Author(s): T. Takeuchi; S. Kioka
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Abstract: In the sea of Okhotsk, damage to coastal structures and training levees comprised of steel sheet pile-type seawalls has been reported (Kioka and Takeuchi, 2012a). This damage is related to wear, abrasion, deformation and so on of steel sheet piles influenced by the action of sea ice. If rust layers due to corrosion of steel surfaces in ice-free sea are removed by the action of sea ice in winter, the amount of corrosion will increase further during ice-free periods (from April to January, in the sea of Okhotsk, facing Hokkaido). Consequently, this process of corrosive wear leads to greater wear of steel structures in ice-infested sea compared to that in ice-free sea. Sea ice always moves continuously up and down with the tide. A sliding wear test in a lowtemperature chamber was carried out to examine the conditions of removing rust layers using a corroded steel specimen with rust layers in contact with saline ice. The contact pressure and amount of sand at the interface were taken as parameters here to determine corrosive wear in iceinfested sea. Since the conditions in which rust layers are removed are normal in the field, greater wear of steel in ice-infested sea compared to ice-free sea must be considered in the design of steel structures. Also, it is possible to predict the deterioration of steel in ice-infested sea using the relationship between the amount of corroded steel and elapsed years.
Year: 2014