Numerical calculations of the effect of moisture content and moisture flow on ionic multi-species diffusion in the pore solution of porous materials

A method to analyse and calculate concentration profiles of different types of ions in the pore solution of porous materials such as concrete subjected to external wetting and drying is described. The equations in use have a solid theoretical meaning and are derived from a porous media technique, which is a special branch of the more general mixture theory. The effect of chemical action is ignored, making the presented model suitable to be implemented into codes dealing solely with chemical equilibrium.