DOI QR코드

DOI QR Code

Resistance of Chloride Penetration of Fiber Reinforced Concrete Under Loading Condition

하중이 작용하는 환경에서의 섬유보강콘크리트의 염분침투저항성

  • 배용환 (동명대학교 건축대학 건축공학과) ;
  • 임남기 (동명대학교 건축대학 건축공학과)
  • Received : 2012.01.04
  • Published : 2012.03.25

Abstract

In this study, we investigated the resistance of chloride penetration in five types of concretes mixing PP and PVA fibers with different length and mixing rate under loading conditions. These fibers, which are organic fibers of widely used as a composite material, have different values in elastic coefficient and tensile strength. As a result of comprehensive estimation, we conclude as follows: Tensile strengths of PP and PVA fibers reinforced concretes showed higher than those of OPC. This results suggest the improvement of tensile strengths by mixing PP and PVA fibers. Additionally, these reinforced concretes had maximum strengths at mixing rate of 0.1% in both two fibers. Diffusion coefficients of PP and PVA fibers reinforced concretes under tensile stress conditions were largely increased with increasing stress. However, in the case of PP and PVA fibers, the rate of increase of diffusion coefficients could be effectively controlled in low stress steps by mixing concrete with those fibers of 0.1% contents. Regardless of the type of fiber, the most effective behavior of chloride penetration were confirmed at mixing rate of 0.1% in the absence of tensile loading conditions. On the other hand, diffusion coefficients of OPC and fibers reinforced concretes were all increased with increasing stress in high stress steps of more than Rt=40%. This means that the estimation considering loading conditions is very important for the resistance of chloride penetration. PVA fiber reinforced concretes could effectively control the rate of increase of diffusion coefficient as compared to PP fiber. This result supposes that the mixture of fiber with high elastic coefficient and tensile strength is more effective for the behavior of chloride penetration under loading conditions. PVA fiber reinforced concretes could effectively control the rate of increase of diffusion coefficient as compared to PP fiber. This result supposes that the mixture of fiber with high elastic coefficient and tensile strength is more effective for the behavior of chloride penetration under loading conditions.

Keywords

References

  1. Dong Hun Kim, Kazunori Shimura, Takashi Horiguchi, "Effect of Tensile loading on the Chloride Penetration of Con crete Mixed with Granulated Blast Furnace Slag", Journal of Advanced Concrete Technology. Feb;8(1):27-34, 2010 https://doi.org/10.3151/jact.8.27
  2. 迫井裕樹, 川北昌宏, 堀口 敬, "フライアッシュおよび高爐スラグ微粉末を混入したコンクリートの塩分浸透性に及ぼす壓縮 応力の影響", コンクリート工學論文集, Vol.18, No.3, 2007.9
  3. 堀口至, 佐伯昇, 志村和紀, 堀口敬, "長短の繊維 で補強 した コンクリートの浸透性", コンクリート工學年次論文集, Vol.22, No.2, 2000
  4. 堀口至, 佐伯昇, 堀口敬, 志村和紀, "長さの異なる鋼繊維を混 入したコンクリートの水密性", コンクリート工學年次論文集, Vol.23, No.2, 2001
  5. AASHTO T 277-89, Rapid Determination of the Chloride Permeability of Concrete, American Association of State H ighway and Transportation Officials, 1989
  6. Nordtest NT BUILD 492, Chloride Migration Coefficient from Non-Steady State Migration Experiment, Finland, 1999
  7. Kim Dong-Hun, Staneva Petia, Lim Nam-Gi, "Evaluation of Fiber and Blast Furnace Slag Concrete Chloride Penetra tion by Computer Simulation", Journal of the korea instit ute of building conctruction, ogy. Vol.11, No.4, 2011
  8. 金東勲, 林楠基, 堀口 敬, "高爐スラグ微粉末を混入したコン クリートの塩分浸透性に及ぼす荷重の影響", 日本建築學會構造系論文集, 第74巻 第645号, 2009
  9. 김동훈, 임남기, 호리구치 다카시, "고로슬래그미분말을 혼입한 콘크리트의 염분침투성에 미치는 압축하중의 영향", 한국건축시공학회 논문집 제9권 6호, 2009
  10. Mitsuru Saito, "Characteristics of Microcracking in Concrete under Static and Tensile Loading", Cement and Concrete Research, Vol.17,1987
  11. J.S.Lawler, T.Wilhelm, D.Zampim, S.P.Shah, "Fracture Processes of Hybrid Fiber Reinforced Mortar, Materials and Structures", Vol.36, 2003
  12. Kohei Nagai, Yasuhiko Sato, Tamon Ueda, "Mesoscopic Simulation of Failure of Mortar and Concrete by 2D RBSM", Journal of Advanced Concrete Technology Vol.2, NO3, 2004