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In arctic sea regions a concrete sea structure is subjected to heavy mechanical loads near the water level due to the moving ice sheets. The determination of the abrasion depth is based on laboratory tests for measuring ice pressures against protruding aggregate stones, laboratory tests for determining the strength values of concrete after freeze-thaw cycles in sea water, abrasion tests with an abrasion machine, abrasion tests with an icebreaker at sea, abrasion studies on Finnish lighthouses, and computer calculations. The abrasion depth and resistance of concrete in arctic sea conditions can in practice be determined by calculations and laboratory tests. When determining the abrasion depth by calculation the various strength values of concrete must be known under freeze-thaw conditions. Both the compressive and tensile strength of concrete in addition to the bond strength between aggregate stones and cement stone must be known. The bond strength of aggregate stones and its resistance to repeated freeze-thaw cycles are especially crucial.