Bond Stress-Slip Behavior: Case of GFRP Bars in Geopolymer Concrete
Publication: Journal of Materials in Civil Engineering
Volume 27, Issue 1
Abstract
The use of geopolymer concrete reinforced with fiber-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 the FRP bar should be investigated first because it is a critical factor that influences the behavior of structures, specifically its strength and long-term durability. In this study, the bond performance of sand-coated glass fiber-reinforced polymer (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, 15.9, and 19.0 mm) and embedment length (5, 10, and 15 , where 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 because of pullout of the bars, whereas those with longer embedment lengths failed because the concrete split. The results further revealed that the geopolymer concrete reinforced with GFRP bars have a 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.
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Acknowledgments
The authors gratefully acknowledge V-Rod Australia for the materials and technical support they had given in the conduct of this research undertaking.
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Published In
Journal of Materials in Civil Engineering
Volume 27 • Issue 1 • January 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Dec 3, 2013
Accepted: Jan 30, 2014
Published online: Jan 31, 2014
Discussion open until: Dec 11, 2014
Published in print: Jan 1, 2015
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