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하이-볼륨 플라이애쉬 콘크리트의 황산마그네슘 저항성에 관한 연구
강수근,김영수 대한건축학회 2000 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.20 No.2
The purpose of this study is to investigate the magnesium sulfate resistance of high-volume fly ash concrete. In order to figure out the effects of magnesium sulfate solution on the durability of high-volume fly ash concrete, the experiments for the immerging test in the 10% magnesium sulfate solution was executed by selecting factors such as W/B, air content, fly ash replacement, and duration of immersing. It was found from the measurements of mechanical properties that the 55 and 65% replacement by fly ash were very effective in the improvement of the magnesium sulfate resistance of concrete. During 84days of exposure to the 10% MgSO₄ solution, high-volume fly ash concrete with the binder content of 450 ㎏/㎥ and with replacement level of 55% and 65% were steadily gained the compressive strength, and no detectable deterioration was observed.
High-Volume 플라이애쉬 콘크리트의 기포조직에 관한 연구
강수근,서완용,정철우,김영수 釜山大學校生産技術硏究所 2002 生産技術硏究所論文集 Vol.61 No.-
산업 부산물인 플라이애쉬를 사용한 콘크리트는 내부에 존재하는 다량의 플라이애쉬에 의해 발생하는 공극의 분화 효과에 의해 보통의 콘크리트와는 다른 기포조직을 가질 수 있다. 콘크리트가 동결작용을 받을 시 발생하는 수압을 완화할 수 있는 기포의 영향범위는 기포간의 거리에 의해 결정되며, 이것의 최대값이 기포간격수라고 불리고 있다. 본 연구에서는 High-Volume 플라이애쉬 콘크리트의 기포조직을 카메라를 통하여 입력된 화상의 데이터를 컴퓨터에 의해 정략적으로 처리하는 화상분석법을 이용하여, 연행공기량과 플라이애쉬 콘크리트의 공기량, 비표면적, 기포간격계수 등을 보통 콘크리트와 비교, 분석함으로서 High-Volume 플라이애쉬 콘크리트의 기포조직을 파악하고자 한다. The purpose of this paper is to investigate the air-void spacing factor of high-volume fly ash concrete. For this purpose, the air-void spacing factor of the hardened fly ash concrete was determined by image analysis method for a large number of parameters adjusting such as air contents and the rate of fly ash replacement. Based on the study of the test results, the following conclusions may be drawn. 1) As the rate of fly ash replacement for high-volume fly ash concrete increases, air contents decrease. Furthermore the air content is varied approximately 1 % before and after hardening. 2) As the replacement of fly ash increases, the spacing factor increases due to adsorption of air entraining agent. 3) As the air content decreases and the specific surface increases, the spacing factor of High-Volume fly ash concrete increases.
미소접합시험과 유한요소법을 통한 섬유/에폭시 복합재의 계면 전단강도 해석
강수근(Soo-Keun Kang),김덕재(Deok-Jae Kim),최낙삼(Nak-Sam Choi),이덕보(Deok-Bo Lee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.3
In this study, we performed the microbond test by utilizing the microbond specimen with an epoxy micro-droplet adhered onto a carbon fiber. The interfacial shear stress distributions along the fiber/matrix interface were calculated by finite element analysis with three kinds of finite element models such as droplet model, circular model and pull-out model. Conclusions were obtained as follows. (1) Interfacial shear stress distribution showed that larger stresses were concentrated in the fiber/matrix interface for microbond test than for pull-out test. Thus, debonding at the fiber/matrix interface during microbond test was liable to occur at low load level. (2) Microbond test showed higher interfacial strength which was caused by various effects of micro-droplet geometry and size as well as stress concentration in the region contacting with the micro-vise tip.
Water drop 가속시험에 의한 이온 마이그레이션 발생 메커니즘
이덕보(D. B. LEE),강수근(S. K. Kang),장석원(S. W. Chang),유동수(D. S. Ryu) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
In evaluation of electronic reliability on the PCB(Print Circuit Borad), electrochemical migration is one of main test objects. The phenomenon of electrochemical migration occurs in the environment of the hight humidity and the hight temperature under bias through a continuous aqueous electrolyte. In this paper, the generating mechanism of electrochemical migration is investigated by using water drop acceleration test under various waters. The waters used in the water drop test are city water, distilled water and ionic water. It found that the generated velocity of electrochemical migration depended on electrolyte quantity which included in the various waters.
이덕보(D. B. Lee),강수근(S. K. Kang),김정현(K. J. Kim),김주형(J. H. Kim),전영찬(Y. C. Jeon) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Surface design of dental post materials improves adhesive force between a post and a root dentin and has significant influences on the reliability in endodontically treated tooth. To investigate relationship between the design of shape and the strength of material, dental posts made of nickelchromium alloy were prepared. Three-point bending test was performed using the post material, which is utilized actually in teeth treatment. The fracture surface of specimen was examined by Scanning Electron Microscope(SEM) through failure analysis. Based on experimental results, the numerical analysis was simulated using ABAQUS, one of commercial software. The bending strength of modified post material model is higher than that of custom post material model. The modified design of the dental post material was also proposed.
이덕보(D. B. Lee),김정현(J. H. Kim),강수근(S. K. Kang),김상도(S. D. Kim),장석원(S. W. Chang),임재훈(J. H. Lim),유동수(D. S. Ryu) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In evaluation of electronic reliability on the PCB(Printed Circuit Board),electrochemical migration is one of main test objects. The phenomenon of electrochemical migration occurs in the environment of the high humidity and the high temperature under bias through a continuous aqueous electrolyte. In this paper, the generating mechanism of electrochemical migration is investigated by using water drop acceleration test under various waters. The waters used in the water drop test are city water, distilled water and ionic water. It found that the generated velocity of electrochemical migration depended on the temperature of water and the electrolyte quantity which included in the various waters.