잔골재 종류에 따른 내화피복용 모르타르의 고온 성상에 관한 연구

임서형,Lim, Seo-Hyung 한국건설순환자원학회 2014 한국건설순환자원학회 논문집 Vol.2 No.2

High strength concrete has a structural advantage as well as superior usability and durability, so that its application in building is being steadily augmented. However, in the high temperature like in a fire, the high strength concrete has extreme danger named explosive spalling. It is known that the major cause of explosive spalling is water vapour pressure inside concrete. General solution for preventing concrete from spalling include applying fire protection coats to concrete in order to control the rising temperature of members in case of fire. The purpose of this study is to investigate the high temperature properties of fireproof mortar using organic fiber and various types of fine aggregate for fire protection covering material. The results showed that addition of perlite and polypropylene fiber to mortar modifies its pore structure and reduces its density. This causes the internal temperature to rise. As a results, it is found that a new fireproof mortar can be used in the fire protection covering material in high strength concrete. 고강도 콘크리트는 구조적으로 우수하며 사용성 및 내구성이 뛰어나 건축물에서 그 활용성이 꾸준히 증가하고 있다. 그러나 화재처럼 고온에서 고강도 콘크리트는 폭렬이 발생될 가능성이 있으며, 폭렬 원인은 콘크리트 내부의 수증기압이 가장 큰 원인으로 알려져 있다. 콘크리트의 폭렬을 제어할 수 있는 일반적인 방법은 콘크리트 표면에 내화피복을 사용하여 화재 시 부재의 온도상승을 억제하는 방법이 있다. 이에 따라 본 연구에서는 각종 골재와 유기섬유를 사용하여 콘크리트 내화피복용 모르타르를 제조하고 그 고온 성상을 파악하고자 한다. 실험결과 퍼라이트와 폴리프로필렌 섬유를 사용한 모르타르는 내부공극과 밀도를 변화시켜 내부온도 상승을 지연시킨다. 그 결과 고강도 콘크리트의 폭렬을 방지할 수 있는 내화 피복재로 활용 가능하다.

충전강관용 폴리머 시멘트 콘크리트의 역학적 성상

임서형(Lim Seo-Hyung),강현식(Kang Hyun-Sik),지남용(Jee Nam-Yong) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.10

The purpose of this study is to investigate mechanical properties of the polymer cement concrete for CFT. 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 and 20 percent of polymer admixture on the cement mass.<br/> The setting time of the polymer cement concrete was very retarded with the increase of the dosage of superplasticizers and polymer-cement ratio. The increase of flexural strength for concrete modified with 10 and 20 percent of polymer admixture was 55 and 64 percent, respectively. At the polymer-cement ratios of 10 and 20 percent, the increase of tensile strength was 30 and 47 percent, respectively. And modules of elasticity and shrinkage of the polymer cement concrete was decreased with the increase of polymer-cement ratio. At the maximum stress, strains increased with the polymer-cement ratio and CFT filled polymer cement concrete did not show decreasing behavior after reaching the ultimate strength.

원예식물을 식재한 화재확산 방지용 벽면녹화 기술연구

문종욱,임서형,Moon, Jong-Wook,Lim, Seo-Hyung 한국재난정보학회 2018 한국재난정보학회 논문집 Vol.14 No.2

연구목적 : 본 연구는 전통시장의 화재확산 방지를 위해 지붕 위에 적용한 벽면녹화 기술을 활용한 벽체개발이다. 연구방법 : 개발한 벽면에서 설치된 살수헤드는 평상시에 식물을 위해 사용하다가 화재발생시 인접 건물로 화재가 확산되지 않도록 할 수 있도록 살수배관 겸용 사용이 가능하도록 설계하였다. 또한, 벽면에 식재된 식물의 생장을 위하여 최 상층부 및 일부 구간에 살수헤드를 부착하여 필요시 살수 할 수 있는 시스템을 구축하였으며, 화재발생과 같은 유사시에 보다 많은 양의 물을 살수하여 화재확산방지효과를 극대화 할 수 있도록 설계하여 객관성을 입증하고자 하였다. 연구결과 : 이러한 기술을 통해 전통시장과 같이 밀접건물 상층부에 설치 가능한 벽체개발을 제안하였으며, 구조물과 스프링클러와의 일체형으로 별도의 차단설비가 불필요하게 설계하였다. 그리고 스프링클러가 식물의 살수와 화재확산방지 기능을 동시에 수행이 가능하다. 이는 국내에서 유일하게 제안한 화재확산방지용 대안기술이라 판단된다. 결론 : 본 연구에서는 화재확산 저감효과의 정량화 성능 도출을 위해 직접 디자인한 벽체설계를 통해 벽면시스템의 화재진압 방법, 그리고 벽면자체의 내구성 및 난연성능을 검증하였다. Purpose : This study is to develop walls using wall recording technology applied on roofs to prevent fire spread in traditional markets. Method : The spray head installed on the developed wall was designed so that the fire does not spread to adjacent buildings after being used for plants. In addition, a spray head was attached to the upper section and some sections for the growth of plants planted on the wall to prevent the spread of fire. Results : These technologies suggested the development of walls that can be installed at the upper level of buildings, such as traditional markets, and separate isolation facilities were not necessary because they are integrated with structures and sprinklers. In addition, sprinklers can perform both the plant spray and fire spread prevention functions. It is believed that this is the only alternative technology proposed in Korea to prevent the spread of fire. Conclusion : In this study, the wall design, designed directly to derive the quantitative performance of the fire spread reduction effect, demonstrated the fire suppression method of the wall system, the durability of the wall itself, and the flame retardability performance.

