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Effect of bond enhancement using carbon nanotubes on flexural behavior of RC beams strengthened with externally bonded CFRP sheets

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Abstract

This paper studied the effect of incorporation of carbon nanotubes (CNTs) in carbon fiber reinforced polymer (CFRP) on strengthening of reinforced concrete (RC) beams. The RC beams were prepared, strengthened in flexure by externally bonded CFRP or CNTs-modified CFRP sheets, and tested under four-point loading. The experimental results showed the ability of the CNTs to delay the initiation of the cracks and to enhance the flexural capacity of the beams strengthened with CFRP. A nonlinear finite element (FE) model was built, validated, and used to study the effect of various parameters on the strengthening efficiency of CNTs-modified CFRP. The studied parameters included concrete strength, flexural reinforcement ratio, and CFRP sheet configuration. The numerical results showed that utilization of CNTs in CFRP production improved the flexural capacity of the strengthened beams for U-shape and underside-strip configurations. The enhancement was more pronounced in the case of U-shape than in the case of use of sheet strip covers on the underside of the beam. In case of using underside-strip, the longer or the wider the sheet, the higher was the flexural capacity of the beams. The flexural enhancement of RC beams by strengthening with CNTs-modified CFRP decreased with increasing the rebar diameter and was not affected by concrete strength.

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References

  1. Sai Krishna M, Sandeep Kumar G A V S, Cyril Thomas A. Behaviour of reinforced concrete beams bonded with side bonded FRP sheets. Materials Today: Proceedings, 2021, 43: 2404–2410

    Google Scholar 

  2. Hawileh R A, Musto H A, Abdalla J A, Naser M Z. Finite element modeling of reinforced concrete beams externally strengthened in flexure with side-bonded FRP laminates. Composites. Part B, Engineering, 2019, 173: 106952

    Article  Google Scholar 

  3. Ism M M, Rabie M. Flexural behavior of continuous RC beams strengthened with externally bonded CFRP sheets. Alexandria Engineering Journal, 2019, 58(2): 789–800

    Article  Google Scholar 

  4. Panahi M, Zareei S A, Izadi A. Flexural strengthening of reinforced concrete beams through externally bonded FRP sheets and near surface mounted FRP bars. Case Studies in Construction Materials, 2021, 15: e00601

    Article  Google Scholar 

  5. Abdalla J A, Mohammed A, Hawileh R A. Flexural strengthening of reinforced concrete beams with externally bonded hybrid systems. Procedia Structural Integrity, 2020, 28: 2312–2319

    Article  Google Scholar 

  6. Naser M Z, Hawileh R A, Abdalla J A. Fiber-reinforced polymer composites in strengthening reinforced concrete structures: A critical review. Engineering Structures, 2019, 198: 109542

    Article  Google Scholar 

  7. Siddika A, Mamun M A A, Alyousef R, Amran Y H M. Strengthening of reinforced concrete beams by using fiber-reinforced polymer composites: A review. Journal of Building Engineering, 2019, 25: 100798

    Article  Google Scholar 

  8. Abuodeh O R, Abdalla J A, Hawileh R A. Flexural strengthening of RC beams using aluminum alloy plates with mechanically-fastened anchorage systems: An experimental investigation. Engineering Structures, 2021, 234: 111969

    Article  Google Scholar 

  9. Zhou C Y, Yu Y N, Xie E L. Strengthening RC beams using externally bonded CFRP sheets with end self-locking. Composite Structures, 2020, 241: 112070

    Article  Google Scholar 

  10. Razaqpur A G, Cameron R, Mostafa A A B. Strengthening of RC beams with externally bonded and anchored thick CFRP laminate. Composite Structures, 2020, 233: 111574

    Article  Google Scholar 

  11. Irshidat M R, Al-Saleh M H, Almashagbeh H. Effect of carbon nanotubes on strengthening of RC beams retrofitted with carbon fiber/epoxy composites. Materials & Design, 2016, 89: 225–234

    Article  Google Scholar 

  12. Irshidat M R, Al-Saleh M H. Flexural strength recovery of heat-damaged RC beams using carbon nanotubes modified CFRP. Construction & Building Materials, 2017, 145: 474–482

