Evaluation of moisture migration of surface treated concrete member under accelerated weathering condition

Abstract

Surface-impregnation materials and coating agents would be effective in maintaining the authenticity of historical reinforced concrete buildings. This study investigates the effect of the surface-impregnation materials and coating agents in preventing the water vapor and gas ingress into concrete. The following results were obtained: (1) The surface-impregnation materials did not have the prevention of water vapor, however the type of silicate prevent the progress of carbonation by water sprinkling. (2) The surface-coating agents have a significant effect on the prevention of water vapor by pilling up in layers. (3) A good agreement was found between air permeability and carbonation progress at field research; It shows air permeability might be a good index to evaluate the decrease of preventive effect to deterioration of coating.