Multi-Ion Erosion Experiment and Corrosion Mechanism Verification of Steel Fiber–Reinforced Concrete under Stray Current

Yu, Li; Xu, Wenqiang; Li, Hanzhang; Lai, Jiayu; Shen, Qiang; Luo, Tao

doi:10.1061/(asce)mt.1943-5533.0004499

Cited by 7 publications

(4 citation statements)

References 42 publications

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“…Figure 2 shows the comparison between experimental and simulated values of cathodic erosion depth. The experimental data is sourced from the [15]. As shown in the figure, the two-dimensional two-phase finite element model for Cl − transmission under stray currents simulates the depth of cathodic erosion, and the simulated values are very close to the experimental values.…”

Section: Parameter Validationmentioning

confidence: 71%

“…The characteristic of the decrease in electrical resistance and increase in electrical conductivity of concrete caused by steel fibers is considered to be an increase in the relative dielectric constant of mortar. The calculation parameters are the same as those used in literatures [8,15,27].…”

Section: Model and Calculation Parametersmentioning

confidence: 99%

“…However, when Cl − is introduced, the self-healing ability of the passivation film on the surface of steel fibers weakens or even disappears, accelerating the pitting process on the surface of steel fibers. The preliminary work [4,15] of this article delves into the effects of stray currents and saline alkali environments on steel fiber reinforced concrete. The experiment found that under the action of an electric field, the transfer speed of Cl − is significantly faster than that of SO 4 2− , accelerating the corrosion process of steel fiber reinforced concrete.…”

Section: Introductionmentioning

confidence: 99%

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Erosion depth prediction of chloride ions under stray current using FEM based CNNs

Li,

Zhang,

Liu

et al. 2024

Meas. Sci. Technol.

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Stray currents can accelerate the transport of corrosive ions, especially Cl-, in concrete materials, which is very detrimental to structural safety. Effectively predicting the erosion depth of Cl- is crucial for evaluating structural safety. This article is based on a finite element model and verifies the erosion depth of Cl- under different voltages, Cl- concentrations, and corrosion time through experimental data. A polynomial was used to fit the quantitative relationship between erosion depth, Cl- concentrations, and corrosion time under single voltage condition. However, this formula only applies to a single voltage and has too many parameters. Therefore, this article also established a CNNs regression model to predict the depth of Cl-, and the results showed the multiple regression ability of CNNs. It has been proven that CNNs can accurately predict the erosion depth, which helps to accurately evaluate structural safety. After comparing experimental values, CNNs, ResNet, and ResNet-Attention, it was found that residual networks and attention mechanisms did not significantly improve the prediction accuracy of deep networks, which may be related to insufficient data volume. After expanding the dataset, ResNet performed the best overall, and ResNet-Attention had better testing performance, which is related to the powerful feature extraction ability of the attention mechanism.

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Section: Parameter Validationmentioning

confidence: 71%

Section: Model and Calculation Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Erosion depth prediction of chloride ions under stray current using FEM based CNNs

Li,

Zhang,

Liu

et al. 2024

Meas. Sci. Technol.

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“…The spectacle plate and cutting ring are key components of the pumping system, with the spectacle plate mounted on the outlet of the concrete cylinder and the cutting ring mounted on the inlet of the distribution valve. When the distributor valve swings, the concrete fluid with high velocity and high pressure flows through the gap between the spectacle plate and cutting ring, causing erosion wear and reducing the life of these components [25][26][27].…”

Section: Commutation Timing Optimizationmentioning

confidence: 99%

Accurate Modeling, Operation Laws and Commutation Timing Matching for Concrete Pumping Systems

Ding,

Wang

2023

Applied Sciences

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The pump system is the heart of the concrete pump truck, and its main function is to deliver high-pressure concrete into the pipeline through the reciprocating motion and cooperation of the main cylinder and the distribution valve driven by the swing cylinder. However, there are currently problems, such as unclear pumping operation rules and mismatched commutation timing, that result in poor pumping efficiency and short life of wear parts such as spectacle plates and cutting rings. To address above problems, based on AMEsim software and system test data, this thesis establishes an accurate simulation model of the pump system with more than 90% precision. Based on this model, the simulation reveals the operating rules of the main cylinder and the swing cylinder during the pumping process; draws the commutation timing diagram of the pumping system; clarifies that the commutation timing has four characteristics: sequential, hysteresis, coupling and cyclic; and proposes an optimization scheme for the commutation timing, i.e., reducing the relief pressure of the main cylinder and shortening the swing time of the distribution valve. The proposed optimization has been proven in the market and significantly improved the life of wearing parts by more than 90%. This study provides technical reference for the structure and parameter optimization of concrete pumping systems.

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Research on Durability Evolution of Concrete in Sulfuric Acid Corrosion Environment

Yu,

Miao,

Lin

et al. 2024

J Fail. Anal. and Preven.

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Multi-Ion Erosion Experiment and Corrosion Mechanism Verification of Steel Fiber–Reinforced Concrete under Stray Current

Cited by 7 publications

References 42 publications

Erosion depth prediction of chloride ions under stray current using FEM based CNNs

Erosion depth prediction of chloride ions under stray current using FEM based CNNs

Accurate Modeling, Operation Laws and Commutation Timing Matching for Concrete Pumping Systems

Research on Durability Evolution of Concrete in Sulfuric Acid Corrosion Environment

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