Quasi-Static Cyclic Behavior of CFRP-Confined Geopolymeric Composites
Publication: Journal of Composites for Construction
Volume 27, Issue 6
Abstract
The utilization of geopolymeric composites can considerably promote sustainability in the construction sector due to their low carbon footprint. In this work, an experimental study was performed to investigate the quasi-static cyclic behavior of geopolymeric composites confined by carbon fiber-reinforced polymer (CFRP). In total, 40 CFRP-confined geopolymeric composite columns were fabricated and tested. The primary variables included the matrix composition (i.e., slag contents of 0% and 10%), type of confined material (i.e., mortar and concrete with recycled aggregate replacement ratios of 0%, 50%, and 100%), and the load pattern (i.e., cyclic loading with a single cycle and cyclic loading with repeated cycles). Careful examination and analysis of the experiment results led to a series of conclusions regarding failure patterns, stress–strain behaviors, and characteristics under ultimate conditions. In addition, discussions were provided concerning the effects of the primary variables on the key characteristics of the stress–strain curves, which included plastic strain, residual and reloading moduli, and stress deterioration for the envelope and internal cycles. In addition, the prediction results by the existing models for fiber-reinforced polymer (FRP)-confined conventional concrete were compared with the test results to assess their applicability for CFRP-confined geopolymeric composites.
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Data Availability Statement
All data, models, or codes that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors greatly acknowledge the financial support received from the National Natural Science Foundation of China (Grant No.11790283), the Natural Science Foundation of Hunan Province (2022JJ40615), Changsha Municipal Natural Science Foundation (kq2202099), and the Australian Research Council.
Notation
The following symbols are used in this paper:
- D
- diameter of concrete core;
- Ec
- elastic modulus of unconfined concrete;
- Efrp
- secant elastic modulus of FRP material;
- El
- lateral confinement stiffness;
- Ere
- reloading modulus;
- Eun,0
- residual modulus;
- ultimate axial compressive stress of FRP-confined concrete;
- peak axial compressive stress of unconfined concrete;
- ffrp
- ultimate tensile strength of FRP material;
- actual lateral confining pressure at ultimate condition;
- f30
- concrete strength of 30 MPa;
- n
- cycle number;
- ne
- effective cycle counter;
- tfrp
- thickness of FRP sheets;
- axial strain of unconfined concrete at ;
- ultimate axial strain of FRP-confined concrete;
- ultimate tensile strain of FRP material;
- hoop rupture strain of CFRP sheets;
- plastic strain;
- reloading strain;
- reference strain;
- unloading strain;
- envelope unloading strain;
- ϕn
- stress deterioration ratio for the nth unloading and reloading cycle;
- ρ
- confinement stiffness ratio;
- σnew
- stress on the reloading path at a reference strain ;
- σre
- reloading stress;
- σref
- stress on the previous reloading path at the reference strain ;
- σun,env
- envelope unloading stress; and
- ωn
- strain recovery ratio for the nth unloading and reloading cycles.
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Information & Authors
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Published In
Journal of Composites for Construction
Volume 27 • Issue 6 • December 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Sep 6, 2022
Accepted: Jul 11, 2023
Published online: Aug 28, 2023
Published in print: Dec 1, 2023
Discussion open until: Jan 28, 2024
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