Akira Yuasa
Research on steel bridge corrosion spreading deicing salt
Eiji Iwasaki
Sprinkling of antifreezing agent is a technique that is most generally conducted now as surface frozen countermeasure in winter that is accompanied in used prohibition of to use a studded tire.
Corrosion damage of a steel structure object of a bridge etc by deicing salt is confirmed in snowy cold district.
So far there is a case that investigated influence to vegetation and a roadside environment by deicing salt, but a case that spreaded deicing salt investigated adheres situation to a girder systematic is a few.
Accordingly, a direction that wind blows and a wind velocity, quantity of a spreading of deicing salt, quantity of adhesion to steel girder, corrosion quantity of exposure test piece intending for plural bridges to obtain knowledge with regard to corrosion by a spreading of deicing salt.
To examine relation of a spreading to a girder and corrosion of a steel bridge of deicing salt that surface upside of bridge was sprinkled, it investigated for Joshinetsu Expressway of Matsudai district in Nagano Prefecture Nagano City Nagano IC vicinity that thinks that salt does not coming flying and a bridge of prefectural highway 385 issue line upside that is located about 46m concurrently apart to the upstream side bridge.
The obtained results in this study is as follows.
There is very much quantity that scatters to girder exterior in comparison with girder inside. in the bridge that deicing salt is sprinkled on surface upside.
A degree that deicing salt separates from a bridge that is sprinkled, spreading quantity to plural bridges that stood in a line does damping.
A high correlation was seen in a square average wind velocity and spreading quantity under the girder of an each bridge.
There is relation of y=axb in spreading quantity and corrosion depletion quantity in the bridge that deicing salt is sprinkled on surface upside.
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