A multi-species reactive transport model based on ion-solid phase interaction for saturated cement-based materials

This study established a reactive transport model (RTM) for saturated cement-based materials based on multi-ionic through an uncharged, ‘free water’ and charged, ‘the electrical double layer’ coupled with chemical equilibrium interaction between pore solution solid phase. A set of modified Poisson-Nernst-Planck equations, including the effect temperature, property, structure changes, have been introduced transport. comprehensive method has illustrated determining diffusion coefficient at infinite dilution aqueous species present in cementitious material. Numerical predictions were compared to experimental data demonstrate applicability RTM. For mortar specimens exposed NaCl seawater, numerical agree well experimentally determined Portlandite carbonate phase assemblage, elemental distribution such as chloride, sodium, potassium, magnesium, sulfur adjusting initial tortuosity factor.