Corrosive Environment Estimation in Girders for Weathering Steel Bridge by Exposure Tests Using Attachable Small Test Pieces

Abstract

Monitoring study for an existing bridge carried out to confirm the validity of the corrosive environment predictions before construction, by reason of that the weathering steel type and anticorrosion method for the target bridge were selected from the corrosive environment estimation before construction. This paper reports the corrosive environment monitoring results in girders for an existing weathering steel bridge by exposure tests, in a program designed for 1, 3 and 5 year exposure time periods, using attachable small test pieces. From the results of exposure tests, the validity of the corrosive environment predictions before construction is confirmed. However, it is found that the influence of structural form with bridge and climate change is large to evaluate the corrosion durability on weathering steel bridges over 100 years.