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고강도 매스콘크리트의 수화지연효과에 따른 수화발열상승속도 및 자기수축의 저감 특성 평가
김규용,구경모,신경수,이의배,강연우,타케우치 토루,Kim, Gyu-Yong,Koo, Kyung-Mo,Shin, Kyoung-Su,Lee, Eui-Bae,Kang, Yeon-Woo,Takeuchi, Tohru 대한건축학회 2011 대한건축학회논문집 Vol.27 No.1
In this study, to reduce the hydration heat velocity of the high-strength mass concrete at early ages, micro encapsuled retarder that could retard cement reaction was applied, and the changes of autogenous shrinkage and the relationship between the hydration temperature and autogenous shrinkage were investigated. In the result of research, the retardation of the cement hydration process by the micro encapsuled retarder leads to an late setting, with no effect on the development of the compressive strength of concrete. The hydration temperature and hydration heat velocity of high-strength mass concrete can be decreased with the use of the micro encapsuled retarder. A close relationship could be found between the hydration temperature and autogenous shrinkage; the higher the hydration heat velocity, the higher the autogenous shrinkage velocity and the greater the ultimate autogenous shrinkage.
고강도콘크리트를 충전한 CFT 기둥의 내화성능 평가에 관한 실험적 연구
김규용(Kim Gyu-Yong),김영선(Kim Young-Sun),이태규(Lee Tae-Gyu),강선종(Kang Sun-Jong),김무한(Kim Moo-Han) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.8
CFT(Concrete filled steel tube, below CFT) is an excellent internal force and deformation capacity. But it is difficult to evaluate the fire resistant performance of the CFT. Because two main materials such as steel tube and concrete are combined as one. Also, the case of high strength CFT is feared that spalling occur inside. In this study, types of CFT(column) specimens were four factors which were strength of concrete, slenderness ratio of steel tube, fiber using, fire protective coating and then CFT(column) specimens were exposed to heating controlled as closely as possible the ISO-834 standard fire curve. Also, test results tried to analyze internal temperature through nonlinear transient heat flow analysis. Test results showed relative values of CFT specimens and analysis but surface parts were excessive values of analysis. Moreover, fire-resist design of CFT column comes to the conclusion that is sufficient consideration. Because results tend to indicate different properties.
하중조건에 따른 보통 및 애쉬 및 점토계 경량골재 콘크리트의 열팽창변형
김규용(Kim Gyu-Yong),이태규(Lee Tae-Gyu),최경철(Choe Gyeong-Cheol),남정수(Nam Jeong-Soo),강연우(Kang Yeoun-Woo) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.5
In case of concrete, it should be deformed by many factors such as explosive spalling, thermal strain and creep at high temperature. structural fire design have been proposed to predict fire damage as national standard. It is general safer to use values obtained from tests of unstressed residual test in stead of stressed test. But most of thermal properties on concrete was conducted with normal aggregate. In this study, test was conducted to evaluate stressed effect concerning normal weight and light weight concrete of 60㎫. Our experimental procedure was based on RILEM recommendation. Loading level was 0, 20 and 40 percent of compressive strength at room temperature. And thermal strain properties of concrete was carried out by 100, 200, 300, 500 and 700℃. Also, results can be analyzed as compare thermal strain properties at elevated temperature with CEN and CEB code.
