CORROSION DETERIORATION CHARACTERISTICS OF VARIOUS REPAINTED STEELS CONSIDERING ACCELERATED EXPOSURE TEST RESULTS

Abstract

This study performed an accelerated exposure test for 300 days to obtain the steel bridge repainting cycles quantitatively and examined corrosion characteristics of various repainted steel with differente surface preparations. Test specimens used in this study were cut out from the bridge girder used 36 years, and applied 3 types of surface preparation and 4 kinds of repainting systems. Each 3 specimens were taken out from the facility every 100 days, and evaluated the deterioration level by measuring brightness retention rate, blistering area and so on. By comparing the deterioration level of three types of surface preparation and 4 kinds of repainting systems, the repainting cycles of different paterns of spacimen were obtained.