STUDY ON CORRELATIVITY FOR PAINT FILM DETERIORATION OF STEEL BRIDGE WITH CORROSION UNDER PAINT FILMS

Abstract

As a method to determine the time to re-painting of steel bridges, the relation between the ratio of deterioration area observed on a paint film surface and the corrosion degree (corrosion density) of the steel occurred under its paint film was measured by using the image processing for 6 bridges with the different natural environments.
As a consequence of analyzing these data through a statistical technique, it was found that there was a significant correlationship between a ratio of deteriorated area of paint film surface and a deterioration degree under its paint film.
In addition, the corrosion degree under paint film would be presumed from the deterioration degree on the surface of the paint film by the regression fomula of our research.