고온가열에 의한 CFT Stub Column의 역학적 특성평가
김규용(Kim Gyu-Yong),이태규(Lee Tae-Gyu),김영선(Kim Young-Sun),민충식(Min Choong-Siek),강연우(Kang Yeoun-Woo) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.7
Recently, it increases in use of CFT(Concrete filled steel tube, below CFT) because it an excellent internal force and deformation capacity. But, CFT column lose bearing capacity when steel tube is exposed under fire. In case of the Europe, Japan and America, it have been studied the fire-resistance performance of CFT to use actual specimen. Fire resistance performance of CFT column is determined to internal concrete at fire. Therefore, it is able to evaluate mechanical properties at elevated temperature though specimen reduce the scale. In this study, it is experimentally investigated in effects to use CFT Stub Column at elevated temperature. This study is aimed to study the effect of elevated temperatures ranging from 20 to 700℃ on mechanical properties of concrete according to strength of concrete and fiber mixing. Tests were conducted with □75×75×H200 ㎜ CFT Stub Column and Ø100×200 ㎜ cylinder specimens, which compared to that observed at 20℃. As a result, compressive strength decreased at 100℃, rose again at 200~300℃ and decreased over 300℃. But elastic modulus is decreased continually, and there were deferent as intended compressive strength at elevated temperature. Failure mode shows local buckling at a third of length.
고강도 매스콘크리트의 수화지연효과에 따른 수화발열상승속도 및 자기수축의 저감 특성 평가
김규용(Kim Gyu-Yong),구경모(Koo Kyung-Mo),신경수(Shin Kyoung-Su),이의배(Lee Eui-Bae),강연우(Kang Yeon-Woo),竹內徹(Tohru Takeuchi) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.1
In this study, to reduce the hydration heat velocity of the high-strength mass concrete at early ages, micro encapsuled retarder that could retard cement reaction was applied, and the changes of autogenous shrinkage and the relationship between the hydration temperature and autogenous shrinkage were investigated. In the result of research, the retardation of the cement hydration process by the micro encapsuled retarder leads to an late setting, with no effect on the development of the compressive strength of concrete. The hydration temperature and hydration heat velocity of high-strength mass concrete can be decreased with the use of the micro encapsuled retarder. A close relationship could be found between the hydration temperature and autogenous shrinkage; the higher the hydration heat velocity, the higher the autogenous shrinkage velocity and the greater the ultimate autogenous shrinkage.
기존 철근콘크리트조 아파트의 노早도 평가에 의한 내구성 및 내구수명 검토에 관한 연구
김규용 ( Kim Gyu-yong ),강석표 ( Kang Suk-puo ),권영진 ( Kwon Young-jin ),정민희 ( Jung Min-hee ),고진수 ( Ko Jin-soo ),송병창 ( Song Byung-chang ),김무한 ( Kim Moo-han ) 한국구조물진단유지관리공학회 1998 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.2 No.2
The results of the prediction on remaining life by using cover depth and carbonation velocity and the application to evaluation system of deterioration by using non-destructive method and destructive method intended for the exiting reinforced concrete apartment which has been built for 18 years in Tae-Jeon are as follow. - It is found out that the formula of carbonation velocity is X=0.319√t in outdoor, X=0.574√t in indoor, X=0.323√t in basement. Therefore, the carbonation velocity of indoor is faster than that of Kishitani, which is X=0.372√t(w=0.6, R=1), but the carbonation velocity in outdoor and basement is similar to that in Kishitani. - As the result of the remaining-life investigation on the reinforced concrete apartment, the probability of reinforcing-steel corrosion is over 15% in indoor, outdoor and basement when it have been about 50 years therefore the remaining life of the examined apartment is semipermanent.
강영태 ( Kang Young-tai ),김규용 ( Kim Gyu-yong ),이보경 ( Lee Bo-kyeong ),이상규 ( Lee Sang-kyu ),김경태 ( Kim Gyeong-tae ),남정수 ( Nam Jeong-soo ) 한국건축시공학회 2017 한국건축시공학회 학술발표대회 논문집 Vol.17 No.2
In this study, the flexural behavior of fiber-reinforced concrete by fiber type were evaluated. As a result, the flexural strength of the hooked steel fiber-reinforced concrete(HSFRC) was lower than that of the amorphous metallic fiber reinforced concrete(AFRC), however it was shown strain-softening behavior by the pull-out of fiber. The flexural strength and the equivalent flexural strength of polyamide fiber-reinforced concrete(PAFRC) were lower than other specimens, but the equivalent flexural strength ratio was similar to that of AFRC. The flexural behavior of the fiber-reinforced concrete was associated with the bonding and pull-out properties of the fiber and matrix depending on the fiber type.
