Abstract
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.
| Original language | English |
|---|---|
| Journal | Cement and Concrete Research |
| Volume | 38 |
| Issue number | 1 |
| Pages (from-to) | 77-88 |
| ISSN | 0008-8846 |
| DOIs | |
| Publication status | Published - 2008 |
Keywords
- diffusion
- analytical solution
- Poisson-Nernst-Planck
- numerical analysis
- chloride
- migration test
- cement
- PNP
- electro-diffusion