• Title/Summary/Keyword: Polymer-reinforced

Search Result 1,244, Processing Time 0.028 seconds

Post-heating behavior of concrete beams reinforced with fiber reinforced polymer bars

  • Irshidat, Mohammad R.;Haddad, Rami H.;Almahmoud, Hanadi
    • Structural Engineering and Mechanics
    • /
    • v.53 no.6
    • /
    • pp.1253-1269
    • /
    • 2015
  • The present paper investigates the post heating behavior of concrete beams reinforced with fiber reinforced polymer (FRP) bars, namely carbon fiber reinforced polymer (CFRP) bars and glass fiber reinforced polymer (GFRP) bars. Thirty rectangular concrete beams were prepared and cured for 28 days. Then, beams were either subjected (in duplicates) to elevated temperatures in the range (100 to $500^{\circ}C$) or left at room temperature before tested under four point loading for flexural response. Experimental results showed that beams, reinforced with CFRP and GFRP bars and subjected to temperatures below $300^{\circ}C$, showed better mechanical performance than that of corresponding ones with conventional reinforcing steel bars. The results also revealed that ultimate load capacity and stiffness pertaining to beams with FRP reinforcement decreased, yet their ultimate deflection and toughness increased with higher temperatures. All beams reinforced with FRP materials, except those post-heated to $500^{\circ}C$, failed by concrete crushing followed by tension failure of FRP bars.

Engineering Properties of Carbon Fiber and Glass Fiber Reinforced Recycled Polymer Concrete (탄소섬유 및 유리섬유로 보강한 재생 폴리머 콘크리트의 공학적 특성)

  • Noh, Jin Yong;Sung, Chan Yong
    • Journal of The Korean Society of Agricultural Engineers
    • /
    • v.58 no.3
    • /
    • pp.21-27
    • /
    • 2016
  • This study was performed to evaluate engineering properties of carbon and glass fiber reinforced recycled polymer concrete. Fiber reinforced recycled polymer concrete were used recycled aggregate as coarse aggregate, natural aggregate as fine aggregate, $CaCO_3$ as filler, unsaturated polyester resin as binder, and carbon and glass fiber as fibers. The compressive and flexural strength of carbon fiber reinforced recycled polymer concrete were in the range of 68~81.5 MPa and 19.1~21.5 MPa at the curing 7days. Also, the compressive and flexural strength of glass fiber reinforced recycled polymer concrete were in the range of 69.4~85.1 MPa and 19~20.1 MPa at the curing 7days. Abrasion ratio of carbon and glass fiber reinforced recycled polymer concrete were decreased 21.6 % and 11.6 % by fiber content 0.9 %, respectively. After impact resistance test, drop numbers of initial and final fracture were increased with increase of fiber contents. Accordingly, carbon fiber and glass fiber reinforced recycled polymer concrete will greatly improve the hydraulic structures, underground utilities and agricultural structures.

A Study on the Lining of Reinforced Concrete Pipe Using Polymer-Modified Mortar (폴리머 시멘트 모르타르를 이용한 철근콘크리트 흄관 라이닝에 관한 연구)

  • 김영집;김한엽;조영구;소양섭
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2000.04a
    • /
    • pp.333-338
    • /
    • 2000
  • At present, reinforced concrete pipe has been widely used as drain pipe. However, many reinforced concrete pipe is exposed at deteriorated environment by the growth of a sulfur-oxidizing bacterium isolated from corroded concrete. The purpose of this study is to evaluate the effects of lining by polymer-modified mortar on the development in durability of reinforced concrete pipe. Polymer-modified mortars ate prepared with various polymer typer as cement modifier and polymer-cement ratio and rested for compressive and flexural strengths, adhesion in tension, acid resistance test, freezing and thawing test, and lining test of product in the field. From the rest results, it is apparent that polymer-modified mortars have good mechanical properties and durability as lining material. In practice, all polymers can be used as lining materials for reinforced concrete pip, and type of polymer, and polymer-cement ratio and curing conditions are controlled for good lining product.

  • PDF

Mechanical Behavior of Steel Fiber Reinforced Polymer-impregnated Concrete (강섬유보강 폴리머침투콘크리트의 기계적 성질에 관한 연구)

  • 변근주;송영철;정해성;정기영
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 1993.10a
    • /
    • pp.156-161
    • /
    • 1993
  • This paper is to develop steel fiber reinforced polymer-impregnated concrete(SFPIC) by impregnation polymer impregnate into hardened steel fiber reinforced concrete(SFRC). Steel fiber induces ductile behavior and polymer impregnant increase compressive strength. Steel fiber reinforced polymer-impregnated concrete specimens are prepared with fiber contents of 0.0, 1.5, 2.0, 2.5% and tested to obtain uni-axial and bi-axial compression strengths, tensile strength and flexural strength. The strength and mechanical properties of normal concrete, SFRC, SFPIC are compared.

  • PDF

Development of Bridge Expansion Joint for Fiber Reinforced Polymer Deck (FRP바닥판용 신축이음장치 개발)

  • Lee, Young-Ho;Park, Jong-Sup
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.8 no.2
    • /
    • pp.348-353
    • /
    • 2007
  • This paper presents design specifications and characteristics of bridge expansion joints to develop new type-joints in fiber reinforced polymer decks. Based on properties of the fiber reinforced polymer decks and fundamental process to calculate their expansion length, new expansion joints fur fiber reinforced polymer decks on typical steel or concrete girder are developed and proposed.

