At the same testing temperature,the deviations for repeated rapid permeation testing results of the same specimen keep less than 5%.Accordingly,it is derived that effect of surface treatment on chloride diffusion in concrete can be analyzed using comparative rapid permeation tests of concrete specimens before and after surface treatment with the same specimen.Diffusivity of saturated concretes surface-treated without and with epoxy resin was studied by rapid permeation test,while capillary absorption of non-saturated concrete specimens during wetting was determined by water absorption test.Effect of epoxy resin on diffusivity and capillary absorption has been compared with those of organo-silicone,polymer-cement-based waterproof coating or combination of two or three above materials.For saturated concrete,epoxy resin can reduce dramatically the diffusivity of chloride ions,with better effect than organo-silicone and waterproof coating.Capillary absorption and its induced chloride ion transport of non-saturated concrete during wetting are also decreased after surface-treatment with epoxy silicone,slightly higher than those with organo-silicone and significantlysly lower than those treated with waterproof coating.