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광미를 사용한 폴리머 시멘트 콘크리트의 강도 특성 및 내약품성
이병철,이주경,이윤수,이필호,이구연,전철수 강원대학교 부설 석재복합신소재 제품연구센터 1999 석재연 논문집 Vol.4 No.-
본 연구는 세골재의 일부를 광미로 치환하고 혼화제로 SBR 라택스를 사용하여 폴리머 시멘트 콘크리트 공시체를 제작한 후 강도특성 및 내약품성을 실험적으로 구명한 것이다. 그 결과 광미를 사용하지 않고 P/C비가 10%일 때 압축강도가 323㎏/㎠로 최고 값을 나타냈으며, 휨강도는 P/C비가 증가할수록 증가하여 P/C비가 10%일 때 89㎏/㎠를 나타냈다. 그리고 광미를 사용한 경우는 P/C비가 10%일때 압축강도가 357㎏/㎠, 휨강도가 92㎏/㎠로서 광미를 사용하지 않은 경우보다 높게 나타났다. 한편 10% HCI, 20%, NaOH 10% NaCl 수용액에 공시체를 3, 7, 14, 21, 28일간 침적 시킨 후 중량변화를 측정하여 내약품성을 실험한다. 광미를 사용한 경우가 우수한 내약품성을 나타냈다. 즉광미를 사용하지 않은 경우 P/C=0%일 때 28일 후 중량 변화가 11%였으나 P/C=20%일 때는 2%였고, 광미를 사용한 경우는 P/C=0%일 때 질량 변화가 6%였으나 P/C=20%일 때는 1.5%였으며 20% ,NaOH 10% NaCl 수용액에서는 질량이 증가하는 경향을 보였다. Polymer cement concrete is made by the modifying ordinary cement concrete with polymer additive. Until now polymer cement concrete is not used for the structural member, but it is growing to be considered as developing uses such as a waterproof of roof slab, and a road pavement. The polymer cement concrete, being used for those uses, is superior to the cement concrete against the inorganic, organic acid, salt of acetic acid and organic solvents generally. In this paper, the polymer cement concrete was made by the ratio of 1:1 of sands and metal-mine waste rocks in fine aggregate in order to solve the environmental pollution which causes the social problem by metal-mine waste rocks. It was measured for the compressive strength, flexural strength, and chemicals resistance was tested by dealing with 10% HCI, 20% NaOH and 10% NaCI aqueous solution.
Study for Roles of Major Players in Technology Commercialization Processes and their Case Studies
Jongtaik Lee,Jeongsik Lee,Byungcheol Kim,Yun Jeong Choi 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.2
Technology commercialization network platform includes several major players such as principal investigators, technology licensing offices, accelerators or incubators, innovation capitalist, local governments and they have their own specific roles in enabling or facilitating the transition from embryonic technologies to markets. This study includes case studies involved with major players in technology commercialization processes as well as their roles, and case studies focus on the case of Georgia Institute of Technology and the State of Georgia for a more effective discussion. Particular interests are paid in the information flow between, and the incentives for, each of these network participants.
Ring Expansion Reactions via Endocyclic Cleavage of Cyclopropylcarbinyl Radicals
Phil Ho Lee,Byungcheol Lee,Jukyoung Lee,Seung Ki Park 강원대학교 기초과학연구소 1999 기초과학연구 Vol.10 No.-
Ring expansion reactions via endocyclic cleavage of cyclopropyl-carbinyl radicals are described.
루프가 형성된 부직포를 이용한 차량용 고흡음성 헤드라이닝
이수남(Sunam Lee),이원구(Wonku Lee),조병철(Byungcheol Cho),조윤진(Younjin Cho) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
The function of headlining is to raise merchantable quality and comport to by making interior view of automotive more graceful. Preventing damage to the passenger"s head in the event of car crash could be another function of it. Materials of which targets are light weight, high performance, luxury and eco-friendliness have been developed recently. In this study, needle-punched nonwovens which consist of polypropylene fibers and glass fibers were produced by needle-punching process, and then a composite nonwoven of 3D structure was prepared by two looped nonwoven which were made of needle-punched nonwovens by loop-punching process. The absorption coefficient test result showed that the acoustic performance of a developed product having bulky structure was better than those of the conventional product and the durability test result showed that the deformation of a developed product did not occur after environment test.
이수남(Sunam Lee),조병철(Byungcheol Cho),정선경(Sunkyoung Jeoung),이평찬(Pyoungchan Lee) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
The function of headlining is to raise merchantable quality and comport to by making interior view of automotive more graceful. Preventing damage to the passenger’s head in the event of car crash could be another function of it. Moreover, it has NVH performances that decrease noise and vibration due to the rain and wind from roof and also increase quietness by absorbing noise in the car. In this study, sound-absorbing materials using melt-blown nonwoven and needle-punched nonwoven to achieve the high sound absorption performance, and then evaluated to meet a requirement for the automotive component. The test results showed that the acoustic performances of developed products having new laminated structure were better than those of the conventional product.