  • PDF

Plastic Shrinkage and Durability Characteristics of Fiber Reinforced Polymer-Modified Mortars (섬유보강 폴리머 시멘트 모르타르의 초기수축균열 및 내구특성)

  • Won Jong Pil;Jang Pil Sung;Kim Myeong Kyun;Kong Tae Woong
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2004.05a
    • /
    • pp.156-159
    • /
    • 2004
  • The intention of this study is to reduce the plastic shrinkage of the polymer modified cement mortar using the PVA fiber. The durability of PVA fiber reinforced polymer cement mortar was also evaluated. The test results of PVA fiber reinforced polymer modified cement mortar were compared with plain polymer modified cement mortar(non-fiber). In conclusion, PVA fiber reinforced polymer modified cement mortar showed an ability to reduce the total crack area and maximum crack width significantly. Also. fiber reinforced polymer modified cement mortar show improved durability performance.

  • PDF

Mechanical Behavior of Steel Fiber Reinforced Lightweight Polymer Concretese (강섬유보강 경량 폴리머 콘크리트의 역학적 거동)

  • Youn, Joon-No;Sung, Chan-Yong
    • Journal of The Korean Society of Agricultural Engineers
    • /
    • v.47 no.2
    • /
    • pp.63-72
    • /
    • 2005
  • In this study, the physical and mechanical properties of steel fiber reinforced lightweight polymer concrete were investigated experimentally with various steel fiber contents. All tests were performed at room temperature, and stress-strain curve and load-deflection curve were plotted up to failure. The unit weight of steel fiber reinforced lightweight polymer concrete was in the range of $1,020{\sim}1,160\;kg/m^3$, which was approximately $50\%$ of that of the ordinary polymer concrete, The compressive strength, splitting tensile strength, flexural toughness and flexural load-deflection curves after maximum load were shown with increase of steel fiber content. The stress-strain curves of steel fiber reinforced lightweight polymer concrete were bilinear in nature with a small transition zone, Based on these results, steel fiber reinforced lightweight polymer concrete can be widely applied to the polymer composite products.

Lining of Reinforced Spun Concrete Pipes using Polymer-Modified Mortars (폴리머 시멘트 모르타르를 이용한 원심력 철근콘크리트관의 라이닝)

  • 조영국
    • Journal of the Korea Concrete Institute
    • /
    • v.13 no.4
    • /
    • pp.406-413
    • /
    • 2001
  • Up to this day, reinforced spun concrete pipes have been widely used as drain pipes. However, many reinforced spun concrete pipes are exposed to the deteriorated environment such as freezing-thawing damage and chemical attack by the growth of a sulfur-oxidizing bacterium isolated from corroded concrete. The purpose of this study is to evaluate the effects of lining by polymer-modified mortar using polymer dispersions as cement modifier on the development in durability of reinforced spun concrete pipe. The polymer-modified mortars were prepared with various polymer types and polymer-cement ratios, and tested for compressive and flexural strengths, acid, freezing-thawing, and heat resistances. And then, the reinforced spun concrete pipe product lined by polymer-modified mortars was tested for adhesion in tension and surface conditions according to curing temperatures in the field. From the test results, it is apparent that the polymer-modified mortars have good mechanical properties and durability as a lining material. In practice, all polymers can be used as lining the materials for reinforced spun concrete pipe, and types of polymer, and polymer-cement ratio and curing conditions are controlled for a good lining product.

Mechanical Properties of Polymer Mortar Panel Reinforced by FRP (FRP 보강 폴리머 모르터 패널의 역학적 특성)

  • 유능환;연규석;김기성;이윤수;최동순
    • Proceedings of the Korean Society of Agricultural Engineers Conference
    • /
    • 1999.10c
    • /
    • pp.342-347
    • /
    • 1999
  • This study was initiated to develop a precast polymer concrete panel production method and to describe some engineering properties of FRP (Fiberglass Reinforced Plastics) reinforced polymer mortar. Specimens with different panel thickness and FRP reinforcement were prepared and tested and analyzed with respect to structural behaviors. Cracking moment was mostly affected by the thickness and reinforced FRP. Data of the study could be widely applied to the designing and planning of production processes of many polymer concrete products of which all or some of the components are composed with thin panels.

  • PDF

Performance of polymer concrete incorporating waste marble and alfa fibers

  • Mansour, Rokbi;El Abidine, Rahmouni Z.;Brahim, Baali
    • Advances in concrete construction
    • /
    • v.5 no.4
    • /
    • pp.331-343
    • /
    • 2017
  • In this study a polymer concrete, made up of natural aggregates and an orthophthalic polyester binder, reinforced with natural Alfa fibers has been studied. The results of flexural testing of unreinforced polymer concrete with different rates of charges (marble) showed that the concrete with 20% of marble is stronger and more rigid compared to other grades. Hence, a rate of 20% of marble powder is selected as the optimal value in the development of polymer concrete reinforced Alfa fibers. The fracture results of reinforced polymer concrete with 1 and 2 wt% of chopped untreated or treated Alfa fibers showed that treated Alfa (5% NaOH) fiber reinforced polymer concrete has higher fracture properties than other composites. We believe that this type of concrete provides a very promising alternative for the building industry seeking to achieve the objectives of sustainable development.