Effectiveness of a dual-functional intervention method on the durability of reinforced concrete beams in marine environment

Zhu, Ji-Hua; Zeng, Chaoqun; Su, Meini; Zeng, Zhongda; Zhu, Aizhu

doi:10.1016/j.conbuildmat.2019.06.102

Cited by 16 publications

(9 citation statements)

References 22 publications

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“…Therefore, the pre-stress levels of the high-strength steel wires were set to 0, 350, and 700 MPa. In accordance with Zhu's research 37 on the ICCP method for concrete steel bars, the protection current densities selected in this experiment were 0, 20, and 60 mA/m 2 . To obtain a high corrosion level within a short period, an accelerated corrosion test was conducted in the laboratory by using a 3% NaCl solution to simulate rainwater containing a large number of chloride ions in marine atmosphere.…”

Section: Experimental Conditionsmentioning

confidence: 93%

Corrosion evaluation of prestressed high‐strength steel wires with impressed current cathodic protection based on acoustic emission technique

Liang

Zhang

2022

Structural Contr & Hlth

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Summary The acoustic emission (AE) technique is a non‐destructive testing method widely used in various structural health monitoring fields, and it is highly sensitive to the emergence and development of material corrosion. This study developed a method of employing the AE technique to evaluate the corrosion degree of stay cable high‐strength steel wires under pre‐stress and impressed current cathodic protection (ICCP) in a simulated marine atmospheric rainwater environment. The variation characteristics of AE parameters under various pre‐stress levels and protection current densities were investigated. Results showed that the more negative the open circuit potentials (OCPs) and the greater the average corrosion rates, the higher the cumulative AE parameters. In the AE intensity analysis of corrosion damage for stay cable high‐strength steel wires, the constants J and the K were taken as 40 and 25 hits, respectively. The corrosion of steel wires was divided into no corrosion, slight corrosion, medium corrosion, and severe corrosion. The corrosion degree of specimens with ICCP was classified as no corrosion and slight corrosion, whereas that of unprotected specimens was classified as medium corrosion and severe corrosion.

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Section: Experimental Conditionsmentioning

confidence: 93%

Corrosion evaluation of prestressed high‐strength steel wires with impressed current cathodic protection based on acoustic emission technique

Liang

Zhang

2022

Structural Contr & Hlth

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“…In this intervention method, the carbon-fibre meshes embedded in FRCM functions as an anode material for ICCP and as an external strengthening material for SS [ 14 ]. A number of experimental programmes have been carried out to demonstrate the effectiveness of the ICCP-SS dual-intervention system on corroded structural members, including short columns under static loads [ 15 ] and under cyclic loads [ 16 ], simply supported beams [ 17 , 18 ] and continuous beams [ 19 , 20 ] under static loads, as well as simply supported beams [ 21 ] and continuous beams [ 22 , 23 ] under cyclic loads. Specifically, results from research [ 15 ] reveal that the ultimate compressive loads of columns intervened upon by the ICCP-SS technique could be improved by up to 50.4% compared to control columns.…”

Section: Introductionmentioning

confidence: 99%

“…In terms of ICCP-SS application on flexural members, Su et al [ 17 ] bonded a carbon FRCM (C-FRCM) plate to the soffit of simple support beams for both ICCP applying and external strengthening, and results indicated a 19.2% to 41.8% increase in flexural bearing capacity. A long-term experimental program was later conducted by Zhu et al [ 18 ] to investigate the optimal range of charge density and protection duration for mechanical-behaviour enhancement. A similar improvement in the flexural performance of RC continuous beams with ICCP-SS was also reported by Su et al [ 19 ] and Feng et al [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of FRCM-Strengthened Corroded RC Beams under Cathodic Protection

