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고온 및 하중 재하조건을 고려한 콘크리트의 역학적 특성 평가
김규용,이태규,민충식,이계혁,남정수,김영선,Kim, Gyu-Yong,Lee, Tae-Gyu,Min, Choong-Siek,Lee, Kye-Hyouk,Nam, Jeong-Soo,Kim, Young-Sun 대한건축학회 2011 대한건축학회논문집 Vol.27 No.3
It was experimentally investigated in effects of high temperature and loading condition on the mechanical properties of concrete. This study is aimed to study the effect of elevated temperatures on mechanical properties of concrete according to compressive strength under loading. Tests were conducted on ${\O}100{\times}200mm$ cylinder specimens, which were tested under both stressed and unstressed conditions by steady-state test. The specimens were under-loaded to 0, 20, 40 percent of their ultimate compressive strength at room temperature and subjected to temperatures ranging from 100 to $700^{\circ}C$, and the residual compressive strength compared to that observed at $20^{\circ}C$. As a result, effect of mechanical properties of concrete at elevated temperature was especially subjected to transient creep more than thermal strain under loading in case of over $500^{\circ}C$.
섬유보강 순환잔골재 콘크리트의 공학적 특성 및 수축균열저감특성에 관한 실험적 연구
김규용,남정수,김무한,이도헌,송하영,Kim, Gyu-Yong,Nam, Jeong-Soo,Kim, Moo-Han,Lee, Do-Heun,Song, Ha-Young 한국건설순환자원학회 2009 한국건설순환자원학회지 Vol.4 No.3
최근 국내에서는 건설생산현장에서 순환골재 및 이를 활용한 순환골재 콘크리트의 사용을 적극적으로 도모하기 위하여 순환골재 콘크리트의 제조기술에 관한 다양한 연구개발이 활발하게 이루어지고 있으나 순환굵은 골재에 비하여 순환잔골재에 관한 적용 및 연구는 미흡한 실정이다. 따라서 본 연구에서는 순환잔골재를 사용한 환경부하저감형 콘크리트의 공학적 성능 및 수축균열저감 성능 향상을 위한 섬유보강 순환잔골재 콘크리트의 공학적 특성 및 수축균열특성에 관하여 실험 실증적으로 비교 검토함으로써 향후 환경부하 저감형 섬유보강 순환잔골재 콘크리트의 개발을 위한 기초자료를 제시하고자 한다. 그 결과, 천연잔골재에 비해 순환잔골재의 사용으로 콘크리트의 균열면적이 증가하였으며, W/C비가 증가할수록 균열면적도 증가하는 것으로 나타났다. 또한 섬유종류중 PVA 및 Nylon섬유를 혼입한 시험체의 균열면적이 가장 적은 것으로 나타났으며, 섬유혼입율이 증가할수록 균열면적이 감소하는 것으로 나타나 섬유혼입에 의한 균열저감성능을 확인할 수 있었다. Recently, the study is progressing actively about manufacture skill of concrete for promoted recycled aggregate and concrete made into recycled aggregate in the construction production field. But, application and study about recycled fine aggregate insufficient compared to recycled coarse aggregate. So, in this study, it presents basic data for development of environmental load reduction fiber reinforcement recycled fine aggregate concrete by comparison and investigation about engineering properties and shrinkage cracking of fiber reinforcement recycled find aggregate concrete for increasing shrinkage cracking reduction and long term stability of environmental load reduction concrete used recycled fine aggregate. In the result of the study, compared to natural fine aggregate, a crack-extent increased by applying recycled fine aggregate, moreover, as a water cement ratio increased, the crack size increased, as well. In addition, it's shown that the specimen mixed with PVA and Nylon, among all kinds of fibers, showed the smallest crack size, so it's verified that the mix of fiber had an effect on decreasing crack-extent.
건설구조물(建設構造物)의 장수명화(長壽命化)와 건설폐기물(建設廢棄物)의 유효이용기술(有效利用技術)
김규용,최형길,남정수,송하영,이도헌,Kim, Gyu-Yong,Choi, Hyeong-Gil,Nam, Jung-Su,Song, Ha-Young,Lee, Do-Heun 한국자원리싸이클링학회 2009 資源 리싸이클링 Vol.18 No.3
최근 지구환경의 문제가 사회적 이슈로 부각됨에 따라 자원절약 및 자원의 유효이용이라는 측면에서 일상생활에서부터 각종 산업분야에 이르기까지 재활용과 자원절약에 관한 관심이 날로 심화되고 있는 가운데 지구 온난화 방지, 자연환경파괴의 방지, 폐기물에 의한 환경오염 방지 등 지구환경보전 측면에서 콘크리트용 골재 자원의 고갈, 시멘트 소성에너지, $CO_2$ 저감 등은 해결이 불가피한 문제로서의 당면한 과제이다. 이에 따라 건설 산업의 분야에 있어서도 건축물의 내부에 축적되어 있는 막대한 양의 자원을 유효하게 활용하고 내구수명이 길게 설계된 장수명화 건축물을 안전하고 쾌적하게 유지 관리함으로써 불필요한 건설행위를 억제하여 지구자원 및 에너지를 절감하는 창조적인 사고가 필요하다고 할 수 있다. 본고에서는 건설폐기물 발생 억제 및 유한한 지구자원의 유효이용과 재활용을 활성화시킴으로서 지구환경부하 저감을 위한 건축생산 및 건축물의 성능설계 측면에서 건축적 요구와 지구환경을 고려한 건축물의 장수명화를 위한 방법 및 건설폐기물의 유효이용기술에 대해 소개하였다. Recently the problem of global environment is became by social issue. Accordingly the interests to recycling and saving of resources are growing from daily life to varieties field of industry. To preserve the global environment, prevent global warming, environmental destruction, environmental pollution by wastes, the drain of aggregate, plasticity energy of cement and decrease in carbon dioxide are an urgent problem that must be resolved. So there is to a field of building industry and stands but on the inside of the building the many double meaning resources usefully, applies. Also the seller masterpiece building where the service life is long planned is safe and comfortably, maintenance, suppresses the construction which is not necessary is unnecessary. Also the seller masterpiece building where the service life is long planned is safe and comfortably, maintenance, suppresses the construction which is not necessary is unnecessary. By revitalizing effective use of limited earth resources, recycling and controling production of construction waste, this study introduced to a method for Long-Term Durability of Construction Structure and Effective Use of Technology for Construction Waste considering architectural demand and earth environment. It is for reduction of an earth environment load from the side of construction production and performance design of a structure.
