• Title/Summary/Keyword: fiber-reinforced material

Search Result 1,161, Processing Time 0.021 seconds

A Study on the Shear Strengthening Effect of Reinforced Concrete Beams with Structural Damage (구조적 손상을 입은 철근콘크리트 보의 전단보강 효과에 관한 연구)

  • Shin, Yong-Seok;Kim, Jeong-Hoon;Kim, Jeong-Sup;Kim, Kwang-Seok;Cho, Cheol-Hee
    • Journal of the Korea Institute of Building Construction
    • /
    • v.8 no.5
    • /
    • pp.43-51
    • /
    • 2008
  • This study examines shear capacity performance and structural characteristics of reinforced concrete beam using carbon fiber sheet(CFS), g)ass fiber sheet(GFS), glass fiber steel plate(GSP) and carbon fiber bar CB) which are reinforcing materials for reinforced concrete beam in order to produce similar condition to repair and reinforce actual structure and aims to provide data available In designing and constructing reinforced concrete structures under the structural damage. This study obtains the following conclusions. After considering the shear experiment results. it was indicated that the CB reinforced test object was the best in the shear capacity improvement and ductility capacity as it was contained in the concrete and was all operated, Also, GFS reinforced test object indicated the reduced flexural capacity but good shear capacity. GSP reinforced test object had bigger reinforcing strength than other reinforcing test objects. On the other hand, it showed the lowest reinforcement effect as compared section thickness of reinforced material because it showed the bigger relativity a section thickness of reinforced material. If the adherence to the concrete is improved, it will seem to show bigger reinforcement effect.

Shear Performance of Glass Fiber Reinforced Glulam Bolted Connection

  • Kim, Keon-ho;Hong, Soon-il
    • Journal of the Korean Wood Science and Technology
    • /
    • v.43 no.5
    • /
    • pp.661-671
    • /
    • 2015
  • To evaluate the shear performance of the textile glass fiber and the sheet glass fiber reinforced glulam bolted connections, a tension type shear test was conducted. The average yield shear strength of the bolted connection of reinforced glulam was increased by 12% ~ 31% compared to the non-reinforced glulam. It was confirmed that the shear performance of 5D end distance of the glass fiber reinforced glulam connection corresponds to that of 7D of the non-reinforced glulam connection proposed in building design requirements in various countries. Compared to the non-reinforced glulam, the average shear strength of textile glass fiber reinforced glulam was markedly increased. The non-reinforced glulam and the GFRP reinforced glulam underwent a momentary splitting fracture. However, the failure mode of textile glass fiber reinforced glulam showed a good ductility.

Effect of Fiber Blending on Material Property of Hybrid Fiber Reinforced Concrete (섬유 혼입 비율에 따른 하이브리드 섬유보강 콘크리트의 재료특성)

  • Kim, Hag-Youn;Seo, Ki-Won;Lee, Wok-Jae;Kim, Nam-Ho;Park, Choon-Gun
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2004.11a
    • /
    • pp.345-348
    • /
    • 2004
  • In this study, an effect of fiber blending on material property of hybrid fiber reinforced concrete (HFRC) was evaluated. Also, optimized association and the mixing rate of fiber for HFRC was determined. Test result shows, in the case of mono fiber reinforced concrete, use of steel fiber in concrete caused increment in tensile and bending strength as the blended ratio increases, while use of carbon fiber and glass fiber caused increment in compressive strength. Use of hybrid fiber reinforcement in concrete caused a significant influence on its fracture behavior; consequently, caused increase by mixing rate of steel fiber and contributed by carbon fiber, glass fiber, celluloid fiber in reinforcement effect in order.

