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PP섬유 혼입 및 횡구속재 변화에 따른 고성능 콘크리트의 폭열방지에 관한 실험적 연구
황인성 ( Hwang¸ Yin-seong ),이백수 ( Li¸ Bai-shou ),이병열 ( Lee¸ Byung-yul ),양성환 ( Yang¸ Seong-hwan ),한천구 ( Han¸ Cheon-goo ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.1
This study is an experimental study on the spalling resistance of high performance concrete with PP fiber contents and material for lateral confinement. According to the results, spalling occurs to all specimens that do not contain PP fiber and it is prevented in the specimens containing PP fiber by more than 0.05% after heating, so it shows good effect on the spalling resistance. Variation of material kind for lateral confinement, metal lath shows the best effect on spalling resistance, and glass fiber and carbon fiber do not show good effect on the spalling resistance due to reduction of bond strength by high temperature. While the residual compressive strength shows about 80% of its original strength in the specimen confined laterally by PP fiber contents and metal lath, it decreases a bit in the range of 50~60% of its original strength because of reduction of the bond strength.
실리카퓸 종류변화에 따른 프리믹스시멘트 페이스트의 유동특성
황인성(Hwang Yin-Seong),金成日(Jin Cheng-Ri),최성용(Choi Sung-Yong),이해일(Lee Hai-Ill),김성수(Kim Sung-Su),한천구(Han Cheon-Goo) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
This study is to investigate the properties of the fluidity of the cement paste due to various and premixing silica fumes, and the results are summarized as following. The flow time of the paste using OPC is fastest among the various factors. It is delayed when FA was mixed comparing to BS. For the effect of the silica fume type, it is presented by order of A, B, and C. The flow of the paste is showed as the opposite tendency of the flow time of the paste, and it is displayed by order of B, A, and C. The viscosity of the paste is pwportional to the flow time of the paste. When FA is used, the orders are C, B, and A. For the BS, they are C, A, and B. All tests are showed for the straight tendency with the ring flow. The Correlation coefficient(R) are -0.847, 0.982, 0.981, and -0.882, so it was analyzed that they have close relationship.
폴리프로필렌 섬유의 혼입률 변화에 따른 고성능 콘크리트의 특성 및 폭열방지에 관한 연구
황인성 ( Hwang Yin-seong ),김기철 ( Kim Gi-cheol ),한민철 ( Han Min-cheol ),양성환 ( Yang Seong-hwan ),한천구 ( Han Cheon-goo ) 한국구조물진단유지관리공학회 1998 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.2 No.2
The purpose of this study is to investigate spalling resistance of high performance concrete with polypropylene(PP) fiber contents. Experimental results show that flowability and placeability in fresh concrete decrease, whereas air contents keep constant with the increase of PP fiber contents. PP fibers don't influence on the properties of hardened concrete, except for slight increase in compressive strength. When 0.1% of PP fiber are applied in concrete mixture, no spalling is found. Optimum addtion range of PP fiber for spalling resistance and keeping flowability is shown to be 0.1%(vl.).
폴리프로필렌 섬유의 혼입률 변화에 따른 철근콘크리트 기둥부재의 내화 특성
황인성 ( Hwang Yin-seong ),전선천 ( Jeon Seon-cheon ),이병열 ( Lee Byung-yul ),양성환 ( Yang Seong-hwan ),한천구 ( Han Cheon-goo ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.1
This paper is intended to present the properties of fire resistance of concrete column containing polypropylene fiber, According to the test results, as contents of PP fiber increase, spalled areas and depth of concrete column decrease. As for the effects of W/C, concrete column with 55% of W/C does not show spalling, while takes place in the force of spalling with 35% of W/C. After heating, residual strength of concrete column with 55% of W/C 40% of its original strength regardless of PP fiber contents, in case of 35% of W/C, residual strength after heating is shown to be improved.
W/C 및 폴리프로필렌 섬유의 혼입률 변화에 따른 콘크리트의 폭열 특성
황인성 ( Hwang Yin-seong ),한민철 ( Han Min-cheol ),이병렬 ( Lee Byimg-yul ),양성환 ( Yang Seong-hwan ),한천구 ( Han Cheon-goo ) 한국구조물진단유지관리공학회 1999 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.3 No.1
This paper is intended to investigate the spalling properties of concrete with W/C and polypropylene(PP) fiber contents. According to the experimental results, high strength concrete with W/C 35% and 45% contained no PP fiber take place the surface spalling and the failure of specimens after fire test, while concrete with W/C 55% and 65% does not take place the spalling. Also, concrete contained 0.10% PP fiber does not take place the spalling, regardless of W/C, therefore PP fiber is considered to be played importance roles on the spalling resistance.
단위수량 및 수축저감제 혼입률 변화에 따른 콘크리트의 건조수축 특성
황인성(Hwang Yin-Seong),한민철(Han Min-Cheol),한천구(Han Cheon-Goo) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.6
In this paper, fundamental and drying shrinkage properties of concrete are investigated varying with water content and shrinkage-reducing admixture (SRA) content to reduce drying shrinkage crack of structure concrete. For target slump and air content variation by unit water content, they are achieved by amending mixture proportioning. For the influence of unit water content on setting time, The reduction of unit watercontent resulted in retarding setting time due to an increase in superplasticizer dosage. For the influence of SRA dosage on engineering properties, fluidity and air content exhibited a tendency to decrease with an increase in SRA dosage, whereas setting time was accelerated. In 160kg/㎥ of unit water content, concrete exhibited highest compressive strength value. However, below or above 160kg/㎥ of unit water content, reduction in compressive strength is exhibited due to segregation. SRA dosage resulted in reduction of compressive strength of concrete compared with that of plain concrete. An increase in unit water content leaded to drying shrinkage of concrete due to an increase in evaporable water. However, the use of SRA exhibited a reduction in drying shrinkage. This is due to an decrease in both surface tension force and capillary tension force, and restriction of evaporating water in concrete. Whin the scope of the paper. an increase in SRA dosage with 1% is found to reduce the drying shrinkage with 10~15%.