Experimental Study of GFRP-Reinforced Geopolymer Concrete Columns under Different Loading Conditions
Publication: Journal of Composites for Construction
Volume 25, Issue 6
Abstract
This study discusses the behavior of ambient-cured circular geopolymer concrete specimens tested under different loading conditions. Twelve specimens were cast and tested to investigate the influence of the type of the reinforcement, that is, steel and glass fiber-reinforced polymer (GFRP), the pitch of the transverse reinforcement, and loading conditions (concentric axial load, 15 and 35 mm eccentric load, and four-point bending). The axial load carrying capacity, confinement efficiency, and deformability of the specimens decreased for the replacement of the steel reinforcement with the same amount of GFRP reinforcement under concentric and eccentric loads. However, the deformability of the GFRP reinforced concrete (RC) specimen was higher than the deformability of its steel counterpart specimen under four-point bending. Overall, the reduction in the pitch of the GFRP helices in the GFRP-RC specimens resulted in a significant improvement in the confinement efficiency, deformability, postpeak behavior, and the axial load–bending moment capacity of the specimens under different loading conditions. Moreover, theoretical equations based on the confinement pressure of transverse reinforcement provide accurate predictions of the theoretical load-carrying capacity of the columns reinforced with GFRP bars and helices.
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Data Availability Statement
All data used during the study appear in the published article.
Acknowledgments
The authors acknowledge the support of the technical officers of the High-Bay laboratory in the University of Wollongong, Australia, especially Mr. Fernando Escribano, Mr. Duncan Best, and Mr. Ritchie McLean in conducting the experimental work of this research. The authors are also thankful to the Australasian Slag Association and the Boral group of Companies, Wollongong, Australia for providing Ground granulated blast furnace slag and Fly ash, respectively. In addition, the authors thank Mr. Ian Cumming of MateenBar Australia for providing GFRP bars and helices for the experimental work of this study. Further, the second author acknowledge the Higher Education Commission Pakistan and the University of Wollongong for providing Ph.D. scholarship. In addition, the second author thank his family members for their support.
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Journal of Composites for Construction
Volume 25 • Issue 6 • December 2021
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© 2021 American Society of Civil Engineers.
History
Received: Oct 16, 2020
Accepted: Aug 6, 2021
Published online: Oct 4, 2021
Published in print: Dec 1, 2021
Discussion open until: Mar 4, 2022
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