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하이브리드 섬유를 적용한 고강도 내화콘크리트의 단면크기에 따른 내화성능에 관한 실험적 연구
김흥열(Kim, Heung-Youl),김형준(Kim, Hyung-Jun),조범연(Cho, Bum-Yean),민병렬(Min, Byung-Youl),안찬솔(Ahn, Chan-Sol) 한국화재소방학회 2011 한국화재소방학회 학술대회 논문집 Vol.2011 No.춘계
최근 고강도 콘크리트의 내화성능이 사회적 이슈로 부각되고 국토해양부에서 고강도 콘크리트의 내화성능 관리기준(안)이 고시되면서 국내에서도 고강도 콘크리트의 내화성능을 향상시키기 위한 연구가 활발히 진행되고 있다. 본 연구에서는 유기질 섬유인 폴리프로필렌섬유(PP섬유)와 강섬유를 하이브리드한 Fiber Cocktail를 혼입한 고강도 내화콘크리트 개발을 위한 연구를 수행하였다. PP섬유는 <TEX>$160^{\circ}C$</TEX>의 온도에서 용융되어 콘크리트 내부에 미세한 통로를 형성하여 고강도 콘크리트 부재 내의 수증기압 및 공극압을 효과적으로 배출하여 고강도 콘크리트의 폭렬발생을 억제시키는 데 효과적이며, 강섬유는 PP섬유가 용융된 후의 고강도 콘크리트 부재의 균열 발생을 억제하며 외부로부터 침투하는 열기를 차단할 수 있다. 100MPa 고강도 콘크리트의 내화실험을 실시하여 최적단면 조건을 도출하기 위해 철근온도를 분석한 결과, 단면이 커질수록 철근온도는 점차 낮아지는 경향이 나타났으며 <TEX>$600{\times}600mm$</TEX>, <TEX>$800{\times}800mm$</TEX> 단면에서 내화성능을 확보할 수 있는 것으로 나타났으며, 이중 경제성을 고려할 경우 <TEX>$600{\times}600mm$</TEX> 단면이 최적단면으로 도출되었다. 또한 도출된 <TEX>$600{\times}600mm$</TEX> 단면에 대해서 철근의 온도를 분석한 결과 PP섬유 <TEX>$1.5kg/m^3$</TEX>와 강섬유 <TEX>$40kg/m^3$</TEX>를 배합한 Fiber Cocktail이 최적배합비로 나타났다.
Fiber Cocktail을 혼입한 고강도 콘크리트의 열팽창율 특성 및 모델 제시
김흥열(Kim Heung-Youl),채한식(Chae Han-Sik),전현규(Jeon Hyun-Kyu),염광수(Youm Kwang-Soo) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
This research is to propose the characteristics of thermal expansion rate and the model about the high strength concrete of 100 ㎫ in order to set the prospective model and conduct the safety evaluation depending on the existence of fiber cocktail. The thermal expansion rate of the concrete tends to increase over the overall temperature range and between 500℃ and 600℃, it shows rapid increasing and after the range it shows soft increasing. In case of the normal strength concrete, as it is affected by the high temperature, the rate tends to increase. But it is soft relative to the high strength concrete. And, the high strength concrete shows the rate increasing as it gets hot. Even though there are few differences, it shows soft increasing after 500℃ or 600℃. It is considered that as the movement of the internal opening and evaporation increase, the expansion rate increases up to 500℃ or 600℃. After a certain temperature, even though the volume of the internal opening increases, it seems to be lack of the amount of the openings to disperse the internal pressure. And, although the expansion rate affects strength, as it is high strength, the strength is affected by fly ash, PP fiber, and fiber cocktail mixing amount. As the PP fiber, Fiber cocktail of the high strength fiber increase about the high temperature, the expansion rate becomes lower relative to the concrete which is not mixed with the fiber cocktail. And, in this research, the model for the expansion rate about the high strength concrete of 100Map depending on the existence of the fiber cocktail is proposed.
Fiber Cocktail을 혼입한 고강도 콘크리트의 열전도율 특성 및 모델 제시
김흥열(Kim Heung-Youl),채한식(Chae Han-Sik),전현규(Jeon Hyun-Kyu),염광수(Youm Kwang-Soo) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
This research is to propose the characteristics of thermal conductivity and the model up to compression strength of 100㎫ in order to set the thermal conductivity prospective model of the high strength concrete depending on the existence of the fiber cocktail. As the result, the thermal conductivity of the concrete tends to decrease over the overall temperature range. As the concrete is the high strength, the value of the thermal conductivity is smaller. And, as it is high temperature, the value tends to decrease. But, between 400℃ and 600℃, the value becomes constant. It is considered that expansion of the aggregate or the cement paste affect to the thermal conductivity caused by the high temperature. And it is more effective to the high strength concrete than the normal strength concrete. It is also more affected by the ratio of mixture for the PP fiber and strength fiber cocktail than the ratio of the mixture of the fly ash. And, in this research, the model of the thermal conductivity about the high strength concrete of the compression strength 100㎫ depending on the existence of fiber cocktail is proposed.
Fiber Cocktail을 혼입한 고강도 콘크리트의 비열 특성 및 모델 제시
김흥열(Kim Heung-Youl),채한식(Chae Han-Sik),전현규(Jeon Hyun-Kyu),염광수(Yom Kwang-Soo) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
This research is to propose the characteristics of the specific heat and the model about the high strength concrete which has up to 100 ㎫ of compression strength in order to set the prospective model for transferring the heat in the high strength concrete depending on the existence of the fiber cocktail. As the result of the research, as the strength of the concrete increases, the value of the specific heat at 100℃ increases but the value from 400~500℃ keeps constant. In case of the high strength concrete 40ㆍ50 ㎫ and 60~100 ㎫, the result is similar. For the 50 ㎫ high strength concrete which is mixed with fly ash 15 % and fiber cocktail (PP 1.0%, strength fiber 0.5%), the value at 600℃ of the internal temperature shows the highest. At 100℃, normal strength concrete of 40~50 ㎫ shows the lower value than the normal concrete, and concrete of 60-100 ㎫ shows the similar characteristics with the normal concrete, but it shows larger value than 40-50 ㎫. Therefore, the concrete shows the high value of the specific heat when it is mixed with only fly ash rather than when it is mixed with nothing. Depending on the amount of the mixture for fiber cocktail with PP and strength fiber, it shows various results. High strength concrete of over 40 ㎫ shows similar characteristics from 400~500℃. And, the specific heat model produced from this research shows the similar behavior with the concrete of 30 ㎫. But, it is set by relative lower grade. And it is set by showing differences depending on the amount of mixture for the fiber cocktail rather than the amount of the mixture for the fly ash.