Ryuichi Sakai
Study on the quantity of rust and corrosion environment of the bridge in which airborne salt come from oblique direction.
Eiji Iwasaki
In the near future a lot of bridges in Japan are aging. Thus we must update the bridge. If we replace bridges it is important reduction of LCC for bridge. The LCC is life cycle cost of the bridge. Unpainted weathering steel bridge that can reduce the LCC will occur local corrosion on rare occasions. Airborne salt can be mentioned as one of the factors that cause local corrosion. Adopted standard of weathering steel bridges is that the amount of airborne salt of annual average is less than 0.05mdd. However, this standard does not considered the localized corrosion.
Then, in the present study the quantity of rust and corrosion environment of bridge which distinguished direction of wind containing airborne salt is difference in bridge axis are investigated. And, the purpose of this study is to clarify the relationship between the quantity of rust and corrosive environment, and the differences between each part of the quantity of rust and corrosive environment.
The result of investigation for a year, it is found that the average annual amount of airborne salt differ between the right bank and left bank side of the bridge. And It was found that the amount of airborne salt has changed in constant ratio at each part, during winter that a large amount of airborne salt comes. By this, in case of a general bridge that airborne salt is blowing from an oblique direction of bridge axis, if knowing the amount of airborne salt in a part, it is considered to be possible that amounts of airborne salt in each part can understand in general by giving the part coefficient.
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