• Title/Summary/Keyword: fiber-reinforced material

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Flexural and tensile properties of a glass fiber-reinforced ultra-high-strength concrete: an experimental, micromechanical and numerical study

  • Roth, M. Jason;Slawson, Thomas R.;Flores, Omar G.
    • Computers and Concrete
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    • v.7 no.2
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    • pp.169-190
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    • 2010
  • The focus of this research effort was characterization of the flexural and tensile properties of a specific ultra-high-strength, fiber-reinforced concrete material. The material exhibited a mean unconfined compressive strength of approximately 140 MPa and was reinforced with short, randomly distributed alkali resistant glass fibers. As a part of the study, coupled experimental, analytical and numerical investigations were performed. Flexural and direct tension tests were first conducted to experimentally characterize material behavior. Following experimentation, a micromechanically-based analytical model was utilized to calculate the material's tensile failure response, which was compared to the experimental results. Lastly, to investigate the relationship between the tensile failure and flexural response, a numerical analysis of the flexural experiments was performed utilizing the experimentally developed tensile failure function. Results of the experimental, analytical and numerical investigations are presented herein.

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 the Void Ratio and Permeability Coefficient Properties of fiber Reinforced Porous Concrete (섬유보강 포러스 콘크리트의 공극률과 투수계수 특성에 관한 연구)

  • Kim, Jeong-Hwan;Cho, Gwang-Yoen;Lee, Jun;Park, Seung-Bum
    • Proceedings of the Korea Concrete Institute Conference
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    • 2000.10a
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    • pp.677-682
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    • 2000
  • Porous concrete is defined as d type of concrete for which the fine aggregate component the matrix is entirely omitted. Although it had been used as a building material in Europe for over 60 years, low strength and high void ratio limited its application in the past. In recent years, however high void ratio of concrete has been recognized again and can be used as an environmental conscious material, for example, parking lots, draining light-traffic-volume pavements and as sea water purifying material. The result of an experiment on the void ratio of fiber reinforced porous concrete and its influence on the compressive strength and permeability relationship of concrete are reported in this paper. One-sized coarse aggregate of 5-10mm, and three absolute content of fiber(steel fiber, polyprophylen fiber) were used. The result of measured void ratio, permeability coefficient and compressive strength show a small variation. Void ratio, permeability coefficient and compressive strength of fiber reinforced porous concrete depend on contents of fiber and absolute volume ratios of paste to aggregate.

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Study on the Development of friction Material Using I-glass Fiber Reinforced Composites (유리섬유 강화 복합재료를 이용한 마찰재 개발에 관한 연구)

  • 김영운;최문호;서상하;김부안;문창권
    • Journal of Ocean Engineering and Technology
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    • v.14 no.4
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    • pp.49-55
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    • 2000
  • This study has been investigated to apply fiber reinforced composites instead of asbestos as a friction material. the reinforced used was E-glass fiber and binder resin was phenol having good mechanical properties and heat resistance. And it has been also investigated the effect of molding conditions and some additives such and carbon black, alumina and rubber powder in E-glass fiber/phenol resin composite on the friction on the friction and wear characteristics. As a result, it was found that the molding conditions of E-glass fiber/phenol resin composites for friction materials had to be different from those of phenol resin and was found that the wear rate of E-glass fiber/phenol resin composites added alumina powder was higher than of composites added carbon black in the same wear distance. And it was found that friction coefficient of E-glass/phenol resin composites added carbon black was decreased and that of the composites added the powder of natural rubber and ABS rubber were increased compared to the composites.

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Effect of Manufacturing Factors on Mechanical Properties of the Rice-husk Powder Composites (왕겨분말 복합재료의 기계적 특성에 미치는 제조인자의 영향)

  • Choi J.Y.;Wang Renliang;Yoon H.C.;Lim J.K.
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.30 no.7 s.250
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    • pp.794-799
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    • 2006
  • In recent years, the use of natural fiber as reinforcement in polymer composites to replace synthetic fiber such as glass fiber is receiving increasing attention. Because of increasing usage according to the high demand, the cost of thermoplastic has increased rapidly over the past decades. We used a thermoplastic polymer(polypropylene) as the matrix and a lignocellulosic material(rice-husk flour) as the reinforcement filler to prepare a particle-reinforced composite to examine the possibility of using lignocellulosic material as reinforcement filler and to determine data of test results for physical, mechanical and morphological properties of the composite according to the reinforcement filler content in respect to thermoplastic polymer, In this study, PLA/PP rice-husk fiber-reinforced thermoplastic composites that made by the hot press molding method according to appropriate manufacturing process was evaluated as mechanical properties.

A Study on the high-velocity impact resistance of fiber reinforced metal laminate materials (섬유강화 금속 적층 재료의 고속 충격 저항성에 관한 연구)

  • 손세원;김영태
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.1378-1381
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    • 2003
  • Recently, high-performance composite materials have been used for various industrial fields because of their superior high strength, high stiffness and lower weight. In this study, manufactured fiber reinforced metal laminate materials are composed of two parts. One is hard-anodized A15083-O alloy as a face material and the other is high strength aramid fiber (Twaron CT709) and polyethylene fiber(Dyneema HB25) laminates as a back-up material. Resistance to penetration is determined by protection ballistic limit(V$\sub$50/, a static velocity with 50% probability for complete penetration) test method. V$\sub$50/ tests with 0$^{\circ}$ obliquity at room temperature were conducted with 5.56mm ball projectiles that were able to achieve near or complete penetration during high velocity impact tests.

