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Computers and Concrete Volume 13, Number 2, February 2014 , pages 149-171 DOI: https://doi.org/10.12989/cac.2014.13.2.149 |
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Temperature effect on multi-ionic species diffusion in saturated concrete |
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Nattapong Damrongwiriyanupap, Linyuan Li, Suchart Limkatanyu and Yunping Xi
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| Abstract | ||
| This study presents the mathematical model for predicting chloride penetration into saturated concrete under non-isothermal condition. The model considers not only diffusion mechanism but also migration process of chloride ions and other chemical species in concrete pore solution such as sodium, potassium, and hydroxyl ions. The coupled multi-ionic transport in concrete is described by the Nernst-Planck equation associated with electro-neutrality condition. The coupling parameter taken into account the effect of temperature on ion diffusion obtained from available test data is proposed and explicitly incorporated in the governing equations. The coupled transport equations are solved using the finite element method. The numerical results are validated with available experimental data and the comparison shows a good agreement. | ||
| Key Words | ||
| chloride; concrete; temperature effect; Nernst-Planck equation; ionic diffusion | ||
| Address | ||
| Nattapong Damrongwiriyanupap: Civil Engineering Program, School of Engineering, University of Phayao, Phayao 56000, Thailand Linyuan Li: Department of Mathematics and Statistics, University of New Hampshire, Durham, NH 03824, United States Suchart Limkatanyu: Department of Civil Engineering, Faculty of Engineering, Prince of Songkla University, Songkla 90112, Thailand Yunping Xi: Department of Civil, Environmental, and Architectural Engineering, University of Colorado at Boulder, Boulder, CO 80309, United States | ||