3D meso-scale simulation of chloride ion transportation in cracked concrete considering aggregate morphology

Zheng, Bin; Li, Tongchun; Qi, Huijun; Gao, Lingang; Liu, Xiaoqing; Yuan, Li

doi:10.1016/j.conbuildmat.2022.126632

Cited by 16 publications

(3 citation statements)

References 48 publications

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“…For the mesoscopic model of recycled concrete [8], the initial chloride ion diffusion coefficients of different parts are shown in Table 1.…”

Section: Theory Of Chloride Ion Transportationmentioning

confidence: 99%

Three-Dimensional Multi-Phase Microscopic Simulation of Service Life of Recycled Large Aggregate Self-Compacting Concrete

Li,

Gao,

Liu

et al. 2024

MSCE

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Recycled large aggregate self-compacting concrete (RLA-SCC) within multiple weak areas. These weak areas have poor resistance to chloride ion erosion, which affects the service life of RLA-SCC in the marine environment. A three-dimensional multi-phase mesoscopic numerical model of RLA-SCC was established to simulate the chloride ions transportation in concrete. Experiments of RLA-SCC immersing in chloride solution were carried out to verify the simulation results. The effects of recycled large aggregate (RLA) content and RLA particle size on the service life of concrete were explored. The results indicate that the mesoscopic numerical simulation results are in good agreement with the experimental results. At the same depth, the closer to the surface of the RLA, the greater the chloride ion concentration. The service life of RLA-SCC in marine environment decreases with the increase of RLA content. Compared with the service life of 20% content, the service life of 25% and 30% content decreased by 20% and 42% respectively. Increasing the particle size of RLA can effectively improve the service life of RLA-SCC in chloride environment. Compared with the service life of 50 mm particle size, the service life of 70 mm and 90 mm increased by 61% and 163%, respectively.

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“…For the mesoscopic model of recycled concrete [8], the initial chloride ion diffusion coefficients of different parts are shown in Table 1.…”

Section: Theory Of Chloride Ion Transportationmentioning

confidence: 99%

Three-Dimensional Multi-Phase Microscopic Simulation of Service Life of Recycled Large Aggregate Self-Compacting Concrete

Li,

Gao,

Liu

et al. 2024

MSCE

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“…In this paper, it is assumed that the thickness of the ITZ obeys a normal distribution (X ∼ N µ, σ 2 ), and based on the existing random aggregate model [27][28][29][30], a new concrete random aggregate algorithm model is established to consider the randomness of the ITZ thickness. The following steps describe the formation process of mesoscopic model in detail.…”

Section: Concrete Mesostructurementioning

confidence: 99%

Effect of Interface Transition Zone and Coarse Aggregate on Microscopic Diffusion Behavior of Chloride Ion

et al. 2022

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Concrete is a multiphase composite material composed of coarse aggregate, cement mortar, and interface transition zone (ITZ). It is of great significance to study the effect of ITZ and coarse aggregate on chloride microscopic diffusion behavior for predicting the service life of reinforced concrete (RC) structures. By introducing the random distribution function, a random coarse aggregate model considering the randomness of the thickness of the ITZ was established. Furthermore, a two-dimensional (2D) chloride ion diffusion mesoscopic model was developed by specifying different diffusion properties for different phase materials of concrete. Moreover, the effects of coarse aggregate rate, ITZ thickness, and ITZ diffusion property on chloride ion diffusion behavior were investigated in this paper. The research showed that the aggregate has hindrance and agglomeration action on chloride ion diffusion. Although the volume content of the ITZ was very small, less than 0.2% of the total volume of concrete, the effect of the ITZ on the chloride diffusion in concrete cannot be ignored. More importantly, the mechanism of promoting chloride diffusion in the ITZ was revealed through the chloride diffusion trajectory. The research revealed the transmission mechanism of chloride ions in the meso-structure of concrete and provides theoretical support for the design of RC structures in coastal areas.

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“…Under the action of alternating loads, these concrete structures are subjected to specific fatigue damage. The internal structure of the concrete subjected to fatigue loading undergo cracks and microstructural changes, which can increase the rate of chloride ion penetration and accelerate the corrosion of reinforcement in concrete [ 2 ]. Therefore, it is economically and practically essential to study the improvement of durability of fatigue-damaged concrete and to reduce the diffusion of external chloride ions into fatigue-damaged concrete [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

Fractional-order numerical modeling to study chloride ion transport in concrete with fly ash or slag additions

Zhou,

Huang,

Chen

2023

PLoS ONE

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To better study the chloride ion migration in concrete with fly ash or ground granulated blast furnace slag under low fatigue load, a Caputo time fractional-order chloride diffusion model is developed in this paper. The model, grounded in Fick’s second law with a fractional-order derivative, employs an implicit numerical method for discretization, resulting in a fractional-order numerical scheme. The stability and convergence of the scheme are rigorously proven within the paper. The model’s unknown parameters are estimated using genetic algorithm with a grid method. To validate the model’s effectiveness, its numerical solution is juxtaposed with experimental results from chloride erosion studies. Furthermore, the fitting efficacy of the Caputo time fractional-order numerical scheme is compared with that of the classical Fick’s second law numerical scheme and analytical solution. The research findings demonstrate that the fractional-order numerical scheme can more accurately simulate the chloride concentration in concrete containing fly ash or slag. Additionally, the model shows promise in predicting the service life of fly ash or slag concrete.

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3D meso-scale simulation of chloride ion transportation in cracked concrete considering aggregate morphology

Cited by 16 publications

References 48 publications

Three-Dimensional Multi-Phase Microscopic Simulation of Service Life of Recycled Large Aggregate Self-Compacting Concrete

Three-Dimensional Multi-Phase Microscopic Simulation of Service Life of Recycled Large Aggregate Self-Compacting Concrete

Effect of Interface Transition Zone and Coarse Aggregate on Microscopic Diffusion Behavior of Chloride Ion

Fractional-order numerical modeling to study chloride ion transport in concrete with fly ash or slag additions

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