Predictive Framework for FRP-Concrete Corrosion Repair
Publication: Journal of Composites for Construction
Volume 24, Issue 6
Abstract
Fiber-reinforced polymers (FRPs) have been used for repairing chloride-induced corrosion in steel for more than 40 years. Since FRP is a barrier element, it cannot stop electrochemical reactions responsible for corrosion of steel in concrete. The effect of ongoing corrosion can only be detected by inspectors after it has reached such an advanced state that rust stains become visible. This paper presents a predictive framework to estimate the rate of chloride-induced corrosion inside an FRP-concrete repair. Statistical methods were used to extend experimental data on oxygen permeation for one- and two-layer configuration to multilayer configurations. The model was calibrated by comparing its prediction against measured metal loss in specimens repaired using one to four FRP layers that were kept outdoors and subjected to simulated tidal cycles for longer than three years. The application of the model is illustrated by a numerical example.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors gratefully acknowledge the review and advice of Prof. Dr. Kandethody Ramachandran on the statistical analyses. Special thanks to Dr. Kwangsuk Suh for providing data from his testing in excel format.
Notation
The following symbols are used in this paper:
- A
- area that oxygen moles diffuse through;
- CEW
- environment and workmanship correction factor;
- e
- 2.718281828;
- L
- number of FRP layers;
- M
- moles of oxygen;
- N
- oxygen permeation rate;
- P
- oxygen permeation;
- Pconcrete
- concrete oxygen permeation;
- Pequ
- equivalent FRP-concrete permeation in the equivalent thickness model;
- PEW
- FRP-concrete field-condition permeation coefficient;
- PFRP
- FRP oxygen-permeation coefficient;
- PFRP-conc
- FRP-concrete oxygen permeation;
- pi
- oxygen partial pressure inside concrete;
- po
- oxygen partial pressure on the exposed FRP surface;
- p-value
- the minimum α needed to reject null hypothesis;
- R2
- coefficient of determination;
- rf
- final rebar radius;
- ro
- initial rebar radius;
- t
- diffusion duration;
- w/c
- water/cementitious ratio;
- x
- thickness;
- xconc
- correction factor for concrete presence in FRP-concrete;
- xFRP
- −1 for CFRP and 1 for GFRP;
- xN
- 2L – 3;
- α
- probability of rejecting a true null hypothesis;
- ΔXconcrete
- concrete cover thickness;
- ΔXequ
- equivalent thickness for FRP-concrete; and
- ΔXFRP
- FRP layer(s) thickness.
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Published In
Journal of Composites for Construction
Volume 24 • Issue 6 • December 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Mar 21, 2019
Accepted: Jul 14, 2020
Published online: Sep 8, 2020
Published in print: Dec 1, 2020
Discussion open until: Feb 8, 2021
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