Effective and Apparent Diffusion Coefficients of Chloride Ions and Chloride Binding Kinetics Parameters in Mortars: Non-Stationary Diffusion-Reaction Model and the Inverse Problem.

摘要: A non-equilibrium diffusion–reaction model is proposed to describe chloride transport and binding in cementitious materials. numerical solution for this non-linear with reaction problem obtained using the finite element method. The effective diffusion coefficients parameters of are determined inverse method based on a experimentally measured concentrations. investigations performed two significantly different cements: ordinary Portland blast furnace cements. results compared classical appropriate apparent coefficients. role binding, respect isotherms applied, overall chlorides discussed, along applicability models. work allows determination important that influence longevity concrete structures. developed methodology can be extended include more ions, electrostatic interactions, activity even accurate estimation longevity.