The heavy-duty coating has been applied to the steel members of the Honshu-Shikoku Bridges. The preventive maintenance for coating, which is timely repainted only surface coat and middle coat, was adopted, and the deterioration prediction of paint film was conducted to decide the repainting period. As a result of outdoor weathering test, it was found that the weather resistance performance of paint film is higher than that of previous repainting plan, and the high accuracy deterioration prediction method was required in order to judge a timing of the starting for repainting.
In this paper, the development of the deterioration prediction method for heavy-duty coating considering the dispersion of the reduction rate of thickness and the remaining thickness of paint film is described.
