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Journal article

Application of the Poisson-Nernst-Planck equations to the migration test

By Krabbenhøft, Kristian1,2; Krabbenhøft, Jørgen2,3

From

Section for Geotechnics and Geology, Department of Civil Engineering, Technical University of Denmark1

Department of Civil Engineering, Technical University of Denmark2

Section for Structural Engineering, Department of Civil Engineering, Technical University of Denmark3

The Poisson-Nernst-Planck (PNP) equations are applied to model the migration test. A detailed analysis of the equations is presented and the effects of a number of common, simplifying assumptions are quantified. In addition, closed-form solutions for the effective chloride diffusivity based on the full PNP equations are derived, a number of experiments are analyzed in detail, and a new, truly accelerated migration test is proposed.

Finally, we present a finite element procedure for numerical solution of the PNP equations.

Language: English
Year: 2008
Pages: 77-88
ISSN: 18733948 and 00088846
Types: Journal article
DOI: 10.1016/j.cemconres.2007.08.006
Keywords

PNP Poisson-Nernst-Planck analytical solution cement chloride diffusion electro-diffusion migration test numerical analysis

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