    Article  Google Scholar 

  13. Douier K, Hawileh R A, Abdalla J A. Effect of U-wrap anchors on the strength and ductility of externally bonded RC beams with mortar bonded GSM sheets. Procedia Structural Integrity, 2020, 28: 986–993

    Article  Google Scholar 

  14. Lee J H, Lopez M M, Bakis C E. Slip effects in reinforced concrete beams with mechanically fastened FRP strip. Cement and Concrete Composites, 2009, 31(7): 496–504

    Article  Google Scholar 

  15. Mhanna H H, Hawileh R A, Abdalla J A. Shear behavior of RC T-beams externally strengthened with anchored high modulus carbon fiber-reinforced polymer (CFRP) laminates. Composite Structures, 2021, 272: 114198

    Article  Google Scholar 

  16. Smith S T, Hu S, Kim S J, Seracino R. FRP-strengthened RC slabs anchored with FRP anchors. Engineering Structures, 2011, 33(4): 1075–1087

    Article  Google Scholar 

  17. Kalfat R, Al-Mahaidi R. Investigation into bond behaviour of a new CFRP anchorage system for concrete utilising a mechanically strengthened substrate. Composite Structures, 2010, 92(11): 2738–2746

    Article  Google Scholar 

  18. Kharitonov A P, Tkachev A G, Blohin A N, Dyachkova T P, Kobzev D E, Maksimkin A V, Mostovoy A S, Alekseiko L N. Reinforcement of Bisphenol-F epoxy resin composites with fluorinated carbon nanotubes. Composites Science and Technology, 2016, 134: 161–167

    Article  Google Scholar 

  19. Korayem A H, Barati M R, Simon G P, Zhao X L, Duan W H. Reinforcing brittle and ductile epoxy matrices using carbon nanotubes masterbatch. Composites Part A: Applied Science and Manufacturing, 2014, 61: 126–133

    Article  Google Scholar 

  20. Li M, Gu Y, Liu Y, Li Y, Zhang Z. Interfacial improvement of carbon fiber/epoxy composites using a simple process for depositing commercially functionalized carbon nanotubes on the fibers. Carbon, 2013, 52: 109–121

    Article  Google Scholar 

  21. Feng Q P, Deng Y H, Xiao H M, Liu Y, Qu C B, Zhao Y, Fu S Y. Enhanced cryogenic interfacial normal bond property between carbon fibers and epoxy matrix by carbon nanotubes. Composites Science and Technology, 2014, 104: 59–65

    Article  Google Scholar 

  22. Rousakis T C, Kouravelou K B, Karachalios T K. Effects of carbon nanotube enrichment of epoxy resins on hybrid FRP-FR confinement of concrete. Composites. Part B, Engineering, 2014, 57: 210–218

    Article  Google Scholar 

  23. Soliman E, Kandil U F, Reda Taha M. Limiting shear creep of epoxy adhesive at the FRP-concrete interface using multi-walled carbon nanotubes. International Journal of Adhesion and Adhesives, 2012, 33: 36–44

    Article  Google Scholar 

  24. Irshidat M R, Al-Saleh M H, Al-Shoubaki M. Using carbon nanotubes to improve strengthening efficiency of carbon fiber/epoxy composites confined RC columns. Composite Structures, 2015, 134: 523–532

    Article  Google Scholar 

  25. Irshidat M R, Al-Saleh M H. Repair of heat-damaged RC columns using carbon nanotubes modified CFRP. Materials and Structures, 2017, 50(2): 162

    Article  Google Scholar 

  26. Irshidat M R, Al-Saleh M H. Effect of using carbon nanotube modified epoxy on bond-slip behavior between concrete and FRP sheets. Construction & Building Materials, 2016, 105: 511–518

    Article  Google Scholar 

  27. Chen G M, Teng J G, Chen J F, Xiao Q G. Finite element modeling of debonding failures in FRP-strengthened RC beams: A dynamic approach. Computers & Structures, 2015, 158: 167–183

    Article  Google Scholar 

  28. Hawileh R A, Naser M Z, Abdalla J A. Finite element simulation of reinforced concrete beams externally strengthened with short-length CFRP plates. Composites. Part B, Engineering, 2013, 45(1): 1722–1730

