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해수전착 코팅을 이용한 내부식성 철근의 개발 및 적용성에 대한 연구 2 : 해수전착된 구조용 철근의 적용성 평가
권성준,이상민,박상순 한국구조물진단유지관리공학회 2012 한국구조물진단유지관리공학회 논문집 Vol.16 No.6
해수에 노출된 콘크리트 구조물은 시간의 경과에 따라 철근부식이 야기될 수 있으며, 이는 구조적인 성능저하로 진전된다. 1단계 연구에서 도출된 해수전착시스템의 개발을 통하여 2단계 연구에서는 해수전착 코팅된 철근 및 코팅철근을 사용한 RC 콘크리트 부재의 구조적, 내구적 성능이 평가되었다. 내구적 성능평가에서는 반전위 측정이 수행되었는데, 코팅된 철근은 일반철근의 35%수준의 부식속도를 가지고 있었으므로 높은 내부식성을 확보하고 있었다. 구조실험에서는 직접인장시험, 부착력시험, RC 부재를 이용한 휨 및 전단시험이 수행되었다. 인장강도 시험에서는 3.2%, 부착성능에서는 8.8%의 강도 증가가 코팅된 철근에서 평가되었다. RC보에 대한 실험에서는 최대하중 및 파괴형태는 두가지 경우에서 거의 동일하게 평가되었다. 해수전착된 시편은 철근주위에 콘크리트와 비슷한 화합물(수산화마그네슘, 탄산칼슘)이 형성되므로 부착력 및 강도를 일부 증가시키는 것으로 평가되었다. 해수전착철근은 피로, 내충격성, 장기침지실험 등을 통하여 성능이 입증되면 더욱 활발하게 사용될 것으로 사료된다. When RC (Reinforced Concrete) structures are exposed to sea water, steel corrosion can occur and this leads a degradation of structural performance. Referring the electro-deposition system with sea water from the 1st step research, durability and structural performance are evaluated in coated steel and RC members containing it in the 2nd research. In the durability performance test, Half Cell Potential test is performed and the coated steel is evaluated to have the high resistance to corrosion, which shows only 35% of corrosion velocity in normal (bare) steel. In the structural performance test, tensile strength, adhesive strength, and flexural/shear in RC member are performed. For the electro-deposit coated steel, increasing ratios of 3.2% and 8.8% are evaluated in the test of tensile strength and adhesive strength, respectively. For the structural test in RC member, there is no big difference between RC members with coated and non-coated steel in ultimate load and failure pattern It is evaluated that the chemical compound with CaCO3 and Mg(OH)2 from electro-deposition causes slightly increased structural performance. The electro-deposit coated steel can be more widely applied after performance verification from several tests like fatigue, resistance to impact, and long term-submerging test.
해수환경중 전착원리에 의해 형성시킨 환경친화적인 코팅막의 특성 분석
백상민(S-M Baek),이찬식(C-S Lee),김기준(K-J Kim),문경만(K-M Moon),이명훈(M-H Lee) 한국마린엔지니어링학회 2005 한국마린엔지니어링학회 학술대회 논문집 Vol.2005 No.-
??Cathodic protection is one of the successful ways to prevent corrosion of steel structures in marine environments. The unique feature of cathodic protection in seawater is the formation of calcareous deposits on cathodic metal surface. The formation principles of calcareous deposit seawater had been known for a long time. That is, cathodic reduction reactions associated with cathodic protection in seawater generate OH? at the metal surface in accordance with the formular ; 1/2 O₂+ H₂O + 2e? → 2OH? and 2H₂O + 2e? → H₂ + 2OH?. These reactions increase the pH at the metal / seawater interface. The high pH causes precipitation of Mg(OH)₂ and CaCO₃ in accordance with the formular ; Mg²? + 2(OH)? → Mg(OH)₂ and Ca²? + HCO?₃ + OH? → H₂O + CaCO₃. These are typically the main compounds in calcareous deposits. It obviously has several advantages compared to the conventional coatings, since the environment-friendly calcareous deposit coating is formed by the elements(Mg²?, Ca²?) naturally present in seawater. In this??study, environmental friendly calcareous deposit films were prepared on steel plates by electro plating technic in natural seawater. The influence of current density on composition ratio, structure and morphology of the coated films were investigated by scanning electron microscopy formation process of calcareous deposits films in natural seawater. And we confirmed the properties of all the films can be improved greatly by controlling the material structure and morphology with effective use of the electroplating method in natural seawater.