• Title/Summary/Keyword: Fiber Type

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A Experimental Study on the Flexural Behavior of Bundle Type Polyamide Fiber Reinforced Concrete (다발형 폴리아미드섬유 보강 콘크리트의 휨거동에 관한 실험적 연구)

  • Jeon, Chan Ki;Jeon, Joong Kyu
    • Journal of the Society of Disaster Information
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    • v.10 no.1
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    • pp.61-70
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    • 2014
  • Synthetic fiber reinforced concrete is applicable to many applications for construction material. In general, synthetic fibers have low tensile strength and elastic modulus, but they have many advantages such as high crack resistance, impact resistance, chemical resistance, flexural behavior and corrosion free in fiber reinforced concrete. Recently, fiber reinforced concrete with macro synthetic fibers has been used to improve performance of structures in tunnel shotcrete, precast segmental lining and bridge slab and precast concrete structures. This study investigated the influence of bundled type polyamide fiber reinforced concrete on the flexural behavior in accordance with ASTM C 1609 and KS F 2566 standards.

Mechanical Properties of the artificial Stone According to the Ternary System Inorganic Composite and Waste Glass and Fiber type (섬유의 종류에 따른 폐유리와 무기결합재 인조석재의 역학적 특성)

  • Yoo, Yong Jin;Kim, Heon Tae;Lee, Sang Soo;Song, Ha Young
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2013.05a
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    • pp.321-322
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    • 2013
  • Recently, the exhaustion of resource and environmental damage is serious due to the global warming because of the CO2 exhaust and each type the natural aggregate picking described below. meanwhile, The rest is the actual condition gone to the dumping ground that there is nearly no use which the waste glass can recycle and it is recycled. This research applied the waste glass as the cement substitute material the inorganic binder and coares aggregate substitute material. It utilizes the substitute material of the cement according to it and natural aggregate and tries to develop the environment-friendly artificial stone. The inorganic binder used the blast furnace slag, red mud, and fly ash. The straight type steel fiber, PVA fiber, PA fiber, and cellulosic fiber were used with a kind of fiber. As to the experimental item according to it, the compressive strength is the flexural strength and compressive strength.

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The Tendency Analysis of Korean Traditional Textile Studies (한국 전통 직물 연구의 경향 분석)

  • Choi, Seung-Yeun
    • The Research Journal of the Costume Culture
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    • v.19 no.1
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    • pp.19-30
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    • 2011
  • The purpose of this study is to analyze the tendency of Korean traditional textile studies to review the studies critically and to suggest the new directions. To do this, this study included 164 articles of Korean traditional textile studies published in five Korean major journals from the first issue to the 2009. The identified 164 articles were categorized and analyzed by five areas : study subject, study content, study method, the tendency through times and journals publishing Korea traditional textile articles. The results were as follows. First, in the study subject, the ratio of traditional motifs study was the highest in any other study subject and an actual textile pattern study and society culture historic study were also favored. And, the ratio of foreign textile study was the lowest in any other study subject. Second, in the fiber type of study content, the ratio of silk fiber was the highest in any other fiber type. Hemp, ramie and cotton fiber were followed by silk fiber. Also, the ratio of wool fiber was lowest in any other fiber type. In the weaving type, ratio of plain weave was the highest in any other weaving type. In the times of study, the ratio of the Joseon Dynasty period was the highest in any other times of study. Third, in the study method, the ratio of an actual proof study method was higher than that of literature study method. In the tendency of times, there were society culture historic studies from the time publishing the first edition in each journal, the ratio of an actual textile pattern study, traditional motif study and preservation science study has increased since the 2000. Fourth, in the characteristics of journals, Journal of Korean Society of Costume has published the most articles in any other journal publishing Korea traditional textile study.

Skin Biopsy: Emerging Method for Small Nerve Fiber Evaluation (피부조직검사: 소신경섬유 평가의 유용한 방법)

  • Sohn, Eun Hee
    • Annals of Clinical Neurophysiology
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    • v.17 no.2
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    • pp.53-60
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    • 2015
  • Skin biopsy with investigation of small nerve fiber in human epidermis and dermis has been proven to be a useful method for demonstration of small fiber neuropathy. Quantification of intraepidermal nerve fiber density using anti-Protein Gene Product 9.5 (PGP 9.5) antibody is standardized method to diagnose the small fiber neuropathy. Skin biopsy method also makes it possible to differentiate the type of nerve fibers by using different antibodies. Quantification of dermal structures with different type of nerve fibers could be used to invest pathophysiologic mechanism of diseased state.

Study on plain concrete crack reduction characteristics by fiber type (섬유보강재 종류에 따른 무근콘크리트 균열저감 특성에 관한 연구)

  • Lee, Ji-Hwan;Yun, Chang-Yeon;Park, Gi-Hong
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2022.04a
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    • pp.178-179
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    • 2022
  • This study evaluated the crack reduction characteristics of concrete by type of fiber reinforced concrete. As a result of the experiment, it was shown that the fluidity decreased due to the mixing of the fiber reinforcing material. The higher the amount of fiber reinforced material used, the higher the decrease in fluidity. It was confirmed that the tensile strength was improved by the mixing of the fiber reinforcing material. The selection of fiber reinforcement has a great influence on the crack reduction effect.