  • PDF

Comparison between fiber-reinforced polymers and stainless steel orthodontic retainers

  • Lucchese, Alessandra;Manuelli, Maurizio;Ciuffreda, Claudio;Albertini, Paolo;Gherlone, Enrico;Perillo, Letizia
    • The korean journal of orthodontics
    • /
    • v.48 no.2
    • /
    • pp.107-112
    • /
    • 2018
  • Objective: The aim of this study was to examine the properties of fiber-reinforced composite and stainless steel twisted retainers for orthodontic retention. Methods: Three different span lengths (5.0, 8.0, and 14.0 mm) of fiber-reinforced composite were investigated. The three fiber-reinforced composite retainer groups were subdivided according to the storage condition (dry and wet), resulting in a total of six groups. Each stainless steel and fiber-reinforced composite group was comprised of six specimens. The three-point bending flexural test was conducted using a universal testing machine. ANOVA was used to assess differences in the maximum load and maximum stress according to the span length, material, and storage condition. Post-hoc comparisons were performed if necessary. Results: The maximum stress and maximum load were significantly (p < 0.001) associated with the span length, material, and storage condition. The significant interaction between the material and span length (p < 0.001) indicated the differential effects of the material for each span length on the maximum stress and maximum load, with the difference between materials being the highest for the maximum span length. Conclusions: Our findings suggest that fiber-reinforced composite retainers may be an effective alternative for orthodontic retention in patients with esthetic concerns or allergy to conventional stainless steel wires.

A Study on the Improvement of Workability of High Strength Steed Fiber Reinforced Cementitious Composites (고강도 강섬유 보강 시멘트 복합체의 워커빌리티 향상에 관한 연구)

  • Koh, Kyung-Taeg;Kang, Su-Tae;Park, Jung-Jun;Ryu, Gum-Sung
    • Journal of the Korea institute for structural maintenance and inspection
    • /
    • v.8 no.3
    • /
    • pp.141-148
    • /
    • 2004
  • This paper present the experimental research investigating the influence of material factors such as a type or amount of superplasticizer, velocity agent, mineral admixture and steel fiber on the workability of high strength steel fiber reinforced cementitious composites. As for the test results, it was found that the workability of high strength steel fiber reinforced cementitious composites can be improved when the material factors were matched properly in amount and composition. Furthermore, it was shown that the smaller value of the aspect ratio of steel fiber improved the workability of fiber reinforced cementitious composites. And the steel fiber reinforced cementitious composites with better workability showed the enhanced compressive strength and flexural strength.

A Study on Carbon Fiber Sheet Rehabilitation of Reinforced High Strength Concrete Beams (고강도 RC보의 탄소섬유쉬트 보강에 대한 연구)

  • 김종효;곽계환
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 1997.10a
    • /
    • pp.450-455
    • /
    • 1997
  • In recent years the research and development about the new material proceeds rapidly and actively in building industry. We are concerned with high-strength concrete as a new material. As the building structure becomes bigger, higher and more specialized, so does the demand of material and member with high strength for building expands greatly. In the future, we will quite need to research repair and rehabilitation to make high strength concrete structural building for our safe. So, I did an study on carbon fiber sheet rehabilitation(CFSR) of reinforced high strength concrete beams. The carbon fiber reinforced plastic(CFRP) bonding method is widely used for reinforcing the existing concrete structure among the various methods. The test results indicate that CFS is very effective for strengthening the damaged beams and controlling deflections of the repaired beams. When carbon fiber sheet rehabilitation of reinforced high strength concrete beams happened diagonal crack, the increase in the number of CFS layer didn't effect the increase in strength of beams. Also, by changing the CFS stick position gave diversified ultimate load in CFSR beams.

  • PDF

The Material Characteristics of Steel Fiber Reinforced Polymer Concrete (강섬유 보강 폴리머 콘크리트의 재료적 특성)

  • 김기락
    • Magazine of the Korean Society of Agricultural Engineers
    • /
    • v.41 no.3
    • /
    • pp.73-80
    • /
    • 1999
  • The objective of this study were to investigate the properties and to improve the disadvantages of the polymer concrete such as brittle fracture, large hardening shrinkage . In this paper, steel fiber reinforced polymer concrete is prepared with various steel fiber aspect ratios(ι/d), contents(vol.%), and their material characteristics were investigated experimentally . The aspect ration (ι/d) of the steel fiber was reversly proportional to slump value, and slump value tended to decrease as increase of steel fiber content . And harding shrinkage and impact resistance tended to be improved as the steel fiber content and aspect ration were increased.

