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3가지 방안을 이용한 콘크리트 초기재령특성 비교측정 연구
장일영 ( Jang Il-young ),운영위 ( Yun Ying-wei ),김성겸 ( Kim Seong-kyum ),이강득 ( Lee Kang-deuk ),손창호 ( Son Chang-ho ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.1
The uneven shrinkage strain during concrete hardening period is one of the main causes for structure cracking. Therefore, shrinkage monitoring during concrete early age is significant for controlling inner strain distribution by improving curing process, thereby ensuring the quality and safety of whole structures. In this paper, three different methods including using FBG embedded strain sensors with different temperature compensation technique (FBG temperature sensor or thermocouple) and KM embedded strain gauges are used to monitor concrete shrinkage during early age. The experiment results show that all the used method successfully grasp the early age shrinkage of concrete. And quality comparison among these three methods has been analyzed.
3가지 방안을 이용한 콘크리트 초기재령특성 비교측정 연구
장일영(Jang, Il-Young),운영위(Yun, Ying-Wei),김성겸(Kim, Seong-Kyum),이강득(Lee, Kang-Deuk),손창호(Son, Chang-Ho) 한국구조물진단유지관리학회 2009 한국구조물진단학회 학술발표회논문집 Vol.2009 No.1
The uneven shrinkage strain during concrete hardening period is one of the main causes for structure cracking. Therefore, shrinkage monitoring during concrete early age is significant for controlling inner strain distribution by improving curing process, thereby ensuring the quality and safety of whole structures. In this paper, three different methods including using FBG embedded strain sensors with different temperature compensation technique (FBG temperature sensor or thermocouple) and KM embedded strain gauges are used to monitor concrete shrinkage during early age. The experiment results show that all the used method successfully grasp the early age shrinkage of concrete. And quality comparison among these three methods has been analyzed.
류근걸 ( Kun Kul Ryo ),하미영 ( Mi-young Ha ),이강득 ( Kang Deuk Lee ) 대한금속재료학회(구 대한금속학회) 2016 대한금속·재료학회지 Vol.54 No.9
Micro-twinning has been investigated in some state-of-the-art materials by transmission electron microscopy, but such characterizations have not been clear so far. Micro-twins must be characterized by identifying their spots in the electron diffraction pattern, which is very unique compared to normal defects such as dislocations or stacking faults. In this study the electron diffraction pattern which should be developed by micro-twins was derived theoretically for the [011] beam direction assuming that the symmetrical mirror plane was {112}. The angles between the diffraction spots of the (200) and (111) planes were concluded to be 15.7°. This conclusion could be utilized as an indicator of the likely offset of crystal rotations or stress relaxations due to micro-twinning formation. The presence of micro-twinning should also be confirmed, by making sure that twin spots appear in the diffraction patterns and micro-twin images in dark field.(Received December 29, 2015; Accepted March 20, 2016)
기초접합부의 PC기둥 보강을 통한 기초의 뚫림 전단강도에 관한 실험적 연구
장일영 ( Jang Il-young ),박훈규 ( Park Hoon-gyu ),장진혁 ( Jang Jin-hyuk ),김영근 ( Kim Young-geun ),이강득 ( Lee Kang-deuk ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.2
Recently, the increasement of the foundation thickness is inevitable due to appearance of skyscraper. Technology which is used to solve this new problem by reducing the foundation thickness should be studied. This research is an experimental study on the punching shear of foundation-column connections using precast concrete column with steel base plate for thickness reduction of foundation.
기초접합부의 PC기둥 보강을 통한 기초의 뚫림 전단강도에 관한 실험적 연구
장일영(Jang, Il-young),박훈규(Park, Hoon-Gyu),장진혁(Jang, Jin-Hyuk),김영근(Kim, Young-Geun),이강득(Lee, Kang-Deuk) 한국구조물진단유지관리학회 2009 한국구조물진단학회 학술발표회논문집 Vol.2009 No.2
Recently, the increasement of the foundation thickness is inevitable due to appearance of skyscraper. Technology which is used to solve this new problem by reducing the foundation thickness should be studied. This research is an experimental study on the punching shear of foundation-column connections using precast concrete column with steel base plate for thickness reduction of foundation.