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장용헌(Jang Yong-Heon),윤현도(Yun Hyun-Do),차준호(Cha Jun-Ho),최기선(Choi Ki-Sun),유영찬(You Young-Chan),김긍환(Kim Keung-Hwan) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(구조계)
The objective of this study was to investigated the bond Characteristics between recycled aggregate concrete and deformed bars. Bond strength between reinforcing bars and RCA concrete was qualitatively evaluated as a part of continuous studies to establish design code of reinforced concrete structural members using recycled aggregate. For practical application, specimens were manufactured with the ready mix RCA concrete. Parameters investigated include: replacement levels, bar position and bar location. For the pull-out test, each specimen was in the form of a cube, with each side of 150㎜ in length and a deformed bar, 16㎜ in diameter, was embedded in the center of each specimen. Base on the test results, the influences of deformed bars position and location on the bond strength between the recycled aggregate concrete. Test results were compared with the bond strength requirement recommended by CEB-FIP code. The most of HT type specimen with compressive strength showed lower bond strength than the ones provided in CEB-FIP. It was reasoned that bonded area of top bar specimen was reduced at the soffit of reinforcement because of bleed water of fresh concrete. So, only V type and HB specimen satisfied the bond strength requirement recommended by CEB-FIP code.
장용헌 ( Jang Yong-heon ),김윤수 ( Kim Yun-su ),김선우 ( Kim Sun-woo ),최기봉 ( Choi Ki-bong ),윤현도 ( Yun Hyun-do ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.1
Reinforced concrete structures have an excellent durability under a good construction and continuous maintenance. But reinforced concrete construction is influenced by atmospheric phenomena and it is creating a deterioration. One of the deterioration cause on concrete is a freezing and thawing action. Freezing and thawing leads to the reduction in concrete durability by the cracking or surface spalling. If we are carried out freezing and thawing, deterioration of reinforced concrete construction will be reduction. Therefore, this study was performed to investigate the flexural behavior of reinforced concrete beams exposed to freezing and thawing cycles. The presence of damage and cycles were considered as variables in this study.
PET 섬유를 사용한 고인성 시멘트 복합체의 인장거동 특성
장용헌 ( Jang Yong-heon ),전에스더 ( Jeon Esther ),송선화 ( Song Seon-hwa ),박완신 ( Park Wan-shin ),윤현도 ( Yun Hyun-do ) 한국구조물진단유지관리공학회 2007 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.11 No.2
High performance fiber reinforced cementitious composites(HPFRCCs) shows ductile behavior because of the fiber bridging characteristics. In this paper, it was discussed the result of the direct tensile response of HPFRCC with the same volume fraction of fibers. The main variables considered in elude the type of fibers(PET2.0, PET 1.5 + PE0.5, PET1.5 + PVA0.5). As a result, PET 1.5 + PE0.5(pseudo strain-hardening, multiple cracking) are found to be more effective than PET2.0 and PET 1.5 + PVA0.5.
장용헌(Jang Yong-Heon),윤현도(Yun Hyun-Do),이민정(Lee Min-Jung),최기선(Choi Ki-Sun),유영찬(You Young-Chan),이도헌(Lee Do-Heun) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)
The objective of this study was to investigated the bond Characteristics between recycled fine aggregate concrete and deformed bars. Deformed bars position (i.e, vertical, horizontal) and the locations (i.e., 225㎜ and 75㎜) were considered as variable in this paper. Each specimen was in the form of a cube, with edges of 150㎜ in length and for the pull-out tests, a deformed bar, 16㎜ in diameter, was embedded in the center of each specimen. Base on the test results, the influences of deformed bars position on the bond strength between the recycled fine aggregate concrete and the deformed bars were investigated. Test results were compared with the bond strength requirement recommended by CEB-FIP code. It was found that the bond strength between the recycled fine aggregate concrete and deformed bars were influenced by both recycled fine aggregate concrete replacement ratios and positions of deformed bars. The reduction of bonded area at the soffit of horizontal reinforcement caused by concrete bleeding was observed in H type specimen. So, only V type and HB specimen satisfied the bond strength requirement recommended by CEB-FIP code.
동결융해를 경험한 SHCCs로 보강된 콘크리트의 역학적 특성
김윤수(Kim Yun-Su),장용헌(Jang Yong-Heon),장광수(Jang Gwang-Su),김선우(Kim Sun-Woo),전에스더(Jeon Esther),윤현도(Yun Hyun-Do) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)
A number of recent studies have indicated that strain hardening cement composites (SHCCs), defined by an ultimate tensile strength higher than the first cracking strength and the formation of multiple cracking during the deformation process, show promise in serving as excellent repair and strengthening materials for concrete structures. Environmental durability is essential for these materials. This paper present the result of an experimental investigation into the effects of freeze-thaw cycles on four point bending test of reinforced concrete with hybrid fiber. Two type of SHCCs, reinforced with PVE0.75%+PE0.75%, PVA1.3%+PE0.2%, respectively, were subjected to 0 and 300 freezing and thawing cycling. The test result freezing and thawing cycling up to 300cycles does not appear to significant affect the bending stress.