GGBFS 콘크리트에 매립된 Notch를 가진 FRP Hybrid Bar의 부식저항성 평가
Evaluation of Anti-Corrosion Performance of FRP Hybrid Bar with Notch in GGBFS Concrete
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초록
콘크리트 구조물은 내구성과 경제성이 확보된 건설재료이지만, 매립된 철근의 부식은 내구적인 문제뿐 아니라 구조물의 안전성에 큰 영향을 준다. 본 연구는 유리섬유와 강재를 에폭시로 일체화 시킨 FRP Hybrid Bar를 적용한 콘크리트에 대해 염해 침투 저항성과 부식수준에 따른 부착성능을 평가하였다. 이를 위해 일반 강재를 적용한 OPC(Ordinary Portland Cement)시편과 GGBFS를 30% 혼입한 시편에 대하여 부식을 0~10% 촉진하여 부착력을 평가하였다. 또한 FRP Hybrid Bar는 에폭시 코팅으로 인해 보통 상태에서는 부식 진전이 매우 작으므로 notch를 인위적으로 가하여 OPC 콘크리트에 매립시켰으며, 이후 부식실험을 수행하였다. 실험 결과, 부식된 철근의 부착력이 21% 수준으로 감소해도 FRP Hybrid Bar에 발생된 notch는 부착력에 큰 영향이 없는 것으로 평가되었다. 또한 GGBFS 콘크리트를 사용한 부재의 경우, 통과전류가 감소하여 일반철근을 사용해도 70%이상의 부착력을 유지하고 있었다.
Abstract
Concrete structure is a construction material with durability and cost-benefit, however the corrosion in embedded steel causes a critical problem in structural safety. This paper presents an evaluation of chloride resistance and pull-off performance with various corrosion level. For the work, OPC(Ordinary Portland Cement) concrete and GGBFS(Ground Granulated Blast Furnace Slag) concrete are prepared with normal steel. Artificially notch induced FRP Hybrid Bar is also prepared and embedded in OPC concrete and accelerated corrosion test is performed. Through the test, FRP Hybrid Bar with notch is evaluated to have insignificant effect on pull-off capacity when corroded steel shows only 21% level of pull-off capacity. Furthermore GGBFS concrete with normal steel shows over 70% level of pull-off capacity due to reduced corrosion currency.
참고문헌 (27)
- "ACI Committee 440, Guide for the Design and Construction of concrete reinforce with FRP bars", ~ (2006)
- Ahmed, E. R., "Structural performance and Serviceability of Concrete Beams Reinforced with Hybrid (GFRP and Steel) Bars", Construction and Building Materials, 96, pp.519~529 (2015)
- Almusallam, T. H., "Load-deflection Behavior RC Beams Strengthened with GFRP Sheets Subjected to Different Environmental Conditions", Cement and Concrete Composites, 28, pp.879~889 (2006)
- Arribas, I., "Durability Studies on steelmaking slag concretes", Materials and Design, 63, pp.168~176 (2014)
- "ASTM C234-91a, Standard Test Method for Comparing Concretes on the Basis of the Bond Developed with Reinforcing Steel", American Society for Testing and Materials annual book of standards, ~ (1991)
- Bellezze, T., "Corrosion Behaviour in Concrete of Three Differently Galvanized Steel Bar", Cement and Concrete Composites, 28, pp.246~255 (2006)
- Broomfiled, J. P., "Corrosion of Steel in Concrete: Understanding, Investigation and Repair", pp.1~15 (1997), E&FN
- 최익창, "FRP Bar 보강 콘크리트 보의 전단거동", 해양환경안전학회지, 19(4), pp.403~409 (2013), 해양환경안전학회[DOI]
- Choi, O. C., "Performance Tests of Epoxy-Coated Reinforcing Bars : Mecharical Properties", Journal of the Korea Concrete Institute, 6(3), pp.173~179 (1994)