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Seismic behavior of SFRC shear wall with CFST columns

  • Gao, Dan-Ying;You, Pei-Bo;Zhang, Li-Juan;Yan, Huan-Huan
    • Steel and Composite Structures
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    • v.28 no.5
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    • pp.527-539
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    • 2018
  • The use of reinforced concrete (RC) shear wall with concrete filled steel tube (CFST) columns and steel fiber reinforced concrete (SFRC) shear wall has aroused widespread attention in recent years. A new shear wall, named SFRC shear wall with CFST columns, is proposed in this paper, which makes use of CFST column and SFRC shear wall. Six SFRC shear wall with CFST columns specimens were tested under cyclic loading. The effects of test parameters including steel fiber volume fraction and concrete strength on the failure mode, strength, ductility, rigidity and dissipated energy of shear wall specimens were investigated. The results showed that all tested shear wall specimens exhibited a distinct shear failure mode. Steel fibers could effectively control the crack width and improve the distribution of cracks. The load carrying and energy dissipation capacities of specimens increased with the increase of steel fiber volume fraction and concrete strength, whilst the ductility of specimens increased with the increase of steel fiber volume fraction and the decrease of concrete strength.

The Roles of Reinforcing Fibers on the Performance of Automotive Brake Pads (자동차용 마찰재의 성능에 미치는 강화섬유의 역할)

  • Lim, Hyun-Woo;Yoon, Ho-Gyu;Jang, Ho
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 2000.06a
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    • pp.173-179
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    • 2000
  • The friction and wear characteristics of brake friction materials reinforced with aramid fiber, carbon fiber, glass fiber, and potassium titanate whiskers were investigated using a pad-on-disk type friction tester. In particular, the morphology of rubbing surfaces was carefully investigated to correlate the friction performance and properties of transfer films. The aramid fiber reinforced specimen showed severe oscillation of friction coefficient at low speed and low applied pressure. The carbon fiber reinforced specimen showing better friction stability exhibited uniform and stable transfer film than any other specimens. The glass fiber reinforced specimen showed unstable friction changes at high speed and high-applied pressure and the non-uniform transfer film was observed in both friction material and rotor surface. The potassium titanate whiskers reinforced specimen showed stable coherent transfer film. The wear test exhibited the potassium titanate whiskers reinforced specimen was lowest in wear amount and glass fiber reinforced specimen showed the severe wear.

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Assessment of flexural performance of hybrid fiber reinforced concrete. (하이브리드 섬유보강 콘크리트의 휨성능 평가)

  • Kim, Hag-Youn;Kim, Nam-Ho;Park, Choon-Gun
    • Proceedings of the Korea Concrete Institute Conference
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    • 2005.05b
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    • pp.337-340
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    • 2005
  • In this study, an effect of fiber blending on material property of Hybrid Fiber Reinforced Concrete (HFRC) was evaluated. Also, Compare and evaluates collating and mechanical property by the mixing rate of fiber for HFRC was determine. Modulus of rupture and strength effectiveness of Hybrid Fiber Reinforced Concrete mixed with macro-fiber(steel fiber) and micro-fiber(glass fiber, carbon fiber, cellulose fiber). Test result shows, in the case of mono fiber reinforced concrete. As the steel fiber mixing rate increases to 1.5$\%$, the strength effectiveness promotion rate rises. However, when is 2.0$\%$, strength decreases. In the case of hybrid fiber reinforcement concrete, synergy effect of micro fiber and macro fiber happens and higher Modulus of rupture and strength effectiveness appears than mono-fiber reinforcement concrete. Use of hybrid fiber reinforcement in concrete caused a significant influence on its fracture behavior; consequently, caused increase by mixing rate of steel fiber + carbon fiber and contributed by steel fiber + glass fiber, steel fiber + celluloid fiber in reinforcement effect in order. And was expose that steel fiber(1.5$\%$) + carbon fiber(0.5$\%$) is most suitable association.

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Damping determination of FRP-confined reinforced concrete columns

  • Li, Xiaoran;Wang, Yuanfeng;Su, Li
    • Computers and Concrete
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    • v.14 no.2
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    • pp.163-174
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    • 2014
  • Damping as a material property plays an important role in decreasing dynamic response of structures. However, very little is known about the evaluation and application of the actual damping of Fiber Reinforced Polymer Confined Reinforced Concrete (FRP-C RC) material which is widely adopted in civil engineering at present. This paper first proposes a stress-dependent damping model for FRP-C RC material using a validated Finite Element Model (FEM), then based on this damping-stress relation, an iterative scheme is developed for the computations of the non-linear damping and dynamic response of FRP-C RC columns at any given harmonic exciting frequency. Numerical results show that at resonance, a considerable increase of the loss factor of the FRP-C RC columns effectively reduces the dynamic response of the columns, and the columns with lower concrete strength, FRP volume ratio and axial compression ratio or higher longitudinal reinforcement ratio have stronger damping values, and can relatively reduce the resonant response.