Abstract
For reconsideration of the corrosion protect at the interior of a steel box girder we reserch a corrosion environment of the interior of a steel box girder at Hakucho Bridge (at Hokkaido). This bridge i s composed of two box girders of which the interior as well as the exterior was not painted on the basis of the local design specifications. In one of the two box girders, a dehumidification plant was installed and has been operated for one and half year. We report about the experiment, and measurements of a temperature and a humidity, a working condition of the dehumidifier, an example of ACM corrosion sensor's output.
