Influence of Carbonation and Chemical Activity of Water on Coupled Moisture-Ion Transport in Cementitious Materials
The influence of the chemical activity effects on moisture transport in the presence of ions in cementitious materials is studied. Wetting-drying tests are carried out on various hardened concretes (sound and fully carbonated) with water. Moisture profiles are experimentally assessed by gamma-ray attenuation. A multispecies and multiphase numerical model, in which the Lin and Lee approach is applied to compute the chemical activity coefficients of water in presence of ions, is used to simulate the transport of ions and moisture. The drying kinetics is analyzed to assess the intrinsic permeability of the material by inverse analysis. Experimental profiles are compared to the simulations to illustrate the relevance of the modeling.
I. Bezverkhyy, S. Chevalier and O. Politano
X. M. Wang et al., "Influence of Carbonation and Chemical Activity of Water on Coupled Moisture-Ion Transport in Cementitious Materials", Defect and Diffusion Forum, Vols. 323-325, pp. 263-268, 2012