Prediction of the relative permeability to gas flow of cement-based materials

摘要: Abstract The macroscopic physical modeling of coupled air and water transport in unsaturated porous material requires coefficients for the two phases along with diffusion coefficient vapor air. As their experimental determination is often difficult time consuming, relations have been proposed a long to allow calculation all needed parameters, starting from properties that are easier obtain, such as pressure head function degree saturation or isothermal sorption curves. These relations, validated soils, also used cement, mortars concrete, although they not really justified these cases. aim this study determine if soil physics principles can be applied moisture movement concrete. We measured permeability concrete specimens which we obtained relative permeability. Evidently, parameters introduced given by Van Genuchten [Ann. Geophys. 3 (1985) 615] revised. New values studied. good reproduction airflow evolution observed during experiments.