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A study on pull-out behaviours of shotcrete steel fibers according to different shapes (숏크리트 강섬유 형상에 따른 인발 거동에 대한 연구)

  • Kim, Sang-Hwan;Kim, Ji-Tae
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.13 no.1
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    • pp.71-82
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    • 2011
  • This paper presents the tensile strength of shotcrete steel fibers depending on the shape of steel fiber. The experimental and numerical analyses are performed in this study. In experimental study, a series of laboratory pullout tests are carried out by changing both the angle and the length of the embedded steel fiber according to the corresponding type of steel fiber in order to derive the optimal type of steel fiber. Results obtained from the experimental work are evaluated and compared with the numerical analysis results. The results clearly show that the pull-out strength of the steel fiber are increased with increasing the hook angle and embedded angle of steel fiber. It is also found that the pull-out strength of the steel fiber is larger in case of the short steel fiber body length.

Nonlinear Dynamic Properties of Fiber Reinforced Soils (섬유혼합토의 비선형 동적물성치)

  • 박철수;황선근;목영진
    • Journal of the Korean Geotechnical Society
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    • v.19 no.2
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    • pp.189-197
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    • 2003
  • In this paper, deformation characteristics of fiber-mixed-soils were studied at small strain range(0.0001%~1%) using resonant column test and triaxial test, and reinforcement effect was evaluated by the measure of maximum shear moduli. The effects of the major parameters such as fiber content, aspect ratio and fiber type on reinforcement were comparatively assessed. The specimens were remolded from Jumunjin Sand randomly mixed with discrete polypropylene staple fibers. Maximum shear moduli of fiber-mixed-soils increased by up to 30% and modulus reduction was also restrained in nonlinear range. Shear moduli increased as the aspect ratio increases. The reinforcement was more effective with fibrillated fiber than with monofilament fiber. The most effective reinforcement was achieved with the specimen of 0.3 % fiber content.

Fabrication of active cooling e-Textiles (스마트 의류용 전도성 직물의 제조 및 특성 분석)

  • Lee, Seung-A;Lee, Chang-Hwan;Kim, Ki-Tai;Kim, Joo-Yong
    • Textile Coloration and Finishing
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    • v.20 no.6
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    • pp.82-86
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    • 2008
  • Cooling function is definitely one of the most desirable attribute of clothing. In spite of the recent progress on phase changing material(PCM) research, the final products with sufficient amount of cooling capability have not yet to be developed in market. A new concept of cooling fabrics has been proposed by applying "Peltier effect" to textile materials. It occurs whenever electrical current flows through two dissimilar conductors; depending on the direction of current flow, the junction of the two conductors is absorbed or released heat. This effect has been tested on P-type and N-type conducting polymers. A P-type conductive polypyrrole coated fabric was synthesized by in-situ polymerization on plain weave PET to make conductive fabrics. And an N-type electrically conductive material was synthesized by treatment of MWNT and polyethyleneimine(PEI). A noticeable amount of temperature difference has been found on the fabrics.

A Study on The transducer of acoustic sensor to be Single-mode FBG using Hopper Type WDM be in the Making (Hopper type WDM을 이용한 단일모드 FBG(Fiber Bragg Grating)음향센서 트랜스듀서 개발연구)

  • Kim, Kyung Bok
    • Journal of the Institute of Electronics and Information Engineers
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    • v.51 no.10
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    • pp.256-263
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    • 2014
  • We have designed and made three kinds of FBG(Fiber Bragg Grating) Acoustic Transducer using Hopper type WDM on the use of recently developed FBG in Korea. The newly designed three kinds of FBG Acoustic Transducer using Hopper type WDM have an excellent merit of practical use with simple structure of sensors arm as well as the merit with existing fiber sensors. It was possible to detect sound waves in the range of 10 Hz to 18 kHz through the newly designed three kinds of FBG Acoustic Transducer and also, possible to detect its signal within the maximum range of 8.6 m by the use of most suitable resonance condition of the transducer. Especially, we can expect the utilization of low-frequency signal detection instead of existing acoustic sensor in the environment of electric noise and inferior condition. Furthermore, they can be developed as the high-sensibility and multi-point signal detection system through the sensor array system.

Durability and Fracture Toughness of Noncircular Type-Carbon Fiber Reinforced Cement Composites (비원형 단-탄소섬유 보강 시멘트 복합재의 내구성 및 파괴인성)

  • Lee, Young-Seak;Kim, Tae-Jin
    • Applied Chemistry for Engineering
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    • v.10 no.5
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    • pp.789-795
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    • 1999
  • In this study, carbon fiber reinforced cement composites(CFRCs) reinforced with short noncircular type carbon fibers were fabricated and properties(drying shrinkage, resistance to freezing and thawing, and fracture toughness) were compared with those of the CFRCs reinforced with circular type carbon fibers. It was found that these properties greatly depended on the shape and length of carbon fibers. The drying shrinkage of CFRCs reinforced with C-type carbon fiber was superior to other CFRCs. This effect was increased with a high aspect ratio of fiber. The resistance to freezing and thawing was increased with the fiber length and fiber volume percent, but there was on remarkable effect to fiber shape. Fracture toughness and resistance to crack propagation of CFRCs reinforced with C-CFs were improved compared with other CFRCs. It was believed that the more absorption of fracture energy into the larger interface caused an increase in fracture toughness and resistance to crack propagation.

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