Numerical modelling of electrochemical deposition techniques for healing concrete damaged by alkali silica reaction

Li, Qingfeng; Meng, Zhaozheng; Hou, Dongshuai; Zhou, Yu; Cai, Yuxin; Zhang, Mingzhong; Tam, Vivian W.Y.

doi:10.1016/j.engfracmech.2022.108765

Cited by 16 publications

(3 citation statements)

References 92 publications

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“…Besides, considering that the ASR-induced crack distribution pattern is more discrete, the repair arrangement should be different from that applied for the aforementioned two cracking reasons. Numerical modelling results also confirmed that for ASR-damaged concrete, making all exposed surfaces as working anodes can ensure the optimal repair effect [103]. Through the above research, it can be seen that the electrochemical deposition method is also a powerful rehabilitation technique that can repair damage caused by a variety of concrete durability problems at the same time, but the detailed arrangement of the repair device and settings of electrochemical parameters during the treatment would still depend on the specific durability problem.…”

Section: Electrochemical Deposition Methods For Crack Healingmentioning

confidence: 60%

Progress and research challenges in concrete durability: ionic transport, electrochemical rehabilitation and service life prediction

2022

RILEM Tech Lett

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Concrete durability degradation problems have received considerable attention in both research field and concrete industry during recent decades. To better understand the underlying mechanisms, various numerical models have been put forward aiming at widely concerned scientific issues involved in the entire life cycle of concrete structures: ionic transport in porous medium, degradations induced by multiple factors, as well as the prediction and rehabilitation method to prolong the service life. This letter aims to summarise the major contributions to these interrelated scientific issues particularly from the modelling perspective. The digital characterization of concrete heterogeneity and its influence on ionic transport behaviour will be firstly reviewed. Subsequently, concrete deterioration mechanisms induced by various factors and their internal coupling relationships are discussed in details. Meanwhile, promising electrochemical repair techniques with multi-fold advantages including chloride removal, corrosion inhibition, ASR mitigation and crack repair are systematically summarized. Finally, existing research gaps and future opportunities in these areas have also been visited, which is hoped to break the ice in this challenging field and promote the sustainable development of the concrete industry.

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Section: Electrochemical Deposition Methods For Crack Healingmentioning

confidence: 60%

Progress and research challenges in concrete durability: ionic transport, electrochemical rehabilitation and service life prediction

2022

RILEM Tech Lett

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“…Apart from chloride ions, the pore solution in concrete also involves other ionic species, such as calcium [48], sodium, potassium, hydroxide, sulphate, etc. [46,47,49]. While ionic transport is commonly determined by Fick's law, it only considers the diffusion of a single ion at the macro scale, and it is difficult to accurately reflect the activity process of multiple species in concrete at the meso/micro scale [50].…”

Section: Electrochemical Coupling Between Multispeciesmentioning

confidence: 99%

Influence of coarse aggregate settlement induced by vibration on long-term chloride transport in concrete: a numerical study

et al. 2022

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High-frequency vibration helps to improve the compactness of concrete, but also causes the settlement of coarse aggregates (CAs) and then affects the durability of hardened concrete. In this paper, a numerical study combining multi-phase CA settlement model and multi-component ionic transport model is performed to understand the influence of vibration-induced settlement on long-term chloride transport in concrete. Through parametric analysis, the influence mechanism of relevant factors on both chloride profile distribution and reinforcement corrosion initiation is discussed in detail. The results indicate that with the increase of vibration time, a decrease of chloride concentration appears in the bottom part of concrete specimen and a significant increase in the top part, because more CAs deposit in the bottom layer. Due to sedimentation, a more obvious fluctuation of chloride concentration along the height direction can be observed in the concrete mixed with a larger density and particle size of CAs. According to the model prediction, the corrosion of the top steel bar initiates 1.03-1.80 years earlier than that of the bottom steel bar under the same parameters. In practical engineering, special attention should be paid on the stability of fresh concrete and vibrating procedures to avoid obvious CA settlement.

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“…Then, a global picture of the whole macro-cell circuit including both anodic and cathodic reactions is being aimed for structural concrete (Maekawa et al 2019;Wang et al 2021). A number of theoretical (Bažant 1979a(Bažant , 1979b and numerical (Hsu et al 2000;Maruya et al 2007;Liu et al 2012;Hong et al 2017;Xia et al 2019) studies have analyzed macro-cell corrosion, anti-corrosion and electrochemical reparation (Liu et al 2022;Meng et al 2022) by considering the chemical components (alkalinity, O2, CO 2 , ions equilibrated with solid minerals) of the electrolytes of concrete matrix. Here, the following points are focused for further enhancement.…”

Section: Introductionmentioning

confidence: 99%

Space Averaging of Electric Field accompanying Corrosion of Reinforcement and its Verification by Pseudo-Concrete

Wang

Maekawa

Gong

2023

ACT

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This paper aims to verify a space-averaged electric filed simulation, where the whole surfaces of reinforcing bars are blended into the 3D finite volume for identifying the electric potential to drive the macro-cell corrosion of structural concrete. Experimental verification is conducted with transparent pseudo-concrete, which has chemical pore-solutions similar to those of concrete, and with which the location of anodic poles accompanying brownish rusts and the cathodic ones surrounded by hydrogen bubbles may be visually identified. The proposed electro-chemical analysis platform to be integrated with ion transport and equilibrium is adopted for full consistency with dispersed reinforcing bars. Global macro-cell corrosions of tunnel mockup and reinforcement layers induced by electric current leakage are verified quantitatively with dispersed multi-ion concentration as well as corrosion profile.

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Numerical modelling of electrochemical deposition techniques for healing concrete damaged by alkali silica reaction

Cited by 16 publications

References 92 publications

Progress and research challenges in concrete durability: ionic transport, electrochemical rehabilitation and service life prediction

Progress and research challenges in concrete durability: ionic transport, electrochemical rehabilitation and service life prediction

Influence of coarse aggregate settlement induced by vibration on long-term chloride transport in concrete: a numerical study

Space Averaging of Electric Field accompanying Corrosion of Reinforcement and its Verification by Pseudo-Concrete

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