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정행철(Jung Hang-Chul),임홍철(Rhim Hong-Chul),우상균(Woo Sang-Kyun),송영철(Song Young-Chul) 한국구조물진단유지관리학회 2004 한국구조물진단학회 학술발표회논문집 Vol.- No.-
Among possible NDT techniques, microwave method is proven to be effective in fast and non-contact Inspection of concrete structures and inclusions inside concrete. It is also found that the microwave method has a potential in detecting debonding between fiber reinforced polymer (FRP) plate and concrete In this paper, the research work needed for the development of a reliable microwave method are studied in actual measurements of concrete specimens reinforced with FRP. Concrete specimens are made with FRP and artificial delamination inside. A microwave measurement system With horn antenna with !ugh center frequency and broad frequency bandwidth are used to image inside concrete specimens for the detection of debonding between concrete and FRP and measurement results are analyzed
정행철 ( Jung Hang-chul ),임홍철 ( Rhim Hong-chul ),우상균 ( Woo Sang-kyun ),송영철 ( Song Young-chul ) 한국구조물진단유지관리공학회 2004 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.8 No.2
Among possible NDT techniques, microwave method is proven to be effective in fast and non-contact inspection of concrete structures and inclusions inside concrete. It is also found that the microwave method has a potential in detecting debonding between fiber reinforced polymer (FRP) plate and concrete. In this paper, the research work needed for the development of a reliable microwave method are studied in actual measurements of concrete specimens reinforced with FRP. Concrete specimens are made with FRP and artificial delamination inside. A microwave measurement system with horn antenna with high center frequency and broad frequency bandwidth are used to image inside concrete specimens for the detection of debonding between concrete and FRP and measurement results are analyzed.
수화열 해석을 통한 매트기초의 양생방법에 관한 해석적 연구
이원동(Lee Won-Dong),지남용(Jee Nam-Yong),박기봉(Park Ki-Bong),정행철(Jung hang-Chul),강대훈(Kang Dae-Hun) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
Recently, the technique of mass concrete has been used on construction site By high-rise building and large sized building. Mass concrete occurs a temperature stress by heat of hydration. It cause for a temperature crack. It used many methods for reducing a temperature crack because a temperature crack affects to reduce the strength and durability of concrete. In the examination of occurring the generation of a temperature cracking, it needs the evaluation of thermal cracking index. Therefore this study shows properly curing method of mat foundation for reducing a temperature cracking with the thermal cracking index. For them, it tried to analyze internal temperature and thelmal cracking index based on the thickness of concrete and curing method.
3성분계 시멘트를 사용한 매스콘크리트의 내부온도 특성에 관한 실험적 연구
김연승(Kim Yeon-Seung),지남용(Jee Nam-Yong),박기봉(Park Ki-Bong),정행철(Jung Hang-Chul),강대훈(Kang Dae-Hun) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
The thermal stress in mass concrete, which is accumulated heat of hydration at initial curing, is originated because of the temperature variation between internal and surface of concrete. It may be increased possibility of temperature crack by unequable deformation between internal and surface of concrete. There is the report that the concrete used mainly by cement blended with flyash and blast furnace slag can decrease the maximum temperature of internal part. As a result, ternary system cement can be expected to reduce heat of hydration. Therefore, the characteristics of internal temperature is summarized by measuring temperature distribution, the time having the maximum temperature, and the maximum internal temperature of concrete, with the target on the mat foundation of residential-commercial complex building of "H" site in Busan and with blending flyash and blast furnace slag as binders. Finally, reducing effect of hydration heat of concrete used ternary system cement is analyzed, compared with the exhausted study on internal temperature properties of concrete used binary system cement.