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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 $500^{\circ}C$.
고강도 매스콘크리트의 수화지연효과에 따른 수화발열상승속도 및 자기수축의 저감 특성 평가
김규용,구경모,신경수,이의배,강연우,타케우치 토루,Kim, Gyu-Yong,Koo, Kyung-Mo,Shin, Kyoung-Su,Lee, Eui-Bae,Kang, Yeon-Woo,Takeuchi, Tohru 대한건축학회 2011 대한건축학회논문집 Vol.27 No.1
In this study, to reduce the hydration heat velocity of the high-strength mass concrete at early ages, micro encapsuled retarder that could retard cement reaction was applied, and the changes of autogenous shrinkage and the relationship between the hydration temperature and autogenous shrinkage were investigated. In the result of research, the retardation of the cement hydration process by the micro encapsuled retarder leads to an late setting, with no effect on the development of the compressive strength of concrete. The hydration temperature and hydration heat velocity of high-strength mass concrete can be decreased with the use of the micro encapsuled retarder. A close relationship could be found between the hydration temperature and autogenous shrinkage; the higher the hydration heat velocity, the higher the autogenous shrinkage velocity and the greater the ultimate autogenous shrinkage.
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.