• Title/Summary/Keyword: Synthetic Fibers

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Pullout and Flexural Performance of Structural Synthetic Fibers by Geometry and Sectional Area Change (구조용 합성섬유의 형상 및 단면적 변호에 따른 부착 및 휨 성능)

  • Won, Jong-Pil;Back, Chul-Woo;Park, Chan-Gi;Han, Il-Yeong;Kim, Bang-Lae
    • Journal of the Korea Concrete Institute
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    • v.15 no.5
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    • pp.643-649
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    • 2003
  • The purpose of this study were evaluated to flexural and bond performance by sectional area and geometry change through bond and flexural test of a structural synthetic fiber. Six deformed structural synthetic fibers were investigated and pullout and flexural test was conducted. Included parameters is three different geometries of fiber and two of fiber sectional area. The test result shows that the cycles and amplitude of structural synthetic fiber increased, pullout load and pullout fracture energy decreased and flexural strength increased, if sectional area is same. The sectional area increased, pullout load and pullout fracture energy increased and flexural strength decreased, if cycles and amplitude of structural synthetic fiber is same. Based on test results, structural performance of the concrete could know that is influence by pullout performance of fiber as well as various factor (fiber number, material properties etc).

Bond, Flexural Properties and Control of Plastic Shrinkage Cracking of Crimped type Synthetic Fiber Reinforced Cement Based Composites (Crimped Type 합성섬유로 보강된 시멘트 복합재료의 부착, 휨 및 소성수축균열제어 특성)

  • Won, Jong Pil;Park, Chan Gi;Lim, Dong Hee;Back, Chul Woo
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.26 no.6A
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    • pp.1033-1039
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    • 2006
  • 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 mm and height 1.8 mm 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.

Development of highly sensible wool mixed fabric with conjugated texturing and yarn dyeing technologies

  • Park, Joon-Soo;Seo, Mal-Yong
    • Proceedings of the Korean Society of Dyers and Finishers Conference
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    • 2009.03a
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    • pp.229-230
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    • 2009
  • Recently the demand for wool has been gradually decreasing due to global warming, oil depletion, Coolbiz campaign to reduce CO2 emission, and preference for business casual wear, while the price for wool materials has been constantly increasing. Wool, characterized by the natural touch and unique sensibility, is considered as one of the best natural materials, including silk. For wool, currently Korea almost depends on import from foreign countries. Therefore, 100% wool products cannot be competitive in terms of pricing and current trend. To secure sustaining competitiveness in the fiber market, it is required not only to develop new wool materials that enable expression of new sensibility that cannot be expressed by conventional wool fibers, but also to pursue differentiation of fundamental sensibility and functionality by highlighting advantages for wool as a natural fiber but by reducing its disadvantages through dominant conjugation with synthetic fibers. This study attempted to improve the technology of differentiating wool-like synthetic fibers such as polyester and combine technology with sensibility through mixing with wool materials. It also aimed to develop wool-like stretch materials and pre-treating and yarn dyeing technologies that enable fabrics to main natural wool-like touch and stretch, and ultimately to develop wool mixed fabrics that have new sensibility and functionality.

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Dyeing properties on synthetic fibers with indigo - Polyester, PTT/Spandex - (인디고의 합성섬유 염착특성 - 폴리에스테르, PTT/Spandex -)

  • Park, Young-Min;Jeong, Woo-Young;Kim, Su-Ho;Yoon, Seok-Han;Son, Young-A
    • Textile Coloration and Finishing
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    • v.19 no.3
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    • pp.12-17
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    • 2007
  • In this study, we have investigated properties and behaviors of the indigo vat dyeings on synthetic fibers, namely PET and PTT/Spandex. In addition, indigo vat dyeing conditions such as dyeing temperature, dye concentration and pH were optimized. The finding results show that higher color strengths of indigo dyeings on the two types of applied fibers were obtained at $110^{\circ}C$ and $90^{\circ}C$, respectively. Furthermore, acid leuco dyeings on the fiber substrates using acetic acid and formic acid show higher dye uptake with compared to alkali leuco counterparts.

Application of an Anionic Syntan on Nylon 6.6 Fibers: Exhaustion Properties and Staining Resistance (음이온성 syntan을 이용한 나일론 6.6 섬유의 흡착거동 및 오염방지성)

  • 손영아;홍진표;김태경
    • Textile Coloration and Finishing
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    • v.15 no.6
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    • pp.18-26
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    • 2003
  • Nylon 6.6 was treated with anionic synthetic tanning agent at different pH values, temperatures and liquor ratios to determine exhaustion properties. Treatments using syntan were conducted to the undyed nylon 6.6 fiber and three acid dyeings and then samples of the bath solution were subjected to HPLC analysis. Mass analysis was considered to determine the syntan components. In addition, the effect of applications using syntan and syntan/cation in improving the stain resistance was observed. The optimum treatment condition of syntan was achieved and the major component of syntan, being exhausted to the nylon substrates, was determined. In terms of stain blocking effect, a significant improvement was achieved by the syntan and syntan/cation treatments.

Flexural Strength Testing of Topping Concrete base of Artificial Greening Layer based on Synthetic Macro Fiber Mixture Ratio (인공지반녹화 하부 누름콘크리트에 혼입되는 합성 매크로 섬유의 비율별 휨 성능 검토)

  • Han, Yoon Jung;Lee, Jung Hun;Song, Je Young;Jang, Duk Bae;Oh, Sang-Keun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2015.11a
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    • pp.38-39
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    • 2015
  • For the purpose of reducing defects (cracking) in topping concretes cast as artificial greening layer base, synthetic macro fibers were mixed. The flexural strength of synthetic macro fiber mixed topping concretes was tested via comparing its performance with current topping concrete. According to the results of the testing, topping concrete with adjusted mixing ratio after mixing with 1kg of synthetic macro fiber showed approximately 15% higher flexural strength compared to the current topping concrete.

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Effect of fibers and welded-wire reinforcements on the diaphragm behavior of composite deck slabs

  • Altoubat, Salah;Ousmane, Hisseine;Barakat, Samer
    • Steel and Composite Structures
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    • v.19 no.1
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    • pp.153-171
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    • 2015
  • Twelve large-scale composite deck slabs were instrumented and tested in a cantilever diaphragm configuration to assess the effect of fibers and welded wire mesh (WWM) on the in-plane shear capacity of composite deck slabs. The slabs were constructed with reentrant decking profile and reinforced with different types and dosages of secondary reinforcements: Conventional welded wire mesh (A142 and A98); synthetic macro-fibers (dosages of $3kg/m^3$ and $5.3kg/m^3$); and hooked-end steel fibers with a dosage of $15kg/m^3$. The deck orientation relative to the main beam (strong and weak) was also considered in this study. Fibers and WWM were found efficient in distributing the applied load to the whole matrix, inducing multiple cracking, thereby enhancing the strength and ductility of composite deck slabs. The test results indicate that fibers increased the slab's ultimate in-plane shear capacity by up to 29% and 50% in the strong and weak directions, respectively. WWM increased the ultimate in-plane shear capacity by up to 19% in the strong direction and 9% in the weak direction. The results suggest that discrete fibers can provide comparable diaphragm behavior as that with the conventional WWM.