• Title/Summary/Keyword: 영구거푸집

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Material and Structural Characteristics of High Performance Permanent Form Using Stainless Steel Fiber (스테인레스 강섬유를 이용한 고성능 영구거푸집의 재료 및 구조적 거동특성에 관한 연구)

  • Sim, Jong-Sung;Oh, Hong-Seob;Ju, Min-Kwan;Kim, Kil-Jung;Shin, Hyun-Yang
    • Journal of the Korea Concrete Institute
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    • v.18 no.1 s.91
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    • pp.73-82
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    • 2006
  • Nowadays, the general stripping work of form has brought some problems; increase of total constructing cost resulted from the man-dependent form work procedure and environmental issues by wasting the debonded form. In this study, to effectively reduce unnecessary cost and resolve the environmental problems caused by these kinds of reason, a permanent form method using stainless steel fiber was introduced then its material and structural characteristics were evaluated. In the case of material characteristic, the permanent form had a good ductile behavior in the result of flexural test of the permanent form panel and pull-out test of insert bolt which is installed in the permanent form and perfect bonding capacity with a field concrete. In the case of structural characteristic, compressive and tensile behavior of the permanent form was evaluated. It also showed a good structural behavior in the view of load-deflection relationship, crack patterns and additional strengthening effect.

Fire Resistance Properties of High Strength Concrete Column using ECC Permanent Form (ECC 영구 거푸집을 활용한 고강도콘크리트 기둥부재의 내화특성)

  • Kim, Yong-Ro;Song, Young-Chan;Kim, Ook-Jong;Lee, Do-Bum
    • Proceedings of the Korea Concrete Institute Conference
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    • 2008.11a
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    • pp.957-960
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    • 2008
  • In this study, it was investigated fire resistance properties of high strength concrete column using Engineered Cementitious Composites(ECC) permanent form as a countermeasure for explosive spalling of concrete on fire. As a test result, it was appeared that ECC permanent form is available as fire resistance method of high strength concrete if it is developed manufacturing technique and scheme for application controlling heat penetration through interface of permanent form and high strength concrete, and setting up mix proportion and thickness of ECC.

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A Development and Characterization of Refractory Panel (내화패널의 개발과 특성에 관한 연구)

  • Kim, Dong-Joon;Kwon, Young-Jin;Kim, Yong-Ro;Han, Byung-Chan;Kim, Jae-Hwan
    • Proceedings of the Korea Institute of Fire Science and Engineering Conference
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    • 2009.04a
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    • pp.61-66
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    • 2009
  • 최근 초고층 건축물 등에 적용되는 고강도콘크리트의 내화성능에 대한 문제점이 제기됨에 따라 국토해양부에서는 고강도콘크리트 내화성능 관리 기준을 고시한 바 있으며, 건설업계에서도 이에 대응하기 위해 다양한 기술 검토가 이루어지고 있다. 본 연구에서는 고강도콘크리트의 취약점으로 제기되고 있는 화재시의 폭렬문제에 대한 대응방안으로서 기존 연구를 통해 내화성능이 우수한 것으로 보고되고 있는 ECC 를 영구거푸집으로 활용한 고강도콘크리트의 내화성능을 검토하였다. ECC 영구거푸집을 활용한 고강도콘크리트 기둥부재의 내화성능 검토 결과, 영구거푸집과 고강도콘크리트 계면으로의 열 침투를 제어할 수 있도록 부재 생산 및 구축 방안을 검토하고, ECC의 적정 배합 및 두께를 확보한다면 고강도콘크리트의 내화성능 확보기술로서의 활용이 가능할 것으로 판단된다. 또한, 내화성 영구거푸집으로서의 단순 활용 방안 이외에 ECC의 우수한 물리적 성능을 활용하여 구조성능을 분담할 수 있는 방안으로의 지속적 검토가 필요할 것으로 판단된다.

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Structural Performance of Permanent Steel Formed Wide Beams in Construction Stage (강재 영구거푸집 와이드 보의 시공단계 구조성능)

  • Yu Na Park;Inwook Heo;Jae Hyun Kim;Khaliunaa Darkhanbat;Sung-Bae Kim;Kang Su Kim
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.27 no.5
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    • pp.130-138
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    • 2023
  • In this study, experimental and analytical studies were conducted on the structural performance of permanent steel formed wide beams in construction stage. Four specimens were fabricated with different rib spacings of the side steel formwork and fixing plate depths, and experimental tests were performed to investigate the effects of variables on the structural performance. Also, an finite element analysis model of the steel permanent formwork wide beam was proposed based on the test results. Using the proposed model, parametric studies were performed with variables including rib spacing of the bottom and side steel formwork, spacing, depth, and thickness of the fixing plate to derive optimized details. Furthermore, an artificial neural network model was developed to easily estimate the deformation of the steel permanent formwork wide beam with various details.