Abdulla

Zhang

2022

Materials

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Fibric reinforced cementitious matrix (FRCM) composites have been used to improve the mechanical performance of reinforced concrete beams subjected to degradation in the past decades. Recently, dual-functional carbon fibres have been explored to provide both structural strengthening to RC beams and cathodic protection to reinforcement bars. This paper investigates the loading responses and structural behaviour of RC beams subjected to different levels of corrosion, protected by impressed current cathodic protection and structurally strengthened by external bonded FRCM. A numerical model is developed for the corroded RC beams under impressed current cathodic protection and structural strengthening by the FRCM composite. Upon validation against experimental results collected from the literature, the finite element model is then used for parametric study. A number of numerical results are generated to analyse the effects of key parameters, including the corrosion rate, degradation level of interfacial bonding properties due to anode acidification, and end anchorage, followed by detailed discussions. It is found that the significance of the corrosion of steel reinforcement bars significantly affects the load-carrying capacity of the beams. Increasing the corrosion rate from 0 to 40% reduces the load-carrying capacity of un-strengthened beams to 45% of the original capacity. Therefore, the cathodic protection provided by the C-FRCM plate is important to the reinforcement bars as it can avoid the cross-section area reduction of reinforcement bars and, thus, the main loading capacities of the beams. In this study, the degradation of the bonding properties at the interface of carbon fibre and the cementitious matrix due to anode acidification during impressed current cathodic protection is also considered. It is found that the bond strength of the C-FRCM plate has a slight effect on the load-carrying capacity of the beam. In addition, the application of end anchorage can significantly enhance both the load-carrying capacity and ductility of the beams. The rates of enhancement, if compared to the beams with no end anchorage, can reach up to 60%.

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“…In the study of Sun et al in 2016 [26], the corrosion behavior of CFRP laminate as the anodic material was focused with 3% NaCl solution, and the electrochemical performance as well as mechanical properties were identified. Recently, a dual function of CFRP in the ICCP system was demonstrated, i.e., externally bonded CFRP functioned as both the anode material for ICCP and strengthening material for structural strengthening system simultaneously [27][28][29][30][31]. However, to ensure the bonding reliability between the externally bonded CFRP and the concrete, as well as to improve the reinforcing effectiveness of the CFRP, developing an efficient conductive inorganic binder is urgent, which restricts the application of this system.…”

Section: Introductionmentioning

confidence: 99%

“…Compared with the SFCB anode, the ICCP system with the CFRP bar as the anode was more effective for the hybrid-reinforced concrete beam to prevent the steel corrosion. In general, the key issue of this paper was to investigate the flexural performance of hybrid RC beams with CFRP bar or SFCB as the anode material in the ICCP system subjected to corrosion, leading to the differences in CFRP type and test contents compared with other references [26,28]. Furthermore, considering the sea sand and seawater utilized and dry-wet cycle corrosion performed in this experiment, it can be inferred that the new ICCP system is a promising method to protect the steel bar subjected to the marine environment, and can further promote the utilization of sea sand and seawater in civil engineering.…”

Section: Introductionmentioning

confidence: 99%

Study on the Flexural Performance of Hybrid-Reinforced Concrete Beams with a New Cathodic Protection System Subjected to Corrosion

et al. 2020

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Steel corrosion is considered as the main factor for the insufficient durability of concrete structures, especially in the marine environment. In this paper, to further inhibit steel corrosion in a high chloride environment and take advantage of the dual-functional carbon fiber reinforced polymer (CFRP), the impressed current cathodic protection (ICCP) technique was applied to the hybrid-reinforced concrete beam with internally embedded CFRP bars and steel fiber reinforced polymer composite bar (SFCB) as the anode material while the steel bar was compelled to the cathode. The effect of the new ICCP system on the flexural performance of the hybrid-reinforced concrete beam subjected to corrosion was verified experimentally. First, the electricity-accelerated precorrosion test was performed for the steel bar in the hybrid-reinforced beams with a target corrosion ratio of 5%. Then, the dry–wet cycles corrosion was conducted and the ICCP system was activated simultaneously for the hybrid-reinforced concrete beam for 180 days. Finally, the three-point bending experiment was carried out for the hybrid-reinforced concrete beams. The steel bars were taken out from the concrete to quantitatively measure the corrosion ratio after flexural tests. Results showed that the further corrosion of steel bars could be inhibited effectively by the ICCP treatment with the CFRP bar and the SFCB as the anode. Additionally, the ICCP system showed an obvious effect on the flexural behavior of the hybrid-reinforced concrete beams: The crack load and ultimate load, as well as the stiffness, were enhanced notably compared with the beam without ICCP treatment. Compared with the SFCB anode, the ICCP system with the CFRP bar as the anode material was more effective for the hybrid-reinforced concrete beam to prevent the steel corrosion.

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Effectiveness of a dual-functional intervention method on the durability of reinforced concrete beams in marine environment

Cited by 16 publications

References 22 publications

Corrosion evaluation of prestressed high‐strength steel wires with impressed current cathodic protection based on acoustic emission technique

Corrosion evaluation of prestressed high‐strength steel wires with impressed current cathodic protection based on acoustic emission technique

Numerical Investigation of FRCM-Strengthened Corroded RC Beams under Cathodic Protection

Study on the Flexural Performance of Hybrid-Reinforced Concrete Beams with a New Cathodic Protection System Subjected to Corrosion

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