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혼화재 종류 및 치환율에 따른 모르터의 조기강도 특성에 관한 연구
최세진,이성연,김성수,Choi, Se-Jin,Lee, Seong-Yeun,Kim, Sung-Su 한국건축시공학회 2007 한국건축시공학회지 Vol.7 No.2
Recently, due to the increase of high-rise buildings construction, many researches for making harden of concrete earlier and remove of forms faster are being performed to reduce construction period. In this study, we compared and analysed the early strength properties of mortar according to the kinds and replacement ratio of mineral admixture to select the kinds and replacement ratio of mineral admixture of high early strength concrete. For this purpose, mortar mixtures according to the kinds(FA, MK, ZR, BFS, DM) and replacement ratio(0, 2, 4% by volume of sand) of mineral admixture were selected. From our test data, early-age compressive strength decreased in accordance with the increase of replacement ratio of fly-ash(FA) & blast furnace slag powder(BSF) and, in case of addition admixture, early-age compressive strength of with containing 4% appeared higher compared with containing 2%.
대공간 건축물 Erection 공법에 관한 사례 조사 연구
정환목,이성연,지석원,Jung, Hwan-Mok,Lee, Seong-Yeun,Jee, Suck-Won 한국공간구조학회 2007 한국공간구조학회지 Vol.7 No.2
최근 산업 발전과 더불어 대공간 건축물의 수요가 급증하고 있다. 이 분야 선진 기술은 지간 300m 이상의 대공간 건축물 실현도 가능하게 하고 있다. 대공간 구조에는 쉘구조, 스페이스 프레임 구조, 막구조, 케이블구조 등이 있다. 대공간 건축물은 기둥 없이 넓은 공간을 확보해야 하는 구조적 특성 때문에 설계초기 단계에서부터 시공문제를 병행하여 검토할 필요가 있다. 대공간 건축물 시공에 있어서 erection 공법은 공사비용, 공사기간 그리고 안전성 등에 큰 영향을 주는 것으로 알려져 있다. 대공간 건축물 erection 공법은 현장 여건 및 제반 조건에 따라서 그 수를 헤아릴 수 없을 정도로 많고 다양하지만, 대표적인 공법으로는 Element 방식, Block 방식, Sliding 방식, Lift-up 방식 그리고 복합방식 등이 있다. 본 연구에서는 기존 대공간 건축물을 대상으로 시공당시 적용한 erection공법을 조사하여 이것을 규모별, span별, 층고별, 구조형식별로 분석 및 검토하여 향후 대공간 건축물의 효율적 erection 공법 개발을 위한 기초 자료를 제공하는데 그 목적이 있다. Recently, the demand of the large span structures has been increasing. The large span structures include such a large scaled structures such as: the shell structure, the space frame structure, the membrane structure and the cable structure, etc. The large span structures are supposed to be confirmed and issued carefully at the initial process of the design besides the construction engineering aspects because of the structural specific cause that should solve and accomodate those large and wide space without columns. In the field of the large span structure construction, the erection construction method has been regarded as a major affected aspects on the construction cost, construction term, and stability. In the field of the large span structure construction, there are various construction method and system could be applied depends on the condition of the construction site and other circumstances such a major construction method as: the element method, the block method, the sliding method, the lift-up method and complexed method, etc. In this study, as the case study of the erection construction method of the large span structures, after survey and study that those existing large span structures construction cases which had applied and adopted the election construction method and analysis and classify into the Uoups by the size, span, ceiling height, structural system in odor to supply and suggest the data for the enhancement and development in the field of the erection construction method as a efficient structural solution of the large span structure construction.
섬유 혼입률 변화에 따른 고성능 콘크리트의 폭열방지 성능
김기훈(Kim Ki Hoon),황인성(Hwang Yin Seong),김경민(Kim Kyoung Min),이재삼(Lee Jae Sam),이성연(Lee Seong Yeun),한천구(Han Cheon Goo) 한국구조물진단유지관리학회 2004 한국구조물진단학회 학술발표회논문집 Vol.- No.-
This paper is to investigate the fundamental properties and spalling prevention of high performance concrete using Polypropylene fiber(PP) and steel fiber fiber contents were vaned An increase m fiber contents resulted in a reduction of fluidity. Compressive strength using PP fiber exhibited a reduction while using steel fiber caused an increase in compressive strength Based on the results of fire enduring test for 3hours, control concrete occurred with severe failure, Increase of steel fiber had no relation to spalling resistance, while use of PP fiber had an effect on prevention of spalling because of discharging vapour pressure Residual strength of concrete using steel fiber reduced to 5% of anginal strength caused by mass loss and internal cracking It was found that use of PP fiber enhanced residual strength by as much as 35% compared With control and steel fiber concrete.
손호정 ( Son Ho-jung ),이정아 ( Lee Joung-ah ),한창평 ( Han Chang-pyung ),이성연 ( Lee Seong-yeun ),양성환 ( Yang Seong-hwan ),한천구 ( Han Cheon-goo ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.2
This research analyzed the heat resistant characteristics of high strength concrete by varied thicknesses of CFT steel plate for 300×300×600 mm RC column member, and has shown the following results. As for the characteristics of unhardened concrete, the air amount and slump flow did not show any difference whether fiber is mixed, however both were shown to satisfy the target range. On the characteristics of hardened concrete, the compression strength by the ages, which is over 83.9 MPa, showed high strength range, and the case where NY+PP(0.05) fiber is mixed in showed a tendency to increase minutely compared to plane where fiber is not mixed in. As for heat resistant characteristics, the cases of 3.0 mm, 4.5 mm and 6.0 mm CFT thicknesses where fiber is not mixed in showed slight improvement of heat resistance as steel plate became thicker, but showed fracture phenomenon, and 6.0 mm thickness CFT where NY+PP(0.05) fiber is mixed in maintained the original look of test body, implying sound condition, which in turn signifies the importance of organic fiber mix-in in CFT structure as well. At this time, main bar highest temperature, 520.8℃, showed relatively good temperature history.
섬유 혼입률 변화에 따른 고성능 콘크리트의 폭열방지 성능
김기훈 ( Kim Ki Hoon ),황인성 ( Hwang Yin Seong ),김경민 ( Kim Kyoung Min ),이재삼 ( Lee Jae Sam ),이성연 ( Lee Seong Yeun ),한천구 ( Han Cheon Goo ) 한국구조물진단유지관리공학회 2004 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.8 No.2
This paper is to investigate the fundamental properties and spalling prevention of high performance concrete using Polypropylene fiber(PP) and steel fiber. fiber contents were varied. An increase in fiber contents resulted in a reduction of fluidity. Compressive strength using PP fiber exhibited a reduction while using steel fiber caused an increase in compressive strength. Based on the results of fire enduring test for 3hours, control concrete occurred with severe failure. Increase of steel fiber had no relation to spalling resistance, while use of PP fiber had an effect on prevention of spalling because of discharging vapour pressure. Residual strength of concrete using steel fiber reduced to 5% of original strength caused by mass loss and internal cracking. It was found that use of PP fiber enhanced residual strength by as much as 3.5% compared with control and steel fiber concrete.