    Article  Google Scholar 

  29. Zhang S S, Teng J G. Finite element analysis of end cover separation in RC beams strengthened in flexure with FRP. Engineering Structures, 2014, 75: 550–560

    Article  Google Scholar 

  30. Hognestad E, Hanson N W, McHenry D. Concrete stress distribution in ultimate strength design. Journal Proceedings, 1955, 52(12): 455–480

    Google Scholar 

  31. William K J, Warnke E P. Constitutive Model for the Triaxial Behavior of Concrete. In: concrete structures subjected to triaxial stresses. Bergamo: ISMES, 1974

    Google Scholar 

  32. Lu X Z, Teng J G, Ye L P, Jiang J J. Bond-slip models for FRP sheets/plates bonded to concrete. Engineering Structures, 2005, 27(6): 920–937

    Article  Google Scholar 

  33. Choobbor S S, Hawileh R A, Abu-Obeidah A, Abdalla J A. Performance of hybrid carbon and basalt FRP sheets in strengthening concrete beams in flexure. Composite Structures, 2019, 227: 111337

    Article  Google Scholar 

  34. Yu B, Jiang Z, Tang X Z, Yue C Y, Yang J. Enhanced interphase between epoxy matrix and carbon fiber with carbon nanotube-modified silane coating. Composites Science and Technology, 2014, 99: 131–140

    Article  Google Scholar 

  35. Kim M T, Rhee K Y, Lee J H, Hui D, Lau A K T. Property enhancement of a carbon fiber/epoxy composite by using carbon nanotubes. Composites. Part B, Engineering, 2011, 42(5): 1257–1261

    Article  Google Scholar 

  36. Obaidat Y T, Heyden S, Dahlblom O. The effect of CFRP and CFRP/concrete interface models when modelling retrofitted RC beams with FEM. Composite Structures, 2010, 92(6): 1391–1398

    Article  Google Scholar 

  37. Al-Rousan R, Haddad R. NLFEA sulfate-damage reinforced concrete beams strengthened with FRP composites. Composite Structures, 2013, 96: 433–445

    Article  Google Scholar 

  38. Venkatesha K V, Dinesh S V, Rao K B, Bharatkumar B H, Balasubramanian S R, Iyer N R. Experimental investigation of reinforced concrete beams with and without CFRP wrapping. Slovak Journal of Civil Engineering, 2012, 20: 15–26

    Article  Google Scholar 

  39. Amaireh L K, Al-Tamimi A. Optimum configuration of CFRP composites for strengthening of reinforced concrete beams considering the contact constraint. Procedia Manufacturing, 2020, 44: 350–357

    Article  Google Scholar 

  40. Al-Rousan R Z. Effect of CFRP schemes on the flexural behavior of RC beams modeled by using a nonlinear finite-element analysis. Mechanics of Composite Materials, 2015, 51(4): 437–446

    Article  Google Scholar 

  41. Cosgun T. An experimental study of RC beams with varying concrete strength classes externally strengthened with CFRP composites. Journal of Engineered Fibers and Fabrics, 2016, 11(3): 155892501501000

    Article  MathSciNet  Google Scholar 

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Acknowledgments

The experimental part of the work was funded by the Scientific Research Support Fund, Amman, Jordan, under project EIT/1/12/2012.

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Author notes

  1. Mohammad R. Irshidat

    Present address: On leave at Center for Advanced Materials (CAM), Qatar University, Doha, 0000, Qatar

Authors and Affiliations

  1. Department of Civil Engineering, Jordan University of Science and Technology, Irbid, 22110, Jordan

    Mohammad R. Irshidat & Rami S. Al-Husban

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  1. Mohammad R. Irshidat
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  2. Rami S. Al-Husban
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Correspondence to Mohammad R. Irshidat.

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Irshidat, M.R., Al-Husban, R.S. Effect of bond enhancement using carbon nanotubes on flexural behavior of RC beams strengthened with externally bonded CFRP sheets. Front. Struct. Civ. Eng. 16, 131–143 (2022). https://doi.org/10.1007/s11709-021-0787-8

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  • DOI: https://doi.org/10.1007/s11709-021-0787-8

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