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김이성,윤요현,김화중 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)
The purpose performance degradation of concrete structures is generally caused by deteriorations, such as surface collapse, pop-out, crack, and so on. It may result in serious defects of the concrete structures. Thus it is very important 세 detect and repair the defects of concrete structures within a proper time to assure the structural safety. However, the defects due to the deteriorations are usually difficult to find by visual inspection. A sensor is developed in this study, which may give early indication for degradation of concrete structures and show the location of the damage. Cracks can be defected by the liquid in a small glass capsules which are embedded in the concrete structures. This paper discusses the applicability of that was developed smart concrete.
김이성,성원경,김화중 대한건축학회 2005 大韓建築學會論文集 : 構造系 Vol.21 No.3
Various structural materials have been used in construction projects using stones, concretes, and steels materials. Among of these projects, concretes may use widely because concretes have high compressive strength, and comparatively easy maintenance and management. Reinforced concrete Buildings will be deteriorated as time passed. These problems will be accelerated by propagation of cracks. In order to manage such cracks, time, efforts and expense are required. In this study, leakages of fluorescence and adhesive material were investigated using glass sensors that were embedded in a model beam and column. In addition, currents in glass pipe sensor were observed to find leakage of liquid in glass pipes. Progressive cracks were generated by fracture of glass pipe sensor. In this investigation, a reinforcement clothing system was wrapped for a glass pipe sensor. The glass pipe sensor that can make control and reinforce cracks simultaneously.
김이성,윤종문,김화중 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2
The R.C building will be superannuated if time passes. This cause is generated by propagation of a crack. In order to notice such a crack, time and efforts, expense, etc, that have exhausted. Various technologies were developed to improve its properties related to strength and workability during construction. Performance degradation of concrete structures is generally caused by the deteriorations, such as surface collapse, pop-out, crack, and so on. The deterioration mechanism of concrete is very complex. Detection of the degradation and fracture inside of concrete is also very difficult. A method to detect or cure the concrete crack have been developed in this study. They are by using small glass-pipe sensors. Experimental study shows good performance for detecting crack(small glass-pipe sensors) inside of the concrete.
성원경,김이성,김화중 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)
Various structural materials have been used in construction projects using stones, concretes, and steels materials. Among of these projects, concretes may use widely because concretes have high compressive strength, and comparatively easy maintenance and management. Reinforced concrete Buildings will be deteriorated as time passed. These problems will be accelerated by propagation of cracks. In order to manage such cracks, time, efforts and expense are required. In this study, leakages of fluorescence and adhesive material were investigated using glass sensors that were embedded in a model beam and column. In addition, currents in glass pipe sensor were observed to find leakage of liquid in glass pipes. Progressive cracks were generated by fracture of glass pipe sensor. In this investigation, a reinforcement clothing system was wrapped for a glass pipe sensor. The glass pipe sensor that can make control and reinforce cracks simultaneously.
고온에서 콘크리트의 배합특성 변화에 따른 열전도율에 관한 실험 연구
이영생,김이성,김화중 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)
A structure is performed the result currently by becoming high-storied building, a large size, and multi-function gradually recently as a method proposal of correspondence by centralization of an institution and institution centralization of city population. Moreover, it is a fact that a building also increases the fire outbreak danger by this proportionally high-storied building and by being enlarged and going Therefore, in this research, when adding high temperature to concrete, the thermal conductivity of physical-properties by time elapes tend to be drawn through an experiment, and it is going to examine the relation
최영화,김이성 대구대학교 특수교육재활과학연구소 2010 産業技術硏究 Vol.21 No.1
The theory of wave propagation uses mathematical theories including functional analysis, probability differential equation and numerical analysis, and this is mathematically based on the wave propagation phenomenon occurring in random media. Acoustic equation, Maxwell equation and Elastic equation, etc, are used as equations of mathematical model. When the damage and strength of main elements and structures are tested using acoustic emission, detection may be impossible depending on the size of the specimen, the smoothness of the surface, the complexity of the shape, the direction of the defect, and the arrangement of the steel bars, among others. In addition, detection is also difficult when these are relating problems to the internal crystal grain size pore, segregation, as well as foreign matter. Many problems also arise from the attachment of sensors to the specimen for using the direct-contact method
원심력 성형을 위한 폴리머 경계블록의 배합 결정에 대한 실험 연구
장주영,윤종문,김이성,김화중 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)
Process of the Concrete waste is recently become gradually for difficult environment and other problems. Because it cannot search for reclaiming place for remnant of re-development buldings, the pending development project was broken out. But, concrete waste have a various recycling method and fixing the environment problem. Use of Unsaturated Polyester resin is better than cement on a strength and durability. Also, use of a centrifugar force in forming process is expected more effective viewed in a durability against environment influence. Therfore, the purpose of this study seek for proper proportion through a prior experiment to make curbs with recycling aggregation and sludge from concrete waste. Then it apply to centrifugar force mold. The experimental mixing proportion was planned to acquire of a optimum workability and filling capability of resin mortar mixed with using the recycled aggregate.
김형준(Kim Hyung-Jun),김용주(Kim Yong-Ju),김이성(Kim Ie-Sung),김화중(Kim Wha-Jung) 한국구조물진단유지관리학회 2004 한국구조물진단학회 학술발표회논문집 Vol.- No.-
Concrete are brittle materials and they are which come to brittle fracture rapidly by progress of cracks Therefore, what the time for repairing the damage portion is understands Importantly by such cracks When they happened, the glass pipe similar to concrete was used Such a glass pipe can iosert repair material In an inside, or can use It by Switch They are interested in the crack monitoring of structure using FM radio sensor In this study, the monitoring to a crack was studied using FM radio sensor If load IS received In specimen of the center, glass tube pipe switches will be destroyed in inside concrete And, In FM radio sensors connected with glass tube pipe switches, they come to send a signal In addition, If a signal is received In a part receiver, there is a function to telling a sound Using these properties, they are able to monitor about load conditions and displacement m structure This study IS fundamental research for developing the smart concrete that tells this by sound and the signal externally at the time of damage generating