Modeling of Ionic Diffusivity for Cement Paste with Solid Mass Fractal Model and Lattice Boltzmann Method

Ionic diffusivity is of critical importance to the service life of cementitious composites. In this paper, ionic diffusivity of cement paste is modeled with the solid mass fractal model and the lattice Boltzmann method. In particular, the solid mass fractal model is proposed and applied to build up pore structure in conjunction with the porosimetric test. Thereafter, the lattice Boltzmann method is applied to model the associated ionic diffusivity with respect to the law of ionic diffusion for both saturated and unsaturated cement pastes. In addition, for the sake of validation, the results of the present modeling are compared with those obtained from literature and experiment. (C) 2016 American Society of Civil Engineers.