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| Solve Chloride Ions Diffusion Problem by Separation Variable Method for Reinforced Concrete Slab in Marine Environment |
YUE Zhuwen( ), LI Jingpei, YANG Bo, SHAO Wei, LV Tao |
| Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China |
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Abstract Concrete slab as a part of marine engineering structure should surly be suffered from chloride ions corrosion. The relevant chloride ions diffusion problem in a concrete slab immersed in seawater was solved by means of separation variable method in this paper. In comparison with the solutions obtained by error function and numerical calculation methods, we proved this generalized solution was the correct answer for the bilateral chloride ion diffusion in a concrete slab. According to calculation and analysis, we found that the bilateral diffusion would cause greater harm than one side diffusion, but concentration superposition would not occur; chloride ion diffusion rate would speed up when concentration gradient increase caused by the increasing chloride ion concentration at one side surface. A mutation of chloride ion concentration gradient might occur where diffusion coefficient changed, but the chloride ion concentration distribution kept continuous.
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Received: 18 July 2013
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