Chloride transfer in cement-based materials. Part 1. Theoretical basis and modelling
| Autor: | Abdelkarim Aït-Mokhtar, Khaled Bourbatache, Olivier Millet, Ouali Amiri |
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| Rok vydání: | 2012 |
| Předmět: |
Materials science
Ionic transfer Computational Mechanics Ionic bonding 02 engineering and technology Mechanics 021001 nanoscience & nanotechnology Geotechnical Engineering and Engineering Geology Microstructure Homogenization (chemistry) 020303 mechanical engineering & transports 0203 mechanical engineering Mechanics of Materials Forensic engineering General Materials Science Cementitious 0210 nano-technology Asymptotic expansion Porous medium Dimensionless quantity |
| Zdroj: | International Journal for Numerical and Analytical Methods in Geomechanics. 37:1614-1627 |
| ISSN: | 0363-9061 |
| Popis: | SUMMARY In this first part of the work, we develop macroscopic models for migration and diffusion–migration of ionic species in saturated porous media, based on periodic homogenization. The prior application is chloride transport in cementitious materials. The dimensional analysis of Nernst–Planck equation lets appear to dimensionless numbers characterizing the ionic transfer in the porous medium. Using experimental data obtained from electrodiffusion tests on cement-based materials (Part II), these dimensionless numbers are linked to the perturbation parameter ϵ. For a strong imposed electrical field, the asymptotic expansion of Nernst–Planck equation leads to a macroscopic model where the migration is predominant. For a weak imposed electrical field or in natural diffusion, we obtain a macroscopic model coupling diffusion and migration at the same order. In both models, the expression of the homogenized diffusion tensor is identical and only involves the geometric properties of the material microstructure. Copyright © 2012 John Wiley & Sons, Ltd. |
| Databáze: | OpenAIRE |
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