ADHESION CHARACTERISTICS OF ANTI-FREEZING SALT TO THE BRIDGE GIRDERS SCATTERED FROM ITS ROAD SURFACE WITHOUT SURROUNDING OBSTACLES

Abstract

 Anti-freezing salt is a factor of corrosion like airborne sea salt, but it has not been studied sufficiently if anti-freezing salt scattered from the road surface of a bridge without surrounding obstacles may adhere to its girders. This paper investigates the characteristics of the behavior in the atmosphere and adhesion to the bridge girders of anti-freezing salt particles using computational fluid dynamics. It was clarified that anti-freezing salt may adhere to the bridge girders without surrounding obstacles because of airflows formed by the interaction between the approaching flow and the bridge itself, depending on the approaching wind speed and size of a salt particle. The combination of a vertical plate installed to the upstream bridge railing and a horizontal one the downstream changed airflows around the bridge to reduce the adhesion amount of anti-freezing salt to the bridge girders very much.