Numerical study on cracking and its effect on chloride transport in concrete subjected to external load

Liu, Qingfeng; Hu, Zhe; Wang, Xing-er; Zhao, Haitao; Qian, Kai; Li, Linjie; Meng, Zhaozheng

doi:10.1016/j.conbuildmat.2022.126797

Cited by 73 publications

(20 citation statements)

References 63 publications

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“…This is because to actually couple the cracking with chloride ingress, the crack propagation process should be reflected on the geometric level which indicates a time-dependent model geometry, while the continuously changed geometry certainly will have a series of effects on the meshing quality and numerical convergency [74]. As a result, Liu et al tried to divide this coupled process into several stages over time, and each stage is linked through a statistical learning method to achieve their internal coupling [75]. However, it has to be admitted that the coupling between crack propagation and chloride transport by statistical learning is still a compromise, and the prediction accuracy is highly dependent on the number of divided stages.…”

Section: Coupled Deterioration Of External Load and Chloride Ingressmentioning

confidence: 99%

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: Coupled Deterioration Of External Load and Chloride Ingressmentioning

confidence: 99%

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

2022

RILEM Tech Lett

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“…Compared to tortuous cracks (Q.F. Liu et al, 2022) in real cases, artificially assumed rectangular cracks with constant width and same development direction will shorten the ionic transport path and lead to an overestimated ionic transport speed (Q. F. Liu, Easterbrook, et al., 2015). As for ionic transport and crack repairing, interactions and reactions between various ionic species under electrochemical repair conditions are rarely studied.…”

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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“…With the recent and rapid development of the Chinese national economy, cross-sea bridges in China have also ushered in a new era. For bridges in long-term marine environments, not only the upper structures are located in the salt spray zone, and Cl − in the salt spray will signi cantly in uence the service life of a sea-crossing bridge, [1][2][3] but also subject to long-term bending load. Over time, the coupling e ect of bending load and salt spray erosion corrodes the steel reinforcement in the bridge structure, which results in a durability loss and has become an important problem a ecting the service life of marine concrete structures.…”

Section: Introductionmentioning

confidence: 99%

Durability of Marine Concretes with Nanoparticles under Combined Action of Bending Load and Salt Spray Erosion

Cui

Tian

et al. 2022

Advances in Materials Science and Engineering

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The coupling effect of bending load and salt spray erosion during the service of a sea-crossing bridge accelerates the deterioration and durability of concrete and dramatically reduces the load-carrying capacity of the bridge. The effects of nanoparticles on the durability of marine concrete exposed to bending loads and salt spray erosion were studied. In this paper, nano-SiO2 and nano-Fe2O3 were mixed into plain concrete. Free chloride ions (Cl−) were titrated at different concrete depths using a four-point loading device and a self-developed salt spray erosion test chamber. Test results showed that chloride ion levels in the tensile and compressive zones for both nanoconcretes were lower than plain concrete at the same timepoint. The optimal mixtures of the two nanoparticles were 2% and 1%, and the improvement of nano-SiO2 was more significant than nano-Fe2O3. Due to the special properties of nanomaterials, they effectively improved the microstructure of concrete and the composition of cement hydration products. This allowed concrete to become more compact, reduced crack generation, increased the difficulty of Cl− migration inside the concrete, and improved the overall durability of marine concrete upon exposure to bending loads and salt spray erosion.

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Numerical study on cracking and its effect on chloride transport in concrete subjected to external load

Cited by 73 publications

References 63 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

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

Durability of Marine Concretes with Nanoparticles under Combined Action of Bending Load and Salt Spray Erosion

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