Behavior and Modeling of Hybrid CFRP/Steel Reinforced Concrete Beams with Cathodic Protection in a Marine Environment
Publication: Journal of Composites for Construction
Volume 26, Issue 6
Abstract
Impressed current cathodic protection (ICCP) has been proven to be an effective technique to inhibit steel corrosion. Based on the principle of ICCP, a hybrid carbon fiber–reinforced polymer (CFRP)/steel reinforced concrete (RC) structural system with cathodic protection has been proposed considering the dual function of CFRP, namely, the anode material of ICCP and reinforcement of concrete structures at the same time. For this system, the larger structural deflection and brittle failure caused by the low elastic modulus and linear elastic behavior of the CFRP bar can be avoided, and ICCP is activated only when the steel bar is at risk for corrosion. In this paper, the flexural performance of the proposed structural system with different reinforcement configurations was investigated. First, an accelerated precorrosion test was conducted for the steel bar with a theoretical corrosion ratio of 8%. Then, wet–dry cycle corrosion was performed by companies with ICCP treatment for 150 and 180 days. Finally, four-point bending tests were carried out, followed by a comparison of the experimental bending capacities and predicted values. The results showed that for the proposed structural system, the further corrosion of steel bars was inhibited significantly with a protection current density of 10 mA/m2, leading to the maintenance of satisfactory structural performance without a marked deterioration of the CFRP anode performance or the CFRP-concrete bond behavior. The reinforcement configuration with CFRP bars in the lower row and steel bars in the upper row was the most effective to maintain a satisfying bending capacity and inhibit steel corrosion for the proposed structural system in a corrosive environment.
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Acknowledgments
This research was funded by the National Natural Science Foundation of China (Grant Nos. 51978412, 51908372, U2001226, and 52008255), the Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering (SZU) (Grant No. 2020B1212060074), the Natural Science Foundation of Guangdong Province (Grant No. 2021A1515010495), and the Shenzhen Basic Research Project (Grant No. JCYJ20190808154805456).
Notation
The following symbols are used in this paper:
- Af
- area of FRP bar;
- As
- area of steel bar;
- b
- width of the cross section;
- d
- distance from the surface of compression concrete to the centroid of tension reinforcements;
- ds
- diameter of the steel bar;
- Ef
- elastic modulus of the FRP bar;
- Es
- elastic modulus of the steel bar;
- F
- Faraday’s constant (96,487 c · mol−1);
- compressive strength of concrete;
- fy
- yield strength of the steel bar;
- fyt
- yield strength of a corroded steel bar;
- i
- current density;
- ls
- length of the steel bar;
- M
- molar mass (56 g/mol);
- m
- mass of the steel bar before corrosion;
- Mu
- ultimate flexural bending capacity;
- t
- accelerated corrosion duration;
- Z
- number of lost electrons;
- αy
- an empirical coefficient;
- β1
- ratio between the depth of the equivalent rectangular concrete stress block and the neutral axis depth;
- ΔAst
- section area loss of the steel bar;
- Δm
- mass loss for the steel bar;
- ɛcu
- ultimate compressive strain of concrete;
- ɛsf
- strain of the equivalent material reinforcement;
- ɛy
- yield strain of the steel bar;
- η
- steel corrosion ratio;
- ρeff
- effective reinforcement ratio;
- ρeff,b
- balanced reinforcement ratio;
- ρf
- FRP reinforcement ratio; and
- ρs
- steel reinforcement ratio.
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Published In
Journal of Composites for Construction
Volume 26 • Issue 6 • December 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Nov 2, 2021
Accepted: Jul 18, 2022
Published online: Oct 11, 2022
Published in print: Dec 1, 2022
Discussion open until: Mar 11, 2023
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