Multi-scale modelling and statistical analysis of heterogeneous characteristics effect on chloride transport properties in concrete

Tong, Liang-yu; Xiong, Qing Xiang; Zhang, Mingzhong; Meng, Zhaozheng; Meftah, Fékri; Li, Qingfeng

doi:10.1016/j.conbuildmat.2022.130096

Cited by 41 publications

(2 citation statements)

References 99 publications

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“…[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]. Due to the differences in the charge properties and diffusion rates of various ions, it will generate charge imbalance between multi-species and create an electrostatic potential in local area of the concrete, which may affect the transportation of every ionic species [51][52][53].…”

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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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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“…The different volumes and distributions of the components play an important role in determining the mechanical response of concrete subjected to external load [8]. Various attempts have been made to incorporate the heterogeneous nature of concrete through indirect methods, most of which are based on statistical algorithms to randomly generate and distribute the components of the concrete [9][10