OPC의 분말도 및 SO<sub>3</sub> 함량이 시멘트 광물계 급결제를 사용한 숏크리트 결합재 물성에 미치는 영향
강봉희,김규용,최재원,구경모,황봉춘,Kang, Bong-Hee,Kim, Gyu-Yong,Choi, Jae-Won,Koo, Kyung-Mo,Hwang, Bong-Choon 한국구조물진단유지관리공학회 2020 한국구조물진단유지관리공학회 논문집 Vol.24 No.2
숏크리트용 콘크리트는 일반적으로 1종 보통 포틀랜드시멘트(이하 OPC)를 100% 사용한 레미콘 제품에 현장에서 별도로 숏크리트용 급결제를 약 5% 혼합하는 방식으로 사용된다. 본 연구에서는 국내에서 사용률이 높은 시멘트 광물계 급결제(calcium aluminate)를 사용한 숏크리트용 결합재로서 OPC의 분말도 및 SO<sub>3</sub> 함량이 모르타르 관입저항 및 압축강도, 페이스트 수화물 및 공극구조에 미치는 영향을 시험 및 분석하여 재령별 수화물의 생성량과 공극구조가 숏크리트의 모르타르 성능에 미치는 영향을 파악하였다. 향후 숏크리트용 결합재로서 최적화된 OPC를 제조하는데 활용할 수 있을 것으로 기대된다. Shotcrete concrete is generally used in the form of ready-mixed concrete products using type I ordinary portland cement(hereinafter referred to as OPC) and about 5% of accelerator mixed separately in the field. In this study, we tested the effect of OPC fineness and SO<sub>3</sub> content on a penetration resistance, compressive strength of binder for shotcrete using calcium aluminate type accerlerator. And we analysed hydrates and pore structure effects on mortar performance. In the future, it is expected to be useful for manufacturing optimized OPC as a binder for shotcrete.
비정질 강섬유보강 시멘트복합체의 정역학특성 및 내충격성능 평가를 통한 구조물 적용 가능성 검토
강일수 ( Kang Il-soo ),김규용 ( Kim Gyu-yong ),이보경 ( Lee Bo-kyeong ),이상규 ( Lee Sang-kyu ),손민재 ( Son Min-jae ),남정수 ( Nam Jeong-soo ) 한국건축시공학회 2017 한국건축시공학회 학술발표대회 논문집 Vol.17 No.2
This study examined the effect that the amorphous metallic fibers had on the static mechanical properties and the impact resistance of cement composites to those of hooked steel fibers. The hooked steel fiber exhibited pull-out from the matrix after the peak flexural stress was attained, while the amorphous metallic fiber was not pulled out from the matrix, but was instead cut off. In terms of impact resistance, the amorphous metallic fiber reinforced cement composite was found to be more effective at resisting cracking than the hooked steel fiber reinforced cement composite. Therefore, amorphous metallic fiber should be used in fiber reinforced cement composite materials, and for structural materials, and for protection panels.
염해를 입은 구조물의 내구성 향상을 위한 도포형 방청재의 이용 기술 개발
강석표 ( Kang Suk-puo ),김규용 ( Kim Gyu-yong ),권영진 ( Kwon Young-jin ),곽영준 ( Kwak Young-jun ),김무한 ( Kim Moo-han ) 한국구조물진단유지관리공학회 1997 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.1 No.1
Concrete structures are damaged by the corrosion of reinforcing bars due to chlorides in concrete, when sea sand is used in concrete, or when concrete structure is located at near by the coastline. Therefore, it is the aim of this study to develop the technic of using coating type corrosion inhibitor to improve durability of salt damaged concrete and to fix this repair method in our country.