- 최세진, "부식된 FRP Hybrid Bar의 휨 내력 및 초음파 속도 특성", 한국콘텐츠학회 논문지, 15(8), pp.397~407 (2015), 한국콘텐츠학회[DOI]
- Chung, L., "Bond Strength Prediction for Reinforced Concrete Members with Highly Corroded Reinforcing Bars", Cement and Cocncrete Composites, 30(7), pp.603~611 (2008)
- Correia, J. R., "Flexural Behaviour of GFRP-Concrete Hybrid Beams with Interconnection Slip", Composite Structures, 77, pp.66~78 (2007)
- Hakan, Y., "An Experimental Study on the Bond Strength between Reinforcement Bars and Concrete as a Function of Concrete Cover, Strength and Corrosion Level", Cement and Concrete Research, 42(5), pp.643~655 (2012)
- KCI, "Design and Construction Guide of Concrete Structures with Reinforcement of FRP", Proceedings of the Korea Concrete Institute, 20(1), pp.67~ (2008), Korea Concrete Institute
- Development of Enhancing Life Span Technology for Waterfront Structures using FRP Hybrid Bar, "KICT", Korea Institute of Engineering and Building Technology, ~ (2013)
- 김은겸, "고로슬래그미분말을 사용한 콘크리트의 염화물이온에 의한 철근부식 저항성 연구", 콘크리트학회 논문집, 16(1), pp.1~9 (2004), 한국콘크리트학회
- 이승훈, "시간의존성 염화물 확산계수와 압축강도 상관성에 대한 실험적 연구", 콘크리트학회 논문집, 24(6), pp.715~726 (2012), 한국콘크리트학회[DOI]
- 이상수, "고로슬래그 미분말을 사용한 고성능 콘크리트의 역학특성 및 내구특성에 관한 실험적 연구", 대한건축학회논문집 구조계, 23(11), pp.119~126 (2007), 대한건축학회
- Mohammed, M., "A Comparative Study of Corrosion Resistance of Different Coatings for Mortar-Embedded Steel Plates", Construction and Building Materials, 56, pp.74~80 (2014)
- Oh, B. H., "An Experimental Study on Corrosion Resistance of Epoxy Coated Reinforcements", Journal of the Korea Concrete Institute, 4(4), pp.161~170 (1992)
- Sadegh, P. A., "Corrosion Protection of the Reinforceing Steels in Chloride-Laden Concrete Environment Through Expoy", polyniline-camphorsulfonate, 2015, pp.90, 239~247
- Sen, T., "Strengthening of RC Beams in Flexure using Natural Jute Fibre Textile Reinforced Composite System and its Comparative Study with CFRP and GFRP Strengthening Systems", International Journal of Sustainable Built Environment, 2(1), pp.41~55 (2013)
- Dong-Woo Seo, "Enhancement in Elastic Modulus of GFRP Bars by Material Hybridization", Engineering, 05(11), pp.865~869 (2013), Scientific Research Publishing, Inc,[DOI]
- 송하원, "고로슬래그 미분말 콘크리트의 염화물 침투 저항성에 관한 연구", 콘크리트학회 논문집, 15(3), pp.400~408 (2003), 한국콘크리트학회
- Ha-Won Song, "Vorhersage der Lebensdauer von Betontragwerken im Seeklima unter Berücksichtigung gekoppelter zerstörender Vorgänge", Service Life Prediction of Concrete Structures under Marine Environment Considering Coupled Deterioration, 2006, pp.12(4), ~[DOI]
- F. Tondolo, "Bond behaviour with reinforcement corrosion", Construction and Building Materials, 93, pp.926~932 (2015), Elsevier BV[DOI]
- Haixia Zhang, "Bond failure performances between near-surface mounted FRP bars and concrete for flexural strengthening concrete structures", Engineering Failure Analysis, 56, pp.39~50 (2015), Elsevier BV[DOI]