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유동우,최현국,이승헌,이세진,Yoo, Dong-Woo,Choi, Hyun-Kook,Lee, Seung-Heun,Lee, Se-Jin 한국건설순환자원학회 2011 한국건설순환자원학회지 Vol.6 No.2
본 연구에서는 현재 시멘트 콘크리트 혼합재로서 널리 사용되고 있는 고로수쇄 슬래그와 애쉬의 페이스트 유동특성을 파악하였다. 그 방법으로 혼합재 단독을 사용한 페이스트의 유동특성을 파악하여, 아래와 같은 결론을 얻을 수 있었다. 혼합재 단독의 페이스트 유동특성을 시험하기 위하여, 3종류의 분쇄기를 사용하여 3가지 입도로 분쇄된 분말을 제조하였다. 이 분말을 Rosin-Rammler 분포식을 사용하여 얻은 계수 n 값과 De 값을 유동특성과 비교 분석한 결과에서, 일반적으로 같은 입경 크기 일 때 Ash 분말이 Slag 분말보다 소성점도 및 항복응력이 높았으며, 또한 동일 n 값에서 Ash 분말이 Slag 분말 보다 비교적 높은 소성점도와 항복응력을 나타내었으나, 입도분포 폭의 변화에는 Slag 분말이 Ash 분말 보다 민감한 유동특성의 변화 경향을 나타내었다. This study examined rheological properties of blast furnace slag and ash paste that are widely used as cement concrete for mineral admixture in current. In that way rheological properties of the paste of mineral admixture only was examined. The result of this study were as follow: In order to analyze that the rheological properties of the mineral admixture only, fine particles were produced with grinding machine to 3 particle sizes. These powders in general from the result of comparison with and analysis of rheological properties and the coefficient n and De values. The result that ash powder was higher in plastic viscosity and yield stress than Slag powder, and with the same n value, ash powder showed higher plastic viscosity and yield stress than Slag powder. But Slag powder in particle size distribution showed a sensitive tendency on changing in rheological properties.
저온환경하 콘크리트 시공을 위한 영하온도 경화가능형 시멘트 모르타르 및 단열 · 발열거푸집 개발에 관한 실험적 연구
김목규(Kim, Mok-Kyu),박장현(Park, Jang-Hyun),김형철(Kim, Hyeong-Cheol),최현국(Choi, Hyun-Kook),이한승(Lee, Han-Seung) 대한건축학회 2016 大韓建築學會論文集 : 構造系 Vol.32 No.5
Domestic construction market is congested enough at the moment cause enterprises to enter overseas market such as Mongolia and Russia. However most previous studies conducted at a temperature above freezing. In this study, performance analysis of cement mortar was conducted without extra heating air supplying at a low temperature below freezing. For this study, all of materials for experiment were kept in a low temperature for 48 hours before mortar mixing. After mortar curing at low temperature, compressive strength was measured at the early ages. Also, properties of hardened cement material was analysed using TG-DTA and MIP. At experiment series 1, to figure out whether cement hydration reaction at low temperature below freezing is possible or not, use anti-freezing agent to protect freezing of water used in mortar mixture and analyze increasing amount of Ca(OH)₂, chemical bound water contained in mortar by usage of hardening accelerator and curing period at low temperature condition. At experiment series 2, insulated and heating form have been used with mortar has same mix proportion as series 1. Thermal performance and compressive strength of mortar are conducted and analyzed excremental result according to the variable form types. Especially, high fineness cement is considered to use with insulated form. Hydration heat of quicklime is used for heating form in this study. The analysis of this study confirmed that high fineness cement with insulated form and heating form can be suitable to be used in low temperature environment.
정철영(Chyul Young Jyung),이광호(Kwang Ho Lee),최현국(Hyun Kook Choi),정진철(Jin Chul Jeong),고재성(Jae Sung Go) 한국직업교육학회 1999 職業 敎育 硏究 Vol.18 No.2
Both academic high schools and vocational high schools have failed to meet the various needs of high school students. Therefore, alternative high school systems were explored. Ministry of Education suggested one of the alternatives would be an integrated high school system. The purpose of this study was to assess the needs of stakeholders in secondary vocational education on the adoption of an integrated high school system. Those stakeholders were students, parents, teachers, and principals of vocational high schools as well as personnels managers in various companies. This study was conducted through both reviewing literatures available and surveying. The major finding of the study were as follows: 1) Most stakeholders perceived that an integrated high school system would have positive impacts. 2) The integrated high school system was not perceived as an effective alternative to the current vocational high school system which faced various problems. 3) If the integrated high school system will be adopted, it should be applied to all the high schools regardless their school type and location. 4) Problems would be anticipated if the integrated high school system would be adopted to the vocational high schools. It was concluded that the adoption of an integrated high school system should be decided after being pilot-tested for at least three years and the new system should be adopted to academic high schools at the same time.