Bond Stress-slip Behaviour: The Case of GFRP Bars in Geopolymer Concrete

The use of geopolymer concrete reinforced with Fibre Reinforced Polymer (FRP) bars is anticipated to address the concerns on the usage of traditional reinforced concrete structures such as the corrosion of internal steel reinforcement, costly repair and rehabilitation, and development of sustainable infrastructures. To gain wide acceptance in the construction market, the bond between geopolymer concrete and FRP bar should be investigated first because it is a critical factor that influences the behaviour of structures, specifically its strength and long-term durability. In this study, the bond performance of sand-coated GFRP bars into geopolymer concrete with a compressive strength of 33 MPa was investigated under a direct pullout test. The effects of parameters such as bar diameter (12.7 mm, 15.9 mm, 19.0 mm) and embedment length (5db, 10db, 15db where db is the bar diameter) were evaluated. The results showed that the maximum average bond stress obtained is around 23 MPa. As GFRP bar diameter increases, the average bond stress decreases. Similarly, the average bond stress decreases as the bond length becomes longer. The specimens with shorter embedment length failed due to pullout of the bars while those with longer embedment lengths failed due to splitting of the concrete. The results further revealed that the geopolymer concrete reinforced with GFRP bars have bond strength similar to that of steel reinforced geopolymer concrete. Finally, bond-slip models for the ascending branch up to maximum bond stress of the bond-slip curves for GFRP bars and geopolymer concrete were proposed.

• Record URL:
  • https://doi.org/10.1061/(ASCE)MT.1943-5533.0001046
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/08991561
• Supplemental Notes:
  • © 2014 American Society of Civil Engineers.
• Authors:
  • Maranan, Ginghis
  • Manalo, Allan
  • Karunasena, Karu
  • Benmokrane, Brahim
• Publication Date: 2015-1

Language

• English

Media Info

• Media Type: Web
• Features: References;
• Serial:
  • Journal of Materials in Civil Engineering
  • Volume: 27
  • Issue Number: 1
  • Publisher: American Society of Civil Engineers
  • ISSN: 0899-1561
  • EISSN: 1943-5533
  • Serial URL: http://ascelibrary.org/journal/jmcee7

Subject/Index Terms

• TRT Terms: Bond strength (Materials); Corrosion; Durability; Fiber reinforced polymers; Material reinforcement; Reinforced concrete; Sand
• Subject Areas: Bridges and other structures; Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 01514796
• Record Type: Publication
• Files: TRIS, ASCE
• Created Date: Feb 21 2014 3:16PM