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원종필(Won Jong-Pil),박찬기(Park Chan-Gi),최민정(Choi Min-Jung) 대한토목학회 2008 대한토목학회논문집 A Vol.28 No.3A
본 연구에서는 폐 PET병을 사용하여 구조적으로 효과가 있는 재생 PET섬유를 생산하였고 세 가지 형상의 재생 PET섬유와 시멘트 매트릭스와의 부착성능을 평가하였다. 또한 세 가지 형상의 재생 PET섬유로 보강된 콘크리트의 휨성능 시험을 실시하였다. 시험결과 재생 PEl섬유는 우수한 부착성능의 증가를 보여주었다. 휨시험 결과 재생 PET섬유는 콘크리트의 휨인성을 증가시킨다는 것을 증명하였다. 부착 및 휨시험 결과를 기본으로 요철형 재생 PET섬유의 부착 및 휨성능이 다른 형상의 섬유와 비교하여 가장 우수하였다. This study can be used to produce structurally efficient recycled PET fiber from used waste PET bottles and evaluated the bond performance of the three type of recycled PET fiber and cement matrix. Also, the flexural tests were performed on concrete reinforced using the three type of recycled PET fibers. The test results showed that the recycled PET fiber was significantly increased bond strength. The flexural test results are demonstrated that recycled PET fibers improved the flexural toughness of concrete. Based on the bond and flexural test results, the bond and flexural performance of embossed type recycled PET fibers were significantly better than those of the other shape fibers.
Crimped Type 합성섬유로 보강된 시멘트 복합재료의 부착, 휨 및 소성수축균열제어 특성
원종필(Won Jong Pil),박찬기(Park Chan Gi),임동휘(Lim Dong Hee),백철우(Back Chul Woo) 대한토목학회 2006 대한토목학회논문집 A Vol.26 No.6A
본 연구의 목적은 1.8㎜의 높이와 6㎜의 주기를 가지고 있는 crimped type 합성섬유로 보강된 시멘트 복합재료의 부착 및 휨특성과 소성수축균열제어 특성을 평가하는 것이다. 부착 및 휨 시험은 JCI SF-4 및 JCI SF-8에 의해서 실시하였고, 소성수축균열시험은 시멘트 복합재료의 소성수축균열의 감소에 영향을 미치는 섬유의 효과를 평가하기 위하여 실시하였다. 실험결과 crimped type 합성섬유는 직선형태의 섬유와 비교하여 부착하중 및 계면인성이 우수하였고, 콘크리트의 휨인 성을 증가시켰다. 또한 crimped type 합성섬유는 섬유의 혼입율이 0.00%에서 1.00%로 증가함에 따라 소성수축균열 저항성이 증가하였다. 특히, 섬유의 혼입율이 0.50% 이상이 되면 소성수축균열 조절능력이 매우 우수하였다. The purpose of this study are to evaluated bond, flexural properties and control of plastic shrinkage cracking of crimped type synthetic fiber with amplitude 6㎜ and height 1.8㎜ reinforced cement based composites. Bond and flexural test were conducted in accordance with the JCI-SF 8 and JCI SF-4 standard, respectively. The plastic shrinkage cracking test was conducted for evaluating the effect of fiber in reducing shrinkage cracking in cement based composites. Test results indicated that the crimped typel synthetic fibers performed significantly better than the straight type fiber in terms of interface toughness and pullout load and the crimped type synthetic fibers improved the flexural toughness of concrete. Also, the increasing the crimped type synthetic fiber volume fraction from 0.00% to 1.00% improved the plastic shrinkage cracking resistance. Specially, the effect of control of plastic shrinkage cracking is excellent at the more than 0.5% fibre volume fraction.
박찬기 ( Park Chan Gi ),원종필 ( Won Jong Pil ) 한국농공학회 2003 韓國農工學會誌 : 전원과 자원 Vol.45 No.2
Over the last decade fiber-reinforced polymer (FRP) reinforcement consisting of glass, carbon, or aramid fibers embedded in a resin such as vinyl ester, epoxy, or polyester has emerged as one of the most promising and affordable solutions to the corrosion problems of steel reinforcement in structural concrete. But reinforcing rebar for concrete made of FRP rebar has linear elastic behavior up to tensile failure. For safety a certain plastic strain and an elongation greater than 3% at maximum load is usually required for steel reinforcement in concrete structures. The same should be required for FRP rebar. Thus, the main object of this study was to develop new type of hybrid FRP rebar Also, this study was evaluated to the mechanical properties of Hybrid FRP rebar. The Manufacture of the hybrid FRP rebar was achieved by pultrusion, and braiding and filament winding techniques. Tensile and interlaminar shear test results of Hybrid FRP rebar can provide its excellent tensile strength-strain behavior and interlaminar stress-strain behavior.
