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증기양생을 실시한 고강도 매스 콘크리트의 온도특성에 관한 실험적 연구
박흥이(Park Heung-Lee),김성진(Kim Sung-jin),백민수(Paik Min-su),이회근(Lee Hoi-keun),이승훈(Seung-Hoon Park),박병근(Park Byung-Keun),정상진(Jung Sang-Jin) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
As architectures have recently become high-risers and megastructured, stable high strength products have been ensured. Accordingly, use of precast concrete accouplement has been increased in order to facilitate air compression and rationalize construction. Since not only external heating but also internal temperature rise caused by the accumulation of cement hydration heat in manufacturing process, precast concrete members with large cross-section used for high-rise mega-structure's columns and beams may exhibit different temperature history compared to the precast concrete members for wall and sub-floor with relatively small cross-sections. Therefore, this study aims to elucidate the characteristics of temperature history of mass concrete members cast with high-strength concrete for precast concrete application. In this study, large cross-sectional precast concrete mock-up, unit cement quantity, and temperature histories in manufacturing precast concrete member under different curing condition were inclusively investigated.
시멘트 종류 및 양생조건을 변화시킨 프리캐스트 고강도 콘크리트의 강도특성에 관한 연구
박흥이(Park Heung-Lee),김성진(Kim Sung-Jin),백민수(Paik Min-Su),이회근(Lee Hoi-Keun),박병근(Park Byung-Keun),정상진(Jung Sang-Jin) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.8
Recently, as architectural concrete structures become high-rise and megastructured, concrete become high-strengthened and, by ensuring products of more stability, and rationalization of construction are required. large cross-sectional precast concrete members such as columns show large temperature increase in manufacturing process not only by external heating but also by concrete itself's hydration heating. Therefore, it is expected that specimen for management to predict strength and compression strength of precast concrete member shows different strength characteristics. Concerning this, in order to suggest strength characteristics of high strength mass concrete suitable for precast concrete application, this study comprises the inclusive investigations on the relations between core strength and the strength characteristics per member cross-section dimensional value and per water-bonding material ratio value.
Fe-22Cr-5Al-X(X=Zr,Y)합금의 고온 부식거동에 관한 연구
이병우,박흥일,김중선,이광학,김흥식,Lee, Byeong-U,Park, Heung-Il,Kim, Jung-Seon,Lee, Gwang-Hak,Kim, Heung-Sik 한국재료학회 1997 한국재료학회지 Vol.7 No.10
Fe-22Cr-5AI-X(X=Zr, Y)합금을 1143K, 고온 황화(P$s_{2}$=1.11x$10^{-7}$atm, P$O_{s}$ =3.11x$10^{-20atm}$) 및 황화/산화 (P$s_{2}$=8.31x$10^{-8}$atm, P$O_{s}$ =3.31x$10^{-18atm}$) 환경의 복합가스 분위기에서 1-30시간동안 노출하여 합금표면에 형성된 부식층을 관찰하여 SEM/EDS로 분석하였다. Fe-22Cr-5AI합금은 고온 부식환경에서 부식 생성물의 성장은 포물선법칙을 따르고 주요 성분은 결함이 많고 다공질인 철과 크롬의 황화물[(Fe, Cr)Sx]이므로 고온 내식성이 감소하였다. Zr을 1wt%첨가한 Fe-22Cr-5AI합금의 고온 부식거동은 Y을 1wt%첨가한 합금과 비슷한 거동을 나타내었다. 황화환경에서는 Cr의 선택 황화에 의한 크롬 황화물(CrS)이 생성되고 노출시간의 경과에 따라 (Fe, Cr)Sx나 (Cr, Fe)Sx 등의 황화물의 성장으로 고온 내식성이 감소하였다. 그러나 황화/산화환경에서는 초기에는 알루미늄산화물(A $I_{2}$ $O_{3}$)및 지르코늄산화물(Zr $O_{2}$)등이 생성되어 보호적이었으나 15시간이후 부터 (Fe, Cr)Sx나 (Cr, Fe)Sx 의 황화물의 성장으로 고온 내식성이 감소하였다.
시멘트 종류를 변화시킨 프리캐스트 고강도 콘크리트의 온도특성에 관한 실험적 연구
김성진(Kim Sung-Jin),박흥이(Park Heung-Lee),박현(Park Hyun),이승훈(Lee Seung-Hoon),박병근(Park Byung-Keun),정상진(Jung Sang-Jin) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.8
As architectures have recently become high-risers and mega-structured, stable high strength products have been ensured. Accordingly, use of precast concrete accouplement has been increased in order to facilitate air compression and rationalize construction. Since external rising by the steam heating and internal rising by the accumulation of cement hydration heat for the temperature of members, precast concrete members with large cross-section used for high-rise mega-structure's columns and beams may exhibit different temperature history compared to the precast concrete members for wall and sub-floor with relatively small cross-sections. Therefore, this study aims to elucidate the characteristics of temperature history of mass concrete members cast with high-strength concrete for precast concrete application. In this study, large cross-sectional precast concrete mock-up, unit cement quantity, and temperature histories in manufacturing precast concrete member under different curing condition were inclusively investigated. Consequently this research is about the factors of different hydration temperature between the test specimen, typically used in strength management method of concrete, and the mock-up model. We could find that it has a different face. The highest temperature, temperature increment and gradient.
증기양생을 실시한 고강도 매스 콘크리트의 온도특성에 관한 실험적 연구
김성진(Kim Sung-Jin),박흥이(Park Heung-Lee),백민수(Paik Min-Su),이회근(Lee Hoi-Keun),박병근(Park Byung-Keun),정상진(Jung Sang-Jin) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.10
As architectures have recently become high-risers and megastructured, stable high strength products have been ensured. Accordingly, use of precast concrete accouplement has been increased in order to facilitate air compression and rationalize construction. Since not only external heating but also internal temperature rise caused by the accumulation of cement hydration heat in manufacturing process, precast concrete members with large cross-section used for high-rise mega-structure's columns and beams may exhibit different temperature history compared to the precast concrete members for wall and sub-floor with relatively small cross-sections. Therefore, this study aims to elucidate the characteristics of temperature history of mass concrete members cast with high-strength concrete for precast concrete application. In this study, large cross-sectional precast concrete mock-up, unit cement quantity, and temperature histories in manufacturing precast concrete member under different curing condition were inclusively investigated.