Environmental Durability of FRP Bar-to-Concrete Bond: Critical Review
Publication: Journal of Composites for Construction
Volume 24, Issue 4
Abstract
Although fiber-reinforced polymer (FRP) materials are considered noncorrosive, the FRP bar surface resin has been shown to deteriorate when exposed to aggressive environments and this can result in a significant loss of bond strength with the surrounding concrete. To study the durability of the FRP bar-to-concrete bond, numerous investigations utilizing the FRP bar pull-out test arrangement have been conducted. These studies have, however, largely been considered in isolation without any systematic attempt to critically analyze the ever increasing pool of results based on variable exposure regimes and differing geometric and mechanical properties. To address this limitation, and to quantify the durability of the FRP bar-to-concrete bond, this paper presents an experimental database comprising 1,244 individual test results from 35 unique studies which were critically analyzed in terms of bond performance. The analysis highlighted the large scatter that exists for experimental results between studies and attempted to explain this scatter through discussion of the impact of exposure to material properties and the importance of sound experimental design.
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Acknowledgments
The authors would like to acknowledge the funding provided by ARC Linkage LP130100482 to carry out this research.
Notation
The following symbols are used in this paper:
- cy
- vertical distance of the outer surface of the concrete to FRP bar’s out-surface, mm;
- dfrp
- diameter of the FRP bar, mm;
- Efrp
- FRP bar modulus of elasticity along the longitudinal axis, GPa;
- fcb
- concrete cube compressive strength, MPa;
- fcyl
- concrete cylinder compressive strength, MPa;
- Kd
- rate of degradation of specimens subjected to the hygrothermal condition;
- Ks
- rate of degradation of the specimens subjected to the thermal condition;
- Lb
- embedment length of FRP bar in the concrete specimen, mm;
- t
- exposure duration, hours;
- tref
- exposure duration of a reference specimen, hours;
- T
- exposure temperature, °C;
- Tref
- control sample exposure temperature, °C;
- τ*
- normalized bond strength; and
- τ*ref
- normalized bond strength of the reference specimen.
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Journal of Composites for Construction
Volume 24 • Issue 4 • August 2020
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© 2020 American Society of Civil Engineers.
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Published online: Apr 24, 2020
Published in print: Aug 1, 2020
Discussion open until: Sep 24, 2020
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