 시간의존성 확산 ; 표면함침 ; 표면염화물 Double layer ; Apparent diffusion coefficient ; Time-dependent diffusion ; Surface impregnation ; Surface chloride contents |
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Abstract |
With varying conditions of concrete surface, induced chloride contents are changed and this is a key parameter for steel corrosion and service life in RC (Reinforced Concrete) structures. Many surface enhancement techniques using impregnation have been developed, however the evaluation techniques for chloride behavior through doubly layered media and time-dependent diffusion are rarely proposed. This paper presents an analysis technique considering double-layer concrete and time-dependent diffusion behavior, and the results are compared with those from the previous test results through reverse analysis. The chloride profiles from the surface-impregnated concrete exposed to atmospheric, tidal, submerged zone for 2 years are adopted. Furthermore surface chloride contents and diffusion coefficients are obtained, and are compared with those from Life365. Through consideration of time effect, the relative error decreases from 0.28 to 0.20 in atmospheric, 0.29 to 0.11 in tidal, and 0.54 to 0.40 in submerged zone, respectively, which shows more reasonable results. Utilizing the diffusion coefficients from Life365, relative errors increases and it needs deeper penetration depth (?) and lower diffusion coefficient ratio () due to higher diffusion coefficient.
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