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콘크리트의 황산화 세균 억제를 위한 항균제의 항균성능 연구
최홍식 ( Choi Hong-shik ),허권 ( Heo Gweon ),이성태 ( Lee Seong-tae ),유성원 ( Yoo Sung-won ),곽홍신 ( Kwak Hong Shin ) 한국구조물진단유지관리공학회 2007 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.11 No.2
This study was performed to evaluate antibacterial performance of various antibiotics. By MIC test, organic antibiotic group shows the most effective improvement in antibacterial performance than other metallic antibiotics groups and metal salts and it has more effective results on reduction of thiobacilus bacteria than the method of elimination the antibiotics with metals.
최홍식(Choi, Hong-Shik),허권(Heo, Gweon),이시우(Lee Si-Woo),곽홍신(Kwak, Hong Shin),안지은(An Ji Eun) 한국구조물진단유지관리학회 2009 한국구조물진단학회 학술발표회논문집 Vol.2009 No.2
This study was performed to evaluate antibacterial performance of various antibiotics. The concrete surface was decaied in the order of the higher humidity and the shading green algae. we evaluated the durabillity of the antibiotic concrete by the compressive strength and the chloride ion diffusion coefficients. It would be given as a conclusion that the antibiotics has an influence upon the concrete to increase the strength and decrese the rates of the chloride ion movements.
금속 및 금속염계 항균제가 첨가된 콘크리트의 염소이온 침투 평가에 관한 연구
최홍식 ( Choi Hong-shik ),허권 ( Heo Gweon ),이시우 ( Lee Si-woo ),류제천 ( Ryu Je-cheon ),곽홍신 ( Kwak Hong Shin ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.2
The purpose of this paper is to investigate coefficient of chloride ion diffusivity of concrete mixed antibacterial agent. For this purpose, the experiments carried out with metals(Cu, Zn) and metal salts(Cu(NO<sub>3</sub>)<sub>2</sub>, Zn(NO<sub>3</sub>)<sub>2</sub>) as the antibacterial agent. The diffusion coefficient of the Cu(NO<sub>3</sub>)<sub>2</sub> is the smallest because of the smallest Ksp. The durability of the concrete antibacterial agent depend on the Ksp and watertighnee by the metal and metal ion solubility.
최홍식 ( Choi Hong-shik ),허권 ( Heo Gweon ),이시우 ( Lee Si-woo ),곽홍신 ( Kwak Hong Shin ),안지은 ( An Ji Eun ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.2
This study was performed to evaluate antibacterial performance of various antibiotics. The concrete surface was decaied in the order of the higher humidity and the shading green algae, we evaluated the durability of the antibiotic concrete by the compressive strength and the chloride ion diffusion coefficients. It would be given as a conclusion that the antibiotics has an influence upon the concrete to increase the strength and decrese the rates of the chloride ion movements.
교량상 자갈궤도의 종저항력 특성 분석을 위한 실험 연구
민경환(Kyung-Hwan Min),곽홍신(Hong-Shin Kwak),이동규(Dong-Gyu Lee),윤경민(Kyung-Min Yun),임남형(Nam-Hyoung Lim) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10
교량상 자갈궤도의 안전성 평가를 위한 궤도-교량의 상호작용에 대한 해석을 수행할 때 도상의 비선형 거동을 고려해야 한다. 또한 온도 하중에 의해 발생한 저항력을 차량 재하 시 고려해야 하지만, 현재 지침이나 기준을 통해 제공되고 있는 물성치는 하중의 연성효과를 충분히 반영하지 못하고 있다. 따라서 하중이력을 고려한 물성치를 재평가하고 특성을 파악하기 위한 새로운 방식의 종저항력 평가가 필요하다. 본 연구에서는 바닥판과 도상 궤도를 모사한 실대형 실험체를 제작하고 교량상 자갈궤도의 종저항력 실험을 수행하여 거동을 분석하고자 하였다. When the interactions between ballasted track and bridge are analyzed for assessing safety of ballasted track on bridge, nonlinear behavior should be considered. Moreover, the vehicle load applied to bridge should be calculated taking the reaction force caused by thermal load into account. However, the resistance characteristics, provided by current design specifications and standards, do not consider the coupled load effects. Therefore, the new methods for evaluating longitudinal resistance are required in order to re-evaluate material properties considering load history. In this study, the longitudinal resistances of the ballasted track on bridge were analyzed by carrying out the experimental study with the test setup designed to simulate deck and bed track.
최홍식,허권,이호범,이시우,곽홍신,Choi, Hong-Shik,Heo, Kwon,Lee, Ho-Beom,Lee, Si-Woo,Kwak, Hong-Shin 한국건설순환자원학회 2013 한국건설순환자원학회 논문집 Vol.1 No.2
하수시설 및 복개 구조물 등은 용해 시 산성으로 작용하는 황화수소에 크게 노출되어, 황산화균의 작용에 의해 강산성의 황산이온이 생성된다. 이에 따라 콘크리트의 생화학적 부식에 의한 열화가 촉진되며, 콘크리트 손상을 더욱 가속화하여 내구성이 크게 저하될 수 있다. 본 연구에서는 콘크리트에서 황산화균이 유기 생체적으로 사용하는 황화수소를 제거하기 위해, 금속의 살균성을 이용하여 금속 및 금속염 분말을 콘크리트에 혼입한 후, 황산화 억제 성능을 평가하였다. 이를 위해 중성화한 콘크리트 시편의 황산화균에 대한 항균 성능을 비교 평가하였고, 급속 염소이온 침투시험을 통해 금속 및 금속염계 항균제 첨가량에 따른 콘크리트 염화물 침투깊이 및 확산계수를 측정하였다. 또한 야외에서 폭로시킨 콘크리트 시편의 표면 상태의 생화학적 상태를 관측하여, 항균콘크리트의 성능 및 적용성을 확인하였다. In the sewage structures and wastewater facilities, concrete is exposed to hydrogen sulfide ($H_2S$) which acts as an acid material in a solution, and a strongly acidic sulfate ion ($SO{_4}^{-2}$) is generated by a sulfuric bacteria. Hence, a degradation of concrete with biochemical corrosion would be accelerated. Finally, durability of concrete and concrete structures may be greatly reduced. In this study, in order to remove the hydrogen sulfide which is used by the sulfuric bacteria organic-biologically, the antibiotic metal and metallic salt powders were mixed to concrete, and a suppressing performance of the sulfate ion was assessed. For the sulfuric acid bacteria, a comparative evaluation of antimicrobial performance on neutralized concrete specimens were carried out, also by a rapid chloride penetration test, chloride penetration depths and diffusion coefficients were measured for antibiotic concrete in accordance with the amount of metal and metallic salt-based antibacterial agents. Eventually, by an observation of the biochemical state of the surface of concrete specimens exposed outdoors, the performance and applicability of antibiotic concrete were confirmed.
허권(Heo, Gweon),최홍식(Choi, Hong-Shik),이시우(Lee, Si-Woo),곽홍신(Kwak, Hong Shin),안지은(An, Ji-Eun) 한국구조물진단유지관리학회 2009 한국구조물진단학회 학술발표회논문집 Vol.2009 No.1
In this study, we research the concrete surface which is added the antibiotics(Cu, Zn, Cu(NO3)2, Zn(NO3)2. Antibiotic concrete have a resistance for the SO42-ion that is formed from the Thiobacillus thiooxidus on the culture ground. The result of this work is that the antibiotic concrete with Cu(NO3)2 in the best effect to the antibacterial performance.