Structural Engineering and Mechanics

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Experimental and numerical study of the behavior of fiber reinforced concrete beams with nano-graphene oxide and strengthening CFRP sheets

  • Mohammad Reza Halvaeyfar (Department of Civil Engineering, Arak Branch, Islamic Azad University) ;
  • Ehsanollah Zeighami (Department of Civil Engineering, Arak Branch, Islamic Azad University) ;
  • S. Mohammad Mirhosseini (Department of Civil Engineering, Arak Branch, Islamic Azad University) ;
  • Ali Hassani Joshaghani (Department of Chemical Engineering, Arak Branch, Islamic Azad University)
  • Received : 2023.04.26
  • Accepted : 2023.07.19
  • Published : 2023.08.25
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Abstract

In many fiber concrete beams with Carbon Fiber Reinforced Polymer (CFRP), debonding occurs between the carbon sheets and the concrete due to the low strength of the bonding resin. A total of 42 fiber concrete beams with a cross-section of 10×10 cm with a span length of 50 cm are fabricated and retrofitted with CFRP and subjected to a 4-point bending test. Graphene Oxide (GO) at 1, 2, and 3 wt% of the resin is used to improve the mechanical properties of the bonding resins, and the effect of length, width, and the number of layers of CFRP and resin material are investigated. The crack pattern, failure mode, and stress-strain curve are analyzed and compared in each case. The results showed that adding GO to polyamine resin could improve the bonding between the resin and the fiber concrete beam. Furthermore, the optimum amount of nanomaterials is equal to 2% by the weight of the resin. Using 2% nanomaterials showed that by increasing the length, width, and number of layers, the bearing and stiffness of fiber concrete beams increased significantly.

Keywords

References

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