The single-valued diffusion coefficient for ionic diffusion through porous media

被引：0
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作者：
Lorente, Sylvie [1 ]
Voinitchi, Dorinel [1 ,3 ]
B´gú-Escaffit, Pascale [1 ]
Bourbon, Xavier [2 ]
机构：
[1] Laboratory Materials and Durability of Constructions, Department of Civil Engineering, Institut National des Sciences Appliqúes, 135 Avenue de Rangueil, 31077 Toulouse, France
[2] Agence Nationale pour la Gestion des D̀�chets Radioactifs, 1 rue Jean Monnet, 92290 Châtenay Malabry, France
[3] Technical University of Civil Engineering, Bd. Lacul Tei No. 124, Sector 2, Bucharest, Romania
来源：
Journal of Applied Physics | 2007年 / 101卷 / 02期
关键词：
The current literature on ionic diffusion through porous media teaches that the diffusion coefficient is a complicated function depending on concentration; concentration gradient; and electrical potential gradient. This paper documents how natural diffusion tests and migration tests (electrically enhanced transport) lead to the measurement of a unique diffusion coefficient for a given ionic species and a given material. Natural diffusion tests for chloride and a ceramic of Ti O2 were implemented at two different concentration levels. The experiments were designed to emphasize the impact of the membrane potential in the pore solution on the chloride flux. By accounting for the membrane potential it is shown that the chloride diffusion coefficient is unique for a given material. An iterative method based on a numerical model solving the continuity equations and the current law is proposed to determine the diffusion coefficient. The approach is applied with success to published results on a cement-based material. Migration tests were also performed with chloride in a cementitious material; where the chloride transport is enhanced by an external electrical field. The experimental results reveal the competition between diffusion and electrical effects in the case of noncontaminated porous materials. By varying the electrical potential difference it is shown that the flux of chloride varies linearly with the electrical field; meaning that the chloride diffusion coefficient does not depend on the electrical field. The main conclusion is that there is only one chloride diffusion coefficient for a given porous material. © 2007 American Institute of Physics;
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