Multiphysics coupling model for the crack repairing process using electrochemical deposition

“…Chen et al (2018) proposed micromechanical models for both saturated and unsaturated concrete after electrochemical repair. Recently, Zhou et al (2020) proposed a numerical model studying electrochemical repair for both cracked concrete and metal surface based on multi-physical fields coupling. However, the concrete cracking process was not included, and the crack width was assumed as constant.…”

Section: Introductionmentioning

confidence: 99%

Mechanical–transport–chemical modeling of electrochemical repair methods for corrosion‐induced cracking in marine concrete

Meng

Xia

et al. 2022

Computer aided Civil Eng

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Reinforced concrete structures exposed to marine environments often experience chloride ingress, reinforcement corrosion, and corrosion‐induced cracking. The electrochemical repair method is a promising concrete rehabilitation technique with advantages of non‐destructive and economic performance in crack repair, chloride removal, and corrosion protection, which is particularly suitable for structures exposed to marine environments. This work presents an innovative methodology for modeling the mechanical, transport, and chemical process during electrochemical treatment for marine concrete structures. The entire process from concrete cracking up to repairing can be successfully reproduced and digitally visualized. The first sub‐model calculates the corrosion‐induced cracking process at the mesoscopic level with the consideration of local mechanical variances of concrete composites. Then, a reactive transport sub‐model is established to reveal the interactions and electrochemical reactions among various species of ions. A crack repair sub‐model is built to visualize the moving interface between chemical deposition and crack surface. Through combining the three sub‐models, the interconnected influencing factors in practical engineering can be quantitively investigated. The calculation results show that, compared with electrolyte concentration, the influence of current density on crack closure rates are more obvious. Other factors such as steel reinforcement diameter and crack distribution pattern, which have not been previously reported are highlighted. These findings can guide the application of electrochemical repair in practical engineering.

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“…EDT improves mechanical properties of corroded reinforced concrete: bonding-strength steel and concrete, flexural capacity of reinforced concrete beams. In addition, there are various theoretical and analytical models that explain crack repairing process using EDT [ 27 , 28 , 29 , 30 ]. Therefore, EDT is a high-potential rehabilitation method that is applicable to deteriorated concrete with a wide range of severity levels.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Deposition Treatment (EDT) as a Comprehensive Rehabilitation Method for Corrosion-Induced Deterioration in Concrete with Various Severity Levels

Kim

Yee

Kee

2021

Sensors

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The primary purposes of this study are to investigate the feasibility of electrochemical deposition treatment (EDT) as a comprehensive rehabilitation method for corrosion-induced deterioration in reinforced concrete with various severity levels, and to propose a guideline for the determination of critical factors to advance EDT. This study includes three experimental phases, each of which simulates the initiation (de-passivation), propagation (high corrosion activity), and acceleration (formation of a surface-breaking crack) periods of corrosion-induced deterioration. After completion of a series of accelerated corrosion tests, damaged concrete samples with different severity levels are rehabilitated by a series of EDT processes using a MgCl2 solution in an electrolyte. The main variables for this experiment are the concentration levels (0, 0.3, 1.0 and 3.0 M) of a MgCl2 solution for test phase 1, charging time (0, 2, and 7 days) in EDT for test phase 2, and configuration of pre- and post-treatment processes in EDT for test phase 3. The rehabilitation performance of EDT is evaluated by analyzing the AC impedance properties of the steel-and-concrete interface using electrochemical impedance spectroscopy (EIS) for the test phases 1 and 2, and microscopic alternation in concrete cracks using optical microscopic image and SEM/EDX. It is demonstrated that EDT is an effective method for preventing and mitigating corrosion-induced deterioration in the initiation and rust propagation periods of corrosion and for repairing (closing and filling) a corrosion-induced surface-breaking crack in the acceleration phase of corrosion. Corrosion-resistant performance of concrete increases as the concentration levels of a MgCl2 solution in an electrolyte increases and as the charging time in EDT increases. In addition, a post-treatment process (applying a NaOH solution) after the electrochemical deposition process significantly improves crack-repairing performance of EDT.

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Multiphysics coupling model for the crack repairing process using electrochemical deposition

Cited by 16 publications

References 20 publications

Debye layer effect of ion migration in repairing cracks byelectrodeposition

Debye layer effect of ion migration in repairing cracks byelectrodeposition

Mechanical–transport–chemical modeling of electrochemical repair methods for corrosion‐induced cracking in marine concrete

Electrochemical Deposition Treatment (EDT) as a Comprehensive Rehabilitation Method for Corrosion-Induced Deterioration in Concrete with Various Severity Levels

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