Protective Ability Index of Rust Layer Formed on Weathering Steel Bridge

S. Hara; T. Kamimura; H. Miyuki; M. Yamashita; H. Uchida

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자료유형: 학술저널

저자정보: S. Hara T. Kamimura H. Miyuki M. Yamashita H. Uchida

저널정보: 한국부식방식학회 Corrosion Science and Technology Corrosion Science and Technology 제6권 제3호

발행연도: 2007.1

수록면: 128 - 132 (5page)

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For a quantitative inspection on the performance of weathering steel bridges, we have investigated the relationship between the corrosion rate and the composition of the rust layers formed on weathering steel bridges located in various environments in Japan and applied a protective ability index (PAI) to the bridges. The corrosion rates were clearly classified by the PAI, α/γ* and sub index of (β+s)/γ*, where α, γ*, β and s are the mass ratio of crystalline α-FeOOH, the total of γ-FeOOH+ β-FeOOH + the spinel-type iron oxide (mainly Fe3O4), β-FeOOH and spinel-type iron oxide, analyzed by powder X-ray diffraction, respectively. In the case of α/γ*>1, the rust layer works protective enough to reduce the corrosion rate less than 0.01 mm/y. The sub index (β+s)/γ*<0.5 or >0.5 classifies the corrosion rate of the non-protective rust layers, therefore the former state of the rust layer terms inactive and the latter terms active. The quantitative inspection of a weathering steel bridge requires a performance-inspection (PI) and periodical deterioration- inspections (DI). The PI can be completed by checking of the PAI, α/γ*. The DI on the weathering steel bridges where deicing salt is sprinkled can be performed by checking the PAI, (β+s)/γ*.

#low alloy steel #weathering steel #atmospheric corrosion #X-ray diffraction #rust #protective ability index #deicing salt #chloride #bridge inspection.

참고문헌 (7)

참고문헌 신청

/ 1993 / and Japan Association of Steel Bridge Construction Cooperative Research Report on The Application of Weathering Steels to Bridges

/ 1994 / Journals of structural mechanics and earthquake engineering Japan Society of Civil Engineers

/ 1995 / Proceedings of JSCE Materials and Environments C-306 : 341 ~

/ 1999 / U.S. Department of Transportation

/ 2001 / Design manual for roads and bridges 2

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