凍害Ⅱ／複合劣化

[1144] INVESTIGATION OF THE STEEL CORROSION IN CONCRETE STRUCTURES DETERIORATED BY ASR AND INFLUENCED BY DE-ICING SALTS

Hong Sao HO¹, 久保善司², 菊池創太², 武内道雄³ (1.Kanazawa University 2.金沢大学 3.中日本ハイウェイ・エンジニアリング名古屋)

キーワード：ASR, De-icing salts, Combined deterioration, Chloride ions, Corrosion risk, アルカリシリカ反応, 凍結防止剤, 複合劣化, 塩化物イオン, 腐食リスク

Many concrete structures are currently affected by the alkali-silica reaction (ASR). In addition, the de-icing salts have sprayed in the winter to ensure the safety of vehicles. The in-situ survey was conducted to comprehend the steel corrosion in the abutments affected by the combined deterioration of ASR and de-icing salts. The result indicated the influence of water leakage included de-icing salts become a considerable cause of corrosion in ASR deteriorated structures. Furthermore, the evaluation of corrosion risk can carry out based on the surface moisture of concrete and chloride ions contents.