EXPERIMENTAL STUDY ON WEAR OF RUST LAYERS AT THE SURFACE OF STEEL STRUCTURE FOCUSED ON IMPACT ICE LOAD

Abstract

 Since rust layer at the surface of corroded steel is removed due to sea ice action in ice-infested sea, this phenomenon of corrosive wear subsequently leads to promotion of wear due to increase of corrosion. Damage to training levees made of steel-sheet-pile-type seawalls on the Sea of Okhotsk occurred earlier than expected, since larger wear rate of steel structure had not been considered in their design.In the paper, degradation mechanism of steel structure is investigated through indoor tests focused on sea ice impact. The effect of main factors on wear thickness is examined as parameters such as sea ice temperature, impulse and momentum of sea ice, impact ice load, sand inclusion and so on. It is shown that wear thickness can be estimated by impact ice load (pressure) at the real contact area between sea ice and rust layer.