Mechanical and bond properties of new generation of isorod CFRP reinforcing bars for concrete structures

  • Benmokrane B
  • Zhang B
  • Laoubi K
 et al. 
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Abstract

This report presents laboratory test results on the mechanical properties and bond strength of new generation of Carbon Fibre Reinforced Polymer (CFRP) Isorod reinforcing bars used as nonprestressed reinforcement for concrete structures. The CFRP reinforcing bar has a 9.5-mm diameter with sand-coated surface deformation. Five embedment lengths were selected for the pullout bond tests. Tensile tests and pullout bond tests were conducted to evaluate the tensile properties and bond strength of the CFRP bar in comparison with that of the steel bar. Experimental results showed that the tensile stress-strain curves of the CFRP bar were linear up to failure. The ultimate tensile strength of the CFRP bar was at least 1500 MPa, 3 times that of steel bars. The modulus of elasticity of the CFRP bar was 128 GPa, about 65% that of steel. Furthermore, the CFRP bar exhibited almost the same bond strength to concrete as 11.3-mm-diameter steel bars. The minimum bond development length of the CFRP bar seemed to be equal to about 20 db, where db is the nominal diameter of the bar.

Author-supplied keywords

  • bar
  • bond strength
  • carbon FRP (CFRP)
  • concrete structures
  • embedded length
  • fibre reinforced polymer (FRP)
  • mechanical properties
  • pullout
  • tensile strength

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Authors

  • Brahim Benmokrane

  • Burong Zhang

  • Kader Laoubi

  • Brahim Tighiouart

  • Isabelle Lord

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