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섬유를 혼입한 고강도 내화콘크리트의 크리프 특성에 관한 실험적 연구
배연기(Bae Yeoun-Ki),이진우(Lee Jin-Woo),박희곤(Park Hee-Gon),윤광섭(Youn Kwang-Sup),이한승(Lee Han-Seung),이재삼(Lee Jae-Sam) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(구조계)
In the recent years, the high strength concrete has increasingly been used according to extending market of tall buildings. However, Ministry of Land, transport and Maritime Affairs was established by law with an alternative plan after June 2008 because of the weakness of high strength concrete accompanied spalling phenomena in fire. The mix design of concrete has to properly meet standards which are the spalling resistance of concrete and limited temperature of steel reinforcement. The fire proof concrete mixed fiber has widely been used to meet spalling safety on the many construction sites, the most researches about the fire proof concrete mixed fiber had being carried out focused on fire resistance, compressive strength and cast in place of concrete. But the most important thing is column shortening used the fire proof concrete within the vertical members. In this paper, the fire proof concrete filled spalling safety standards was experimented by required material when the column shortening is revised between normal concrete and fire proof concrete mixed fiber and then the results have done a comparative analysis. Also, The paper aimed to indicate a basic data for revision of column shortening of fire proof concrete.
배연기(Bae Yeoun-Ki),김유진(Kim Yoo-Jin),이진우(Lee Jin-Woo),박희곤(Park Hee-Gon),이재삼(Lee Jae-Sam),이한승(Lee Han-Seung) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)
In order to lower the hydration heat of high strength mass concrete and to improve its setting method, concrete using three component system and concrete using low heat cement are mainly used in terms of material, and pre cooling, pipe cooling, block placement, etc. are used in terms of working method. In consideration of the extension of construction period and economic efficiency, however, it is considered somewhat more desirable to control hydration heat in the aspect of material rather than applying various methods in the aspect of working. In the aspect of material, for high strength mass concrete, we need to examine not only the control of hydration heat as in ordinary mass concrete but also the increase of viscosity through high strength and the placement method. In addition, it is considered desirable to increase the amount of admixture through two component system and three component system concrete, which is low heat concrete generally applied to mass concrete, and to control hydration heat by minimizing the mass of powder to be used by using high performance AE water reducing agent. However, when raw materials such as cement, slag powder and fly ash are simply mixed using a ready mixed concrete car, there can be the problem that the homogeneity and viscosity of concrete increase. In order to solve this problem, the use of low heat blended cement is increasing. Thus, the present study purposed to compare the basic physical properties, hydration heat and compressive strength of three component system low heat concrete produced through mixing raw materials by ready mixed concrete companies and concrete using low heat blended cement produced by cement companies, and to present basic information for the field application of high strength mass concrete.
콘크리트 규격 및 압송압에 따른 마찰계수 변화경향에 대한 실험적 연구
권해원 ( Hae Won Kwon ),배연기 ( Yeoun Ki Bae ),이재삼 ( Jae Sam Lee ),김석일 ( Seog Il Kim ),김현섭 ( Hyun Seob Kim ),이종서 ( Jong Seo Lee ) 한국건축시공학회 2009 한국건축시공학회 학술발표대회 논문집 Vol.9 No.1
Plan of concrete pumpability test or the theoretical character knowledge in the mechanic is become accomplished with character. But the character knowledge of the concrete is not considered appropriately. The theoretical background and assumed fact is a little different representative characteristic of the concrete. Concrete pumping experiment result it leads consequently and is produced the coefficient of friction which in concrete type and sending in more pressure it follows changes must grasp the tendency which. But until currently the majority experiment and research did not pass by this process. Grasps the coefficient of friction change tendency which it follows in concrete type and when pumping concrete more pressure data fundamentally from the experimental research which it sees consequently under providing the man with underdeveloped genital organ.
PP 및 PVA 섬유를 혼입한 고성능 RC 기둥의 폭열 방지 특성
허영선(Heo Yoong-Sun),김기훈(Kim Ki-Hoon),배연기(Bae yeoun-Ki),지석원(Jee Suk-Won),이성연(Lee Seong-Yeun),한천구(Han Cheon-Goo) 한국구조물진단유지관리학회 2005 한국구조물진단학회 학술발표회논문집 Vol.- No.-
This study investigates performance of fire resistance of HPC with the contents of polypropylene(PP) and polyvinyl alcohol(PVA) fiber, respectively. The experimental results shows that increase of fiber contents, regardless of fire type, exhibited low fluidity and air contents. In the case of compressive strength, on the other hand, all specimen had more than 50MPa of compressive strength. For the properties of spalling appearance, serious spalling failure occurs with plain concrete, which caused exposure of re-bar, while HPC containing fiber had favorable prevention of spalling. Residual compressive strength maintained more than 70% of original strength, regardless of fiber contents,
PP 및 PVA 섬유를 혼입한 고성능 RC 기둥의 폭열 방지 특성
허영선 ( Heo Young-sun ),김기훈 ( Kim Ki-hoon ),배연기 ( Bae Yeoun-ki ),지석원 ( Jee Suk-won ),이성연 ( Lee Seong-yeun ),한천구 ( Han Cheon-goo ) 한국구조물진단유지관리공학회 2005 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.9 No.1
This study investigates performance of fire resistance of HPC with the contents of polypropylene(PP) and polyvinyl alcohol(PVA) fiber, respectively. The experimental results shows that increase of fiber contents, regardless of fiber type, exhibited low fluidity and air contents. In the case of compressive strength, on the other hand, all specimen had more than 50MPa of compressive strength. For the properties of spalling appearance, serious spalling failure occurs with plain concrete, which caused exposure of re-bar, while HPC containing fiber had favorable prevention of spalling. Residual compressive strength maintained more than 70 % of original strength, regardless of fiber contents.