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수처리시설용 콘크리트의 금속용사 피막 종류에 따른 내오존성 및 전기화학적 방식 성능 평가
박진호,최현준,이한승,김상열,장현오 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 논문집 Vol.23 No.4
As the pollution of water resources deteriorates due to industrialization and urbanization, it is difficult to supply clean water through awater treatment method using chlorine. Therefore, the introduction of advanced water treatment facilities using ozone is on the increase. However,epoxy which is used as waterproofing and anticorrosives and stainless steel used in conventional waterproofing and anti-corrosive methods havedeteriorated because of the strong oxidizing power of ozone, causing problems such as leaking. Moreover, it even causes the durability degradationof a concrete. Therefore, in this study, metal spraying system was used as the means of constructing a metal panel with excellent ozone resistance andchemical resistance which is an easier method than an existing construction method. Ozone resistance was evaluated in accordance with the type ofmetal sprayed coatings to develop a finishing method which can prevent the concrete structure of water treatment facilities from deterioration. Furthermore, electrochemical stability in actual sewage treatment plant environment was evaluated. Experimental results showed that Ti has superiorozone resistance after spraying and the electrochemical stability in the sewage treatment plant environment showed that Ti has the highest polarizationresistance of 403.83 k ∙ Ω ⋅ cm 2, which ensures high levels of durability. 산업화, 도시화로 인해 수자원의 오염이 악화 되면서 기존에 염소를 이용한 정수처리 방법으로는 깨끗한 물을 공급하는데 어려운실정이다. 이에 오존을 이용한 고도정수 처리 시설의 도입이 증가하고 있다. 그러나 기존의 방수⋅방식 공법으로 사용되는 에폭시계 방수⋅방식제 및 스테인리스는 오존의 강력한 산화력으로 인해 열화되어 박리 등 문제 발생하였으며, 콘크리트까지 영향을 미쳐 내구성 저하의 원인이된다. 이에 따라 본 연구에서는 내오존성 및 내화학성이 뛰어난 금속 패널을 기존의 시공법 보다 손쉬운 방법으로 시공하기 위한 방법으로 금속용사 공법을 이용하여 수처리 시설 콘크리트 구조물의 열화를 원천적으로 방지하기 위한 마감공법 개발 연구의 일원으로 용사금속 종류 에 따른 내오존성 평가를 실시하였으며, 실제 하수처리장 환경에서의 전기화학적 안정성능 평가를 실시하였다. 실험결과 용사금속 Ti이 용사 후에도 내오존성이 뛰어난 것으로 나타났으며, 하수처리장 환경에서의 전기화학적 안정성능 평가 결과 용사금속 Ti가 403.83k∙ Ω∙cm2의 가장 높은 분극저항을 나타남으로써 높은 수준의 내구성을 확보하는 것을 확인할 수 있었다.
타펠 외삽법을 이용한 NaCl 및 LiNO2가 첨가된 철근 콘크리트의 방식성능 평가에 관한 실험적 연구
박동진 ( Park Dong-jin ),박장현 ( Park Jang-hyun ),김영관 ( Kim Yeung-kwan ),이한승 ( Lee Han-seung ) 한국건축시공학회 2017 한국건축시공학회 학술발표대회 논문집 Vol.17 No.1
Corrosion of reinforced concrete embedded in concrete is a deterioration phenomenon due to intrusion of embodied or Airborne chloride ions. Corrosion of a embedded steel increases the volume of the rebar and causes damage to the structure such as cracking and peeling of the concrete. This causes penetration of various corrosive factors and accelerates the corrosion of reinforcing bars, which has a serious effect on the durability of the structure. Researches on the corrosion phenomenon of these rebars by electrochemical methods have been carried out for a long time, but it is a lack of research in Korea. Therefore, in this study, one of electrochemical experimental methods, Tafel extrapolation method, was used to evaluate the performance of reinforcing bars according to the amount of NaCl and LiNO<sub>2</sub> added to concrete.
Corrosivity Evaluation of SWRO Membrane Desalted Permeate
우달식,황병기 대한토목학회 2014 KSCE JOURNAL OF CIVIL ENGINEERING Vol.18 No.1
To evaluate the corrosivity of seawater, the SWRO (Sea Water Reverse Osmosis) produced water, and the community tap water were used in this study. Weight loss method and potentiodynamic polarization test were applied to compare the corrosivity between them. Coupons and pipes for the experiments were prepared with the same materials such as carbon steel, zinc, copper, and STS304achieved in equivalent condition. As a result of experiments, seawater showed constituent ions such as Cl−, SO42−, Mg2+, and Ca2+ (in order of abundance), while the SWRO produced water showed lower pH, calcium hardness and alkalinity than the tap water. Since chloride ion, as an acceleration factor of corrosion, was highly detected, the test results of weight loss method and potentiodynamic polarization indicated that release of metal ions and weigh loss were more abundant in the SWRO membrane desalted permeate than in the tap water. Besides, corrosion potential was also lower in SWRO membrane desalted permeate. It represents that the surface of metal could be exposed easily to oxidize in SWRO condition due to low dissolved alkali metal ion of water.