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고강도콘크리트용 내화피복재로 활용하기 위한 경량모르타르의 역학적 성상
임서형,유석형,문종욱 한국화재소방학회 2011 한국화재소방학회논문지 Vol.25 No.5
High strength concrete is the occurrence of explosive spalling associated with high temperature such as a fire. The spalling causes the sever reduction of the cross sectional area with the exposure of the reinforcing steel, which originates a problem in the structural behaviour. The purpose of this study is to investigate the mechanical properties of lightweight mortar using perlite and polypropylene fiber for fire protection covering material. For this purpose, selected test variables were the ratio of water to cement, the ratio of cement to perlite, contents of polypropylene fiber. As a result of this study, it has been found that addition of perlite and polypropylene fiber to mortar modifies its pore structure and reduces its density. And it has been found that a new lightweight mortar can be used in the fire protection covering material. 고강도 콘크리트는 화재 시 고온에 노출되어 폭렬현상이 발생된다. 폭렬은 철근노출과 함께 구조부재의단면을 감소시키며, 이로 인하여 구조적 거동에 심각한 문제를 발생시킨다. 본 연구의 목적은 이러한 고강도 콘크리트의 내화피복재로 활용하기 것으로 퍼라이트와 폴리프로필렌 섬유로 경량모르타르를 제조하여그 역학적 성상을 파악하는데 있다. 이에 따른 실험인자로는 물시멘트비, 골재시멘트비, 폴리프로필렌 섬유 첨가량이다. 연구결과 퍼라이트와 폴리프로필렌 섬유를 첨가함으로서 모르타르의 공극구조를 변화시킬수 있었으며, 단위중량을 감소시킬 수 있었다. 또한, 고강도 콘크리트의 내화피복재로서 경량모르타르를사용할 수 있는 가능성을 확인하였다.
임서형,황진석 진주산업대학교 건설기술연구소 1998 건설기술연구소보 Vol.1 No.-
The purpose of this study is to present data on the optimum planning and construction of aluminum curtain wall to apply high-rise buildings for improving planning and construction by performance test of aluminum curtain wall. From the results of study, the conclusion can be summarized follow. Air leakage can be diminished 3.5∼4 times in quantity and leak of water can be prevented by sticking the mullion and the silling part of sash with adhesive tape and vinyl. The leak of water through weep whole can be prevented by making the first seal and secondary membrane sheet on the contacting part of aluminum and other materials, planning the hole to cross each other in case of flowing backward of water by wind. It id identified as increasing structural steadiness by reforming projection window hand strike, reinforcing mullion fastener, reinforcing heat-treated mullion aluminum sash heat, and reinforcing bolt and nut of mullion and fastener by welding.
임서형,강현식 진주산업대학교 2001 論文集 Vol.40 No.-
The purpose of this study is to investigate mechanical properties of the polynmer modified concrete for concrete filled tubular. Latex dispersion on the basis of "styrene-butadiene rubber" was used as a cement modifier. Investigation of the fresh and hardened modified concrete behavior was made on the basis of testing concretes modified with 10, 20 percent of polymer admixture on the cement mass. The setting time of the polymer modified concrete was very retarded with the increase of the dosage of superplasticizers. The tensile and flexural strength was very increased with the increase of polymer-cement ratio. At the water-cement ratios 0.34, 0.29 and the polymer-cement ratio 0.1, compressive strength was slightly increased.
임서형,문종욱 국제차세대융합기술학회 2021 차세대융합기술학회논문지 Vol.5 No.6
본 논문은 친환경 자재의 건축현장에서의 친환경 자재에 대한 시대적 요구상황에서 한국 교유의 전통소 재인 숯과 황토를 첨가한 Bottom Ash 보드개발에 관한 연구를 진행한 것이다. 기존 숯과 황토를 건축용 소재로 활용하는 지속적인 노력에도 근본적인 문제점을 해결하지 못한 기술적 한계에서 본 연구는 기존 애로사항을 해결 하고 나아가 유해물질오염물질 저감용 보드를 개발하여 그 적용가능성을 입증하고자 하였다. 이를 검증하기 위해 경제성 및 실용성, 생산단가를 고려한 배합설계를 제시하였으며, 최종적으로 과일신선도와 밀폐공간내 에틸렌 가 스의 농도를 평가하여 실내용 보드로서의 적용 가능성을 확인하였다. 다음은 본 연구 결과에서 확보한 결론이다. 먼저, 매립회인 Bottom Ash를 활용한 친환경 보드의 개발을 2가지 유형으로 구분하여 제조하였으며, 필요한 실내 공간 조건에 따라 적절한 유형이 적용가능하라 판단된다. 또한 개발보드의 친환경성 여부를 판단하기 위해, 바나 나의 신선도 평가에서 확연하게 우수한 결과를 확인하였으며, 추가적으로 합판박스와의 에틸렌가스 비교실험에서 도 개발보드의 숯과 황토의 영향으로 가스흡착 성능이 우수한 것으로 나타났다. This thesis is a study on the development of bottom ash boards added with charcoal and loess, the traditional materials of Korea, in the context of the demands of the times for eco-friendly materials in the construction site of eco-friendly materials. Due to the technical limitations that did not solve the fundamental problems despite continuous efforts to use the existing charcoal and loess as building materials, this study tried to solve the existing difficulties and further develop a plate for reducing indoor pollutants to prove its applicability. In order to verify this, a formulation design considering economic feasibility, practicality, and production cost was presented. Finally, the freshness of fruit and the concentration of ethylene gas in the enclosed space were evaluated to confirm its applicability as a building interior material. The following are the conclusions obtained from the results of this study. First, the development of eco-friendly boards using bottom ash, which is a landfill ash, was manufactured by dividing it into two types, and it is judged that an appropriate type can be applied according to the required indoor space conditions. And in order to determine the eco-friendliness of the developed plate, the freshness evaluation of the banana confirmed excellent results. In addition, the ethylene gas comparison experiment with the plywood box showed that the developed plate had excellent gas adsorption performance under the influence of charcoal and loess. appear.