콘크리트의 고온특성 평가를 위한 열전달가열 시험방법에 관한 기초적 연구
김규용(Kim Gyu-Yong),김영선(Kim Young-Sun),이태규(Lee Tae-Gyu),윤문기(Yoon Moon-Kee) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.4
The performance deterioration of concrete by high temperature provokes deformation of important structural materials like the column. Eventually, it brings collapse of construction. The deformation of column is caused by many factors like load, thermal expansion and creep, and These factors change as temperature changes. Therefore, It is very difficult to estimate behavior of concrete structure by fire and fire performance design. Furthermore, even though Japan, Europe and America have been doing various experimental studies on the properties of concrete at high temperature to solve these problems, Different results would be evaluated following to the heating method, heating time, size of specimen and performance of the loading and heating machine because there is no unified experiment method. Thus, this study is to represent heating and loading machine and experimental method which is developed in this study in order to identify analysis of behavior, improvement of fire performance design and experimental method of the properties of concrete at high temperature. This research is to present basic data on the properties of concrete at high temperature by reporting the result of this study.
탄산화 및 염해의 복합작용에 의한 콘크리트의 결합재 구성에 따른 내구성능 평가에 관한 실험적 연구
김규용(Kim Gyu-Yong),김영봉(Kim Young-Bong),김영선(Kim Young-Sun),조봉석(Cho Bong-Suk),김무한(Kim Moo-Han) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.8
Durability evaluations to assess the deterioration of reinforced concrete structures in the present have been considered only individual deterioration factors such as salt damage and carbonation. Also, indoor accelerated experiments have not been able to realize the combined deterioration factors that actually affect real concrete structures. Therefore, in this study, mixing design was proportioned with the various water-binder ratio 0.55 binder compositions corresponding to TypeⅠ cement without any supplementary materials (OPC), TypeⅡ cement with 50% blast-furnace slag replacement (BFS50), TypeⅢ cement with 15% fly ash replacement (FA15), and ternary cement with TypeⅣ cement, 15% fly ash, and 35% slag replacement (BFS35 / FA15). And this study is carried out to compare individual deterioration test with combined deterioration test and to investigate the effect of the permeation of deterioration factors such as CO2 and chloride ion under the combined deterioration environments. After setting up various deterioration factors and levels such as carbonation, salt damage, and the repetition of drying-wetting, items such as carbonation, chloride ion penetration were evaluated under the combined deterioration environments. The results showed that carbonation and chloride ion penetration depth were increased according to the combined deterioration environments.
고온가열에 의한 CFT Stub Column의 역학적 특성평가
김규용(Kim Gyu-Yong),이태규(Lee Tae-Gyu),김영선(Kim Young-Sun),민충식(Min Choong-Siek),강연우(Kang Yeoun-Woo) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.7
Recently, it increases in use of CFT(Concrete filled steel tube, below CFT) because it an excellent internal force and deformation capacity. But, CFT column lose bearing capacity when steel tube is exposed under fire. In case of the Europe, Japan and America, it have been studied the fire-resistance performance of CFT to use actual specimen. Fire resistance performance of CFT column is determined to internal concrete at fire. Therefore, it is able to evaluate mechanical properties at elevated temperature though specimen reduce the scale. In this study, it is experimentally investigated in effects to use CFT Stub Column at elevated temperature. This study is aimed to study the effect of elevated temperatures ranging from 20 to 700℃ on mechanical properties of concrete according to strength of concrete and fiber mixing. Tests were conducted with □75×75×H200 ㎜ CFT Stub Column and Ø100×200 ㎜ cylinder specimens, which compared to that observed at 20℃. As a result, compressive strength decreased at 100℃, rose again at 200~300℃ and decreased over 300℃. But elastic modulus is decreased continually, and there were deferent as intended compressive strength at elevated temperature. Failure mode shows local buckling at a third of length.