Prefab 건축물에 적용 가능한 난연제 연구

문종욱(Moon, Jong Wook),임서형(Lim, Seo Hyung) 한국주거환경학회 2016 주거환경(한국주거환경학회논문집) Vol.14 No.4

Fire suppression is almost impossible if the flame continues until the sandwich panels fire. A fire in a sandwich panel can cause flames and toxic gases, most of which can lead to serious property damage and personal injury. Therefore, in this study, sandwich panels are vulnerable to fire, and their fire resistance is lessened, making them the most vulnerable materials with EPS, especially vulnerable to flame. Therefore, a study was conducted to improve the performance. In the present study, the mixing design of flame retardants was finally assigned to three or four formulations, the use of which contained beta-sodium borosilicate relative to 100% of the solution, and the addition of a weight of 0.4 to 0.8 Respectively. Sandwich panels are a typical construction material among flammable materials and are limited to flammable materials, not standard panels of fire resistance performance. Therefore, a manufacturing method that can be judged as safe at the same level as glass fiber has been studied. To this end, glass-wool used in composite panels was used in the same test method, and flame spreading on the molten surface was also focused on fire resistance performance. In the evaluation of the sandwich panel through the development of the final flame retardant, cracks and other flames were not generated without melting in all the panel parts satisfying the fire resistance performance. This is because the flame retardant material is completely melted when the beads inserted into the sandwich panel are coated and the flame is penetrated.

圓形 및 角形鋼管에 고강도 콘크리트를 充塡한 短柱의 軸壓縮擧動

강현식(Kang Hyun-Sik),임서형(Lim Seo-Hyung),문태섬(Moon Tae-Sup) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.4

This paper aims to report the experimental study on the axial compressive behavior of tubular stub columns filled with variable concrete strength(fcm=500, 700, 1.000kgf/cm²). Thirty-two specimens were tested to investigate the relationship between concrete strength and the ultimate strength of stub column. The effects of inner concrete on the failure mode, the ultimate strength, initial stiffness and deformation capacity were discussed. Also this paper presents experimental results on the strength and deformation of concrete-filled steel stub columns. Because the strength of concrete filled into the hollow tube was limited less than 500kgf/cm² in Korean standard. From this experimental study, it was found that the axial strength of CFT column was not proportioned increased with the compressive strength of concrete. Both circular and square stub column specimens filled with the compressive strength of 1000kgf/cm² concrete belonged to the failure mode 6 having a steeply decline curve after reaching the maximum load. Therefore, this results can make a contribution to the development of design standard.

단열양생을 활용한 고강도 매스 콘크리트의 압축강도 관리에 관한 연구

조규현(Cho Kyu-Hyun),김제섭(Kim Jae-Sub),백민수(Paik Min-Su),임서형(Lim Seo-Hyung),이영도(Lee Yonug-Do),정상진(Jung Sang-Jin) 대한건축학회 2005 大韓建築學會論文集 : 構造系 Vol.21 No.8

충전강관용 폴리머 시멘트 콘크리트의 역학적 성상

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.

초음파에 의한 콘크리트의 비파괴검사에 관한 연구

임서형,강현식 진주산업대학교 2000 論文集 Vol.39 No.-

The purpose of this study is to suggest the non-destructive equation for the estimation of concrete strength by ultrasonic pulse velocity about the 28day compressive strength of 600∼1000㎏/㎠. The correlation equations between the ultrasonic pulse velocity and the compressive strength of concrete are follows. ① F_c = 1198.4V_p - 5020 (R^2 = 0.83, plain concrete) ② F_c = 1010.0V_p - 4001 (R^2 = 0.92, concrete with 10% silica fume content) ③ F_c = 896.3V_p - 3514 (R^2 = 0.81, ①+②) where, F_c : compressive strength(㎏/㎠), V_p : ultrasonic velocity(㎞/sec)

알루미늄 커튼 월의 성능개선에 관한 연구

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.

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.