Journal of the Korea institute for structural maintenance and inspection (한국구조물진단유지관리공학회 논문집)

Korea Institute for Structural Maintenance Inspection (한국구조물진단유지관리공학회)
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Bond Capacity of Near-Surface-Mounted CFRP Plate to Concrete Under Various Temperatures

콘크리트에 표면매입 보강된 탄소섬유 판의 온도에 따른 부착성능

  • Received : 2013.03.06
  • Accepted : 2013.05.06
  • Published : 2013.07.30
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Abstract

This paper presents a series of test result in order to study fire resistance capacity of the Near-Surface-Mounted (NSM) Carbon Fiber Reinforced Polymer (CFRP) plate, which are tensile test of CFRP under various temperature loading, temperature loading test of epoxy and bond test of NSM CFRP to concrete under various temperature loading. From the tests, it was found that NSM retrofit method had high efficiency in strengthening concrete under ordinary temperature. However, the strength of the system was able to be drastically decreased even a little increase of surrounding temperature. Especially, bond capacity begins to disappear when the surrounding temperature approaches the glass transition temperature of epoxy. Therefore, it is necessary to improve the fire resistance capacity of both fiber reinforced polymer reinforcement and epoxy for bonding in order to develop safe fire resistance design of structure.

본 연구에서는 탄소섬유판을 이용하여 표면매입 보강된 철근콘크리트 부재의 내화성능에 관한 연구로서 온도변화에 따른 탄소섬유 판의 인장시험, 에폭시의 상태변화 실험, 그리고 온도변화에 따른 부착성능에 관한 일련의 실험연구를 실시하였다. 실험연구로부터, 부착강도의 측면에서 콘크리트를 보강하기 위한 효율적인 보강방법은 표면매입 보강이며, 이 보강법은 상온에서는 그 효과가 매우 높지만, 비록 낮은 온도일지라도 주변온도가 높아질 경우에는 보강효과가 현저히 저하될 수 있음을 확인하였다. 특히, 주변 온도가 에폭시의 화학적 성질이 변화하기 시작하는 유리전이 온도에 근접할 경우, 부착기능이 상실되기 시작하므로 구조물의 안전한 내화설계를 위해서는 부착용으로 사용되는 에폭시의 성능을 개선시키고 또한 섬유보강재의 성능개선이 시급한 것으로 사료된다.

Keywords

References

  1. ACI's 2011 Manual of Concrete Practice, Guide Test Methods for Fiber-Reinforced Polymers (ACI 440.3R), American Concrete Institute, Famington Hills, Mich., 2011.
  2. ACI's 2011 Manual of Concrete Practice, Report on Fiber- Reinforced Polymer (FRP) Reinforcement for Concrete Structures (ACI 440R-07), American Concrete Institute, Famington Hills, Mich., 2011.
  3. Blontrock, H., Taerwe, L., Vandevelde, P., Fire Testing of Concrete Slabs Strengthened with Fibre Composite Laminates. In The Fifth Annual Symposium on Fibre-Reinforced-Plastic Reinforcement or Concrete Structures (FRPRCS-5), Edited by C. Burgoyne, Thomas Telford, London, 2001, pp.547-556.
  4. Blontrock, H., Taerwe, L. and Matthys, S., "Properties of Fiber Reinforced Plastics at Elevated Temperatures with Regards to Fire Resistance of Reinforced Concrete Members", In: Fourth International Symposium on Metallic (FRP) Reinforcement for Concrete Structures, Baltimore, American Concrete Institute, 1999, pp.43-54.
  5. Moon, Do-Young, "Critical Temperature for Inter-Laminar Shear Strength and Effect of Exposure Time of FRP Rebars", Journal of Korea Concrete Institute, Vol. 25, No. 1, February, 2013, pp.45-51 (in Korean). https://doi.org/10.4334/JKCI.2013.25.1.045
  6. Katz, A. and Berman, N., "Modeling the Effect of High Temperature on the Bond of FRP Reinforcing bars to Concrete", Cem. Concr. Composites, Vol. 22, No. 6, 2000, pp.433-443. https://doi.org/10.1016/S0958-9465(00)00043-3
  7. Korea Technology Center, Method of Tensile Test for Metallic Materials, KS B 0802 : 2003, 2003.10.
  8. Chung, Lan and Park, Hyun Soo, "Structural Performance and Fire Resistance Capacity of Inorganic Polymer Composites for Carbon Sheets Exposed to High Temperature", Journal of Korea Concrete Institute, Vol. 10, No. 5, Oct., 1998, pp.45-51, pp.109-115.
  9. Foster, S. K. and Bisby, L. A., "Fire Survivability of Externally Bonded FRP Strengthening Systems", Journal of Composites for Construction, Vol. 12, No. 5, October 1, 2008, pp.553-561. https://doi.org/10.1061/(ASCE)1090-0268(2008)12:5(553)
  10. Seo, Soo-Yeon, Oh, Jae-Gil and Choi, Ki-Bong, "Bond Capacity of Concrete Member Strengthened by Various Methods Using FRP Plate", Journal of Architectural Institute of Korea, Vol. 27, No. 8, 2011. 8, pp.55-63 (in Korean).
  11. Seo, Soo-Yeon, "Bond Strength of Near-Surface-Mounted FRP Plate in RC Member", Journal of Korea Concrete Institute, Vol. 24, No. 4, 2012. 8, pp.415-422 (in Korean). https://doi.org/10.4334/JKCI.2012.24.4.415
  12. Seo, Soo-Yeon, Feo, Luciano and Hui, David, "Bond Strength of Near-Surface-Mounted FRP Plate for Retrofit of Concrete Structures", Composite Structures, Vol. 95, Jan. 2013, pp.719-727. https://doi.org/10.1016/j.compstruct.2012.08.038

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