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If offshore structures are constructed in sea ice regions,wear of the surface of the structures by ice sheet which moves horizontally and vertically by tidal actions must be taken into consideration.The authors have carried out systematic experiments on the abrasion of various materials(various concrete,steel and various coatings)for about ten years.In these experiments,wear tester of reciprocating abrasion type which had been developed by Saeki et al was used.In this paper,the authors clarified the abrasion rate of various kinds of stones(granite,tuff,sandstone and andesite)through systematic experiments.