Effects of alternating immersion and freezing&thawing on evaluation of dirt streaks from flowing on external materials

Abstract

There are many previous researches on dirt stuck to building materials. However, it is not clear the influences of building materials are deteriorated on the dirt.In this study, it was conducted the experimental studies on the influences of alternating immersion and which washable-property concerning dirt streaks from flowing on various external materials affected by freezing & thawing test on the dirt stuck to various external materials. And, it was also conducted sensory tests to evaluate the dirt by sense of human. The results show that the brightness of the building materials are not changed after deterioration tests, however, the deteriorated materials become difficult to remove the dirt.