This paper treats the chloride ingress in concrete subject alternatively to de-icing salts and atmospheric carbonation through a reactive transport model. The general framework of reactive transport model is reviewed for its treatment of the carbonation reactions, the CO 2 and ionic transport and the dissolution equilibrium between solid and liquid phases. Then the model is applied to typical frost climates with application of de-icing salts and the environment conditions are idealized as yearly-based cycles having evenly distributed rainy and snowy events with drying periods in between. Comprehensive parametric study is performed on the impact of climate parameters and concrete properties, and obtains the following observations: (1) the determinant climate factor for chloride ingress is the intensity of de-icing salts application and relative humidity of drying periods plays a secondary role; (2) considering carbonation is to globally limit the chloride ingress mainly due to the decrease of chloride diffusivity by pore filling after concrete carbonation; (3) the moisture boundary conditions on concrete surface should take into account the wetting by rainy events otherwise the surface washing of chlorides will be omitted.