A Study of Design Parameter for the Field Application of High Performance Permanent Form (HPPF) Using Stainless Steel Fiber (스테인레스 강섬유를 이용한 고성능 영구거푸집적용 벽체구조물의 설계변수 연구)

  • Sim, Jong Sung;Oh, Hong Seob;Ju, Min Kwan;Ha, Woo Jin
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.12 no.2
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    • pp.59-66
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    • 2008
  • In the construction site, to improve the man-dependent form work, non-stripping form has been studied but the developed non-stripping form was hard to applied with respect to the cost, form size and performance. This study is for evaluating the adaptability of the developed non-stripping form named as high performance permanent form (HPPF). To do this, the analytical approach and parametric study were performed based on the research for fundamental material characteristic of the HPPF. The target concrete structure is a wall structure because of its effectiveness of HPPF. To evaluate the structural efficiency of the HPPF applied wall structure, FEM analysis was performed to decide the maximum placing height at one time then it was applied to design the wall structure. In the result of the analysis, the HPPF applied wall structure showed the lots of advantages that it can reduce the cost resulted from reducing concrete and steel rebar even if it has same structural performance to the conventional concrete wall structure with same dimension. With this analysis result, it can be evaluated that the HPPF applied concrete structure can be a concrete structure with the long term durability in site.

An Experimental Study of Bond Stress between Concrete and Various Kinds of FRP Plank used as a Permanent Formwork (영구거푸집으로 활용한 FRP 판의 종류에 따른 콘크리트와의 부착응력에 관한 실험적 연구)

  • Park, Chan-Young;Yoo, Seung-Woon
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.19 no.3
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    • pp.92-103
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    • 2015
  • Development of new concrete bridge deck system with FRP plank using as a permanent formwork and the main tensile reinforcement recently has been actively conducted. Concurrent use as a reinforcing material and a permanent formwork, it is possible to reduce the construction time and construction costs than the usual concrete slab. In this study, an experiment was carried out for the bond stress between cast-in-place concrete and the type of FRP plank using as a permanent formwork. The interfacial fracture energy that can be one of the most important parameters were evaluated for adhesion performance and bond stress to know the characteristics of the failure mechanism of the adhesion surface. Interfacial fracture energy of normal concrete is 0.24kN/m of GF11 case, in the case of GF21, 0.43kN/m appears, in the case of CF11 and GF31, 0.44kN/m and 0.46kN/m respectively it appeared. In case of RFCON, 0.52kN/m appears from GF12, the CF12 and GF22, 0.51kN/m and 0.36kN/m appeared each case.

An Experimental Study of Perfobond FRP-Concrete Composite Beam (퍼포본드 FRP-콘크리트 합성보의 실험적 연구)

  • Yoo, Seung-Woon;Kook, Moo-Sung
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.14 no.2
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    • pp.121-127
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    • 2010
  • An experimental study of composite beam with perforated fiber reinforced polymer(FRP) plank as a permanent formwork and the tensile reinforcement was performed. A combined formwork and reinforcement system can facilitate rapid construction of concrete members since no conventional formwork is needed, which requires time consuming assembly and dismantling. In order for a smooth FRP plank to act compositely with the concrete, the surface of the FRP needs to be treated to increase its bond properties. Aggregates were bonded to the FRP plank using a commercially available epoxy and perforated web of plank. No additional flexural or shear reinforcement was provided in the beams. For comparison, two control specimens were tested. One control had no perforated hole in the web of FRP plank and the other had internal steel reinforcing bars instead of the FRP plank. The beams were loaded by central patch load to their ultimate capacity. This study demonstrates that the perforated FRP plank has the potential to serve as a permanent formwork and reinforcing for concrete beam.

An Experimental Study on the Fire Resistance and Mechanical Properties of ECC Permanent Form (ECC 영구거푸집의 내화성능 및 역학적 특성에 관한 실험적 연구)

  • Kim, Yong-Ro;Song, Young-Chan;Oh, Jae-Keun;Kim, Jae-Hwan;Kim, Ook-Jong;Lee, Do-Bum
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2009.05c
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    • pp.75-78
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    • 2009
  • It was investigated fire resistance properties and mechanical properties of high strength concrete column using ECC(Engineered Cementitious Composites) permanent form by KS F 2257 Methods of fire resistance test for elements of building construction and compression test for application of precast concrete column method of high rise building in this study. As a test result, it was appeared that ECC permanent form is available as fire resistance method of high strength concrete and new precast concrete construction method for facilitating construction of high rise building.

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An Experimental Study for Flexural Failure Behavior of Composite Beam with Cast-in-place High Strength Concrete and GFRP Plank Using As a Permanent Formwork and Tensile Reinforcement (유리섬유강화폴리머 판을 영구거푸집 및 인장 보강재로 활용한 현장타설 고강도콘크리트 합성보의 휨 파괴거동에 관한 실험적 연구)

  • Um, Chan Hee;Yoo, Seung Woon
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.35 no.5
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    • pp.1015-1024
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    • 2015
  • An experiment of composite beam was performed which utilized glass fiber reinforced polymer (GFRP) plank as the permanent formwork with cast-in-place high strength concrete. This research analyzed the flexural failure behavior of composite beam by setting the sand coated at GFRP bottom surface, the perforation and interval of the GFRP plank web, and the width of the top flange as the experimental variables. As a result of the experiments for effectiveness of sand attachment in case of not perforated web, approximately 43% higher ultimate load value was obtained when the sand was coated than not coated case. For effectiveness of perforation and interval of gap, approximately 23% higher maximum load value was seen when interval of the perforation gap was 3 times and the fine aggregate was not coated, and approximately 11% higher value was observed when the perforation gap was 5 times on the coated specimen. For effectiveness of top flange breadth, the ultimate load value was approximately 12% higher in case of 20mm than 40mm width.