Study on silane impregnation for protection of high performance concrete

Abstract

Steel corrosion caused by chloride penetration is the main reason for the damage of concrete structures in marine environment. By silane impregnation, the corrosion of chloride on concrete can be inhibited effectively, and the water absorption of concrete can also be decreased. Silane gel and silane solution was used as protection treatment on concrete surface respectively. Effect of silane type and painting amount of silane on the mechanical performance, capillary water absorption and chloride ion permeability of concrete was studied in the present investigation. The experimental results showed that the two silanes can penetrate to the depth of about 2∼6mm. Compared with untreated samples, the reduction of water absorption and chloride absorption of treated concrete was higher than 90%. The chloride diffusion coefficient and electric flux decreased obviously. The protection effect of silanes on concrete both improves with the increase of painting amount. The protection of silane gel on concrete was better than that of silane solution.