Performance of UHP-SWSSC-Filled CFRP and GFRP Tubes under Combined Sustained Load and Seawater Exposure
Publication: Journal of Composites for Construction
Volume 28, Issue 5
Abstract
This experimental investigation is the first of its kind to evaluate the effects of a combination of long-term loading and marine exposure on the structural response of carbon fiber–reinforced polymer (CFRP) and glass fiber–reinforced polymer (GFRP) tubular composites infilled with seawater and sea sand-based ultrahigh-performance concrete (UHP-SWSSC). The specimens were conditioned under natural seawater exposure at 40°C, 3,000 h of sustained loading, and a combination of the two. Long-term strains indicate that the composite tubes (especially GFRP) experienced swelling due to marine exposure, even under sustained load, suggesting gradual detachment of the tubes from the ultrahigh-performance concrete (UHPC) core. Considerable hoop strength and stiffness of the confining fiber-reinforced polymer (FRP) were necessary to restrain the dilation of UHPC, which was mechanically improved by sustained loading and seawater exposure. Lateral confining pressure and stiffness of FRP correlated with improved confined UHPC properties. The FRP tubes utilized their full material capacity only at a sufficiently high level of confinement to efficiently restrain the UHPC core. Despite the increase in compressive strength, marine exposure reduced the ductility of the FRP–UHPC composites, particularly in those containing GFRP. The gradual stress redistribution from the inner concrete to the outer FRP tubes facilitated better utilization of FRP confinements after creep (with or without seawater exposure).
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Data Availability Statement
Some or all data, models, or codes that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This project is supported by an Australian Research Council Discovery Project (DP160100739).
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Published In
Journal of Composites for Construction
Volume 28 • Issue 5 • October 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Oct 26, 2023
Accepted: Jun 7, 2024
Published online: Jul 26, 2024
Published in print: Oct 1, 2024
Discussion open until: Dec 26, 2024
ASCE Technical Topics:
- Carbon fibers
- Composite materials
- Concrete
- Design (by type)
- Engineering fundamentals
- Engineering materials (by type)
- Fiber reinforced composites
- Fiber reinforced polymer
- Fibers
- Glass fibers
- High-performance concrete
- Load factors
- Materials engineering
- Polymer
- Sea water
- Structural design
- Structural engineering
- Synthetic materials
- Water (by type)
- Water and water resources
- Water management
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