Corrosion behavior of carbon fiber reinforced polymer anode in simulated impressed current cathodic protection system with 3% NaCl solution

Sun, Hongfang; Wei, Liangliang; Zhu, Miaochang; Han, Ningxu; Zhu, Ji-Hua; Xing, Feng

doi:10.1016/j.conbuildmat.2016.02.141

Cited by 51 publications

(27 citation statements)

References 19 publications

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“…Considering the influence of the high current density on the concrete and The current density in the ICCP system is a critical factor. A higher current density, which was greater than 2000 mA/m 2 , could be used to perform accelerated EC tests in an aqueous solution over a short test period [7,8]. Although the maximum applied current density in concrete was normally limited to 20 mA/m 2 , the current density may be increased to 50 mA/m 2 in extreme environments, such as high chloride contamination, moist, wetting and drying, and severe corrosion of steel with a thin concrete cover [17].…”

Section: Ec Tests Proceduresmentioning

confidence: 99%

“…A large amount of H + could be produced at the anode interface, leading to acidification. Moreover, in the presence of chloride in the concrete, the reactions shown in Equations (7) and (8) could also occur, thereby accelerating the acidification at the anode interface.…”

Section: Degradation Of Anode Interfacementioning

confidence: 99%

“…Some researchers [7,8] have conducted electrochemical (EC) tests of CFRP in aqueous solutions using a current density greater than 2 A/m 2 for a few months. The EC test is carried out in the laboratory conditions that are intended to simulate the conditions present when cathodic protection current discharges from the anode in a working ICCP system.…”

Section: Introductionmentioning

confidence: 99%

“…The EC test is carried out in the laboratory conditions that are intended to simulate the conditions present when cathodic protection current discharges from the anode in a working ICCP system. Sun et al [7] evaluated the tensile strength of CFRP after being subjected to polarization in 3% NaCl electrolyte solutions. The results showed that the tensile strength of CFRP decreased with increasing charge density.…”

Section: Introductionmentioning

confidence: 99%

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Anodic and Mechanical Behavior of Carbon Fiber Reinforced Polymer as a Dual-Functional Material in Chloride-Contaminated Concrete

et al. 2020

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Carbon fiber reinforced polymer (CFRP) has been used as a dual-functional material in a hybrid intervention system (ICCP-SS) which integrates the impressed current cathodic protection (ICCP) and structural strengthening (SS). The mechanical behavior of CFRP as an anode has been investigated in some solution environments. However, the anodic and mechanical behavior of CFRP bonded to concrete is unclear. This paper focuses on the anodic and mechanical performance of CFRP bonded to the chloride-contaminated concrete by conducting an electrochemical (EC) test. The method of bonding the CFRP to the concrete and the shape of the steel embedded in the concrete were considered. The current densities of 20 mA/m2 and 100 mA/m2 were applied during 120-day and 310-day EC tests. The electrode potentials and driving voltages were recorded, and the bond interfaces of the CFRP were inspected after EC test. The residual tensile strength and failure modes of the CFRP were analyzed after tensile tests. Finally, the long-term performance of CFRP as a dual-functional material in ICCP-SS system was discussed. Results show that the externally bonding CFRP in ICCP-SS system can not only protect the steel in chloride-contaminated concrete effectively but also maintain 70% of the original tensile strength of CFRP at a charge density of 744 A·h/m2. The expected service period of CFRP as a dual-functional material bonded to the chloride-contaminated concrete was determined to be more than 42.5 years.

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Section: Ec Tests Proceduresmentioning

confidence: 99%

Section: Degradation Of Anode Interfacementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Anodic and Mechanical Behavior of Carbon Fiber Reinforced Polymer as a Dual-Functional Material in Chloride-Contaminated Concrete

et al. 2020

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“…The CFRP anode can operate at 128 mA/m 2 with a relatively low consumption rate, and the ultimate strength of concrete increases approximately 13.5% using surface‐mounted CFRP fabric . The degradation mechanism of a CFRP anode has been investigated in simulated solutions and a concrete environment …”

Section: Introductionmentioning

confidence: 99%

Effect of the paste–anode interface under impressed current cathodic protection in concrete structures

Zhang

Tang

Bernin³

et al. 2018

Materials & Corrosion

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Impressed current cathodic protection (ICCP) is a powerful method to prevent and stop corrosion of steel in concrete structures. To evaluate the long‐term effect of ICCP, accelerated tests have been adopted using high current densities. A carbon fiber reinforced polymer mesh was introduced as anode. The presented research focused on the changes at the paste–anode interface as a consequence of applying current. The treated samples were characterized by various techniques. Calcium dissolution was found with an average thickness of 0.34 mm around the anode after charges of 6 × 106 C/m2 were applied, equivalent to applying 4 mA/m2 of anode surface for 30 years. Calcium dissolution resulted in a white zone around the anode, where the calcium silica ratio was lowered and almost no crystal phase was observed. NMR results show clear Q3 and Q4 peaks in the white zone, which contained extended branched and networked structures of hardened cement paste. An increased resistance caused by the formation of the white zone may eventually make the system fail because of insufficient current densities. CFRP has been proven suitable for ICCP application even at a current density of 4 A/m2 of anode surface.

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Eco‐efficient recycling of carbon fibers from CFRP waste: A two‐step strategy by nanosecond pulsed laser

Li,

Yang,

Teng

et al. 2024

Polymer Composites

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The accumulation of CFRP waste poses significant environmental challenges, necessitating the development of green and efficient recycling technologies. This study employs a nanosecond pulse laser (λ = 1064 nm) to develop a two‐step laser recycling method (LRM) for CFRP. By setting stepped process parameters, the method sequentially completes the separation and cleaning of the CFRP layers, recovering carbon fibers that retain their original weave structure in just 147 s. The study delves into the characteristics of the products from the rapid laser pyrolysis of the epoxy resin matrix and unveils the interaction mechanisms between the pyrolysis products and recycled carbon fiber (rCF). The study utilized MATLAB to simulate the effects of defocusing on the distribution of laser energy and proposed an optimization strategy that balances product quality with efficiency. The results indicate that laser‐induced thermal decomposition leads to unique microscopic damage patterns in rCF, including microcracks, etching, and delamination. Cleanliness and resin removal rate serve as crucial indicators for quantitatively optimizing the process. The optimized LRM increased efficiency by 110.20% and achieved a resin removal rate of 97.92%, while maintaining rCF tensile strength and modulus retention rates at 93.38% and 105.77%, respectively. The energy consumption was only 13.77% of that required to produce virgin carbon fibers. The LRM operates under mild conditions without the need for harsh reaction conditions, enabling ultra‐fast on‐site recycling and offering a promising solution to the challenges of CFRP waste recycling.Highlights Using lasers for rapid delamination and cleaning of CFRP carbon fiber layers. The type and quantity of pyrolysis products significantly affect recovery quality. Laser‐induced resin pyrolysis oxidation damages carbon fibers. Laser energy compensation and defocusing strategies balance efficiency and quality.

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Corrosion behavior of carbon fiber reinforced polymer anode in simulated impressed current cathodic protection system with 3% NaCl solution

Cited by 51 publications

References 19 publications

Anodic and Mechanical Behavior of Carbon Fiber Reinforced Polymer as a Dual-Functional Material in Chloride-Contaminated Concrete

Anodic and Mechanical Behavior of Carbon Fiber Reinforced Polymer as a Dual-Functional Material in Chloride-Contaminated Concrete

Effect of the paste–anode interface under impressed current cathodic protection in concrete structures

Eco‐efficient recycling of carbon fibers from CFRP waste: A two‐step strategy by nanosecond pulsed laser

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