고유동콘크리트의 배합분석을 통합 시멘트페이스트와 모르터의 유동성에 관한 연구
임서형,김재훈 진주산업대학교 1999 산업과학기술연구소보 Vol.- No.6
To analyze the features on High fluidity concrete mixing tended to increasing durability of concrete & construction rationalization based on Japanese papers, high fluidity concrete mixing was analyzed. From the results of analysis, the range for using materials was W/P 0.36, S/a 49.8%, amount of unit water 169㎏/㎥, binder 475.5㎏/㎥, fine aggregate 813.4㎏/㎥, coarse aggregate 843.3㎏/㎥. In addition, in composition of high fluidity concrete, flow and rheology value of mortar is more depended on shear velocity than shear stress, which are depended on the find aggregate.
배합조건 및 다짐하중에 따른 포러스 콘크리트의 특성에 관한 실험적 연구
임서형 한국구조물진단유지관리공학회 2015 한국구조물진단유지관리공학회 논문집 Vol.19 No.3
포러스 콘크리트는 시멘트, 물 그리고 굵은골재로 구성되어 있으며, 공기 및 물의 투과 그리고 흡음 등 지구 환경부하를 저감시키기 위 해 사용되어 왔다. 그러나 포러스 콘크리트의 물리적, 역학적 성상은 시공시 이루어지는 다짐하중에 의해 변한다. 따라서 본 연구에서는 결 합재 종류, 물-결합재비, 목표공극율에 따른 포러스 콘크리트의 물리적, 역학적 성상을 파악하였으며 특히, 다짐하중에 따른 포러스 콘크리 트의 공극율, 강도, 투수계수의 물성변화를 파악하였다. 본 연구에서 사용한 골재는 부순자갈 생산과정에서 발생되는 부산물로서 최대크기 는 13mm이다. 연구결과, 포러스 콘크리트의 목표 공극율, 투수계수, 압축강도는 공극율과 밀접한 상관성을 지니고 있으며, 공극율은 포러 스 콘크리트의 배합설계로 제시할 수 있는 가능성이 있는 것으로 판단되다. 포러스 콘크리트의 압축강도는 팽창재 치환율 5%에서 가장 높 게 나타났으며, 실리카 흄 치환율 10%에서 치환하지 않은 콘크리트보다 32% 높게 나타났다. 그리고 다짐하중을 변화시킨 본 연구결과 압 축강도는 하중 15kN부터 증가하였고, 공극율은 하중 0.8kN부터, 투수계수는 하중 35kN부터 각각 감소하는 것으로 나타났다. Porous concrete consists of cement, water and coarse aggregate and has been used for the purpose of decreasing the earth environmental load such as air and water permeability, sound absorption, etc. However, the physical and mechanical properties of porous concrete changes due to compaction load during construction. For such a reason, the purpose of this study is to investigate the physical and mechanical properties of porous concrete according to the kinds of binder, the ratio of water to binder and target void ratio. In particular, this study has been carried out to investigate the influence of compaction load on the void ratio, strength and coefficient of permeability. Aggregate used in this study are by-products generated during production of crushed gravel with a maximum size of 13mm. The results of this study showed that the target void ratio, the coefficient of permeability and compressive strength of porous concrete had a close relationship with the void ratio, and it will be possible that the void ratio is suggested by the mix design of porous concrete. The compressive strength of porous concrete was the highest at the content of the expansive admixture of 5% and compared to non-mixture, 10% mixture of silica fume improved compressive strength about 32%. And in the result of the study to change the compaction load, the compressive strength increased from the load of 15kN, the void ratio decreased from the load of 0.8kN, the coefficient of permeability decreased from the load 35kN, respectively.
임서형,서원택 진주산업대학교 2000 산업과학기술연구소보 Vol.- No.7
The purpose of this study is to estimate the fluidity of mortar with a new viscosity modifying admixture. For this pupose, selected test variables were the ratio of water to cement and cement to fine aggregate, contents of superplasticizer and viscosity modifying admixture. As a rusult of this study, it is considered that the loss of flow with time of mortar occurs much faster with a superplasticizer and no viscosity modifying admixture. Also, it has been found that addition of viscosity modifying admixture to mortar modfies its fluidity and reduces its segregation by increasing the mortar viscosity.
임서형,강현식 진주산업대학교 2001 산업과학기술연구소보 Vol.- No.8
The purpose of this study is to investigate drying shrinkage of the ultra high strength concrete using silica fume. For this purpose, the properties of concrete are examined with varing water/binder ratio, binder content, sand/aggregate ratio. As a rusult of this study, shrinkage is larger the higher wate/binder ratio because the latter determines the amount of evaporable water in the cement paste and the rate at which water can move towards the surface of the specimen. At a constant water/binder ratio, shrinkage increases with an increase in the sand/aggregate ratio. And the rate of shrinkage occurs rapidly at an earlier age.