시멘트 매트릭스 내에서 폴리올레핀계 합성섬유의 친수성처리에 따른 인발거동
원종필(Won Jong-Pil),박찬기(Park Chan-Gi),김윤정(Kim Yun-Jeong),이시원(Lee Si-Won) 대한토목학회 2007 대한토목학회논문집 A Vol.27 No.3A
본 연구에서는 숏크리트 및 콘크리트을 포함한 시멘트 복합재료에 적용하기 위한 폴리올레핀계 합성섬유의 부착성능을 향상시키기 위한 연구를 실시하였다. 이를 위하여 첫 번째로 폴리올레핀계 합성섬유의 부착성능 문제점을 해결하기 위하여 섬유의 모양을 원주형에서 절곡형(crimped type)으로 변화시켰다. 두번째로 폴리올레핀계 합성섬유의 표면을 친수성처리하여 인발실험을 통하여 친수성 효과를 평가하였다. 실험결과 섬유의 형상변화는 시멘트 복합재료와 폴리올레핀게 합성섬유의 부착성능을 크게 향상시킬 수 있었다. 특히 부착강도보다는 인발에너지에서 효과가 더 크게 나타났다. 친수성 처리에 따른 부착성능의 향상은 mPP의 농도가 15%일 때 가장 성능이 우수하게 나타났다. 이는 폴리올필레핀계 섬유 표면의 코팅율과 관계가 있는데 mPP의 농도가 15%일 때 100%에 가까운 친수성 처리율을 나타내어 이와 같은 결과를 보여주었다. 이와 같은 결과는 인발실험 후 섬유의 표면관찰을 통하여 확인할 수 있었다. This study peformed the test for increasing the bond performance of polyolefin based synthetic fiber in order to apply to cement based composite including shotcrete and concrete. In the first process, in order to solve the problem of bond performance of polyolefin based synthetic fiber, this study was changed the shape of fiber into crimped type from smooth cylinder type. Secondly, this study evaluated hydrophilic surface treatment effect of polyolefin based synthetic fiber through pullout test. Test results were showed that the change of fiber shape could increase the bond performance of cement matrix and the polyolefin based synthetic fiber. Especially, more effect was obtained in pullout energy rather than in bond strength. The improvement of bond performance with hydrophilic treatment rate showed its best performance when the concentration of mPP was 15%. This is related with the coating rate on the surface of polyolefin based synthetic fiber, which was proven in the result that when the concentration of mPP is 15%, it showed almost 100% of hydrophilic surface treatment rate. This result could be confirmed through the observation of fiber surface after pullout test.
화학적 환경에 노출된 콘크리트 보강용 FRP 보강근의 부착 성능
박찬기,원종필,Park, Chan-Gi,Won, Jong-Pil 한국농공학회 2004 한국농공학회논문집 Vol.46 No.3
FRP reinforcing bars(rebars) are produced through a variety of manufacturing process includes pultrusion, and filament winding and braiding etc. Each manufacturing method produces a different surface condition of FRP rebar. The surface properties of FRP rebar is an important property for mechanical bond with concrete. Current methods of providing surface deformation to FRP rebars include helical wrapping, surfaces and coating and rib molding. The problem with the helical wrapping method is that it can not provide enough surface deformation for good bond and it can be easily sheard off from the FRP rebars. Sand coating and rib molding provide surface deformation only to the outer FRP skins. Therefore, FRP rebar has about 60% of bond strength of steel rebar. The main objective was to evaluate the bond properties of FRP rebar after environmental exposure. Five types of FRP rebar includes CFRP ISO, GFRP Aslan, AFRP Technora CFRP(Korea), and GFRP(Korea) rebars performed direct bond tests. Also, FRP rebar bond specimens were subjected to exposure conditions including alkaline solution, acid solution, salt solution and deionized water etc. According to bond test results, CFRP(Korea) and CFRP(Korea) rebars were found to have better bond strength with concrete than previous FRP rebars. Also, FRP(Korea) rebar had more than about 70% in bond strength of steel rebar.