  • PDF

An Experimental Study on the Characteristics of Fiber-Reinforced Concrete Beam Without Shear Reinforcement (전단보강근이 없는 섬유보강 철근콘크리트 보의 특성에 관한 실험적 연구)

  • Kim, Jeong-Sup;Go, Song-Kyoon;Choi, Jin-Seok
    • Journal of the Korea Institute of Building Construction
    • /
    • v.3 no.3
    • /
    • pp.83-90
    • /
    • 2003
  • This study examines the material characteristics of fibers and their influences on reinforced concrete through the tests of reinforced concrete by the types of fibers including non-reinforced, steel, polypropylene and cellulose fibers and the test of compressive strength and reinforced concrete beam without shear reinforcement and consequently it obtains the following conclusions. As a result of conducting compressive strength by the types of specimens, fiber reinforced specimen with the highest compressive strength value at 28 days of age was cellulose fiber reinforced specimen as 280.4kgf/$\textrm{cm}^2$ and steel fiber specimen had the highest compressive strength of 250.7kgf/$\textrm{cm}^2$ at 180 days of age. In case of non-reinforced specimen, its compressive strength was 277.4kgf/$\textrm{cm}^2$ at 28 days of age and 273.1kgf/$\textrm{cm}^2$ at 180 days of age. Comparing the compressive strength of non-reinforced specimen to that fiber reinforced specimen showed that the compressive strength of fiber reinforced specimen was lower in the passage of age and the results of this experiment showed no effects of fiber reinforcement. As a result of testing reinforced concrete beam without shear reinforcement, ductility factors of specimens were 4.67 for non-reinforced specimen, 8.18 for steel fiber reinforced specimen, 6.20 for polypropylene fiber reinforced specimen and 5.49 for cellulose reinforced specimen, and it is found that steel fiber reinforced specimen was highest. When non-reinforced specimen and steel fiber reinforced specimen were compared, steel fiber reinforced specimen had higher ductility factor of about 75.2% than that of non-reinforced specimen.

Mechanical properties of natural fiber-reinforced normal strength and high-fluidity concretes

  • Kim, Joo-Seok;Lee, Hyoung-Ju;Choi, Yeol
    • Computers and Concrete
    • /
    • v.11 no.6
    • /
    • pp.531-539
    • /
    • 2013
  • An experimental investigation of mechanical properties of jute fiber-reinforced concrete (JFRC) has been reported for making a suitable construction material in terms of fiber reinforcement. Two jute fiber reinforced concretes, called jute fiber reinforced normal strength concrete (JFRNSC) and jute fiber-reinforced high-fluidity concrete (JFRHFC), were tested in compression, flexure and splitting tension. Compressive, flexural and splitting tensile strengths of specimens were investigated to four levels of jute fiber contents by volume fraction. From the test results, Jute fiber can be successfully used for normal strength concrete (NSC) and high-fluidity concrete (HFC). Particularly, HFC with jute fibers shows relatively higher improvement of strength property than that of normal strength concrete.

An Experimental Study on the Strength Characteristics of Fiber-Reinforced Concrete Beam (섬유보강 철근콘크리트 보의 강도특성에 관한 실험적 연구)

  • Kim, Jeong-Sup;Park, Young-Bae
    • Journal of the Korea Institute of Building Construction
    • /
    • v.3 no.1
    • /
    • pp.85-91
    • /
    • 2003
  • This study aims to provide basic data that can be applied to construct real structures. For this, an experimental structure was manufactured to identify durability according to age of fiber-reinforced concrete which contains fiber reinforcement materials (polypropylene fiber, steel fiber, cellulose fiber) and structural property about flexural behavior and destruction of reinforced concrete beam, and a relation between load and deflection, crack and destruction according to increase of load and ductility capacity was examined. Fiber-reinforced concrete materials and other constructional materials were experimented and the result is presented as follows: The results obtained through material test of concrete and static experiment of members usings 1. The experiment shows that compressive strength of fiber-reinforced concrete was lower than that of non-reinforced concrete. 2. As a result of strength experiment according to different kinds of fiber, compressive strength of an experimented structure that contains cellulose fiber was the highest when age was 28. 3. When deflection of reinforced concrete beam was examined, it was reported that ductility capacity of the experimented structure that contains fiber-reinforced concrete was raise than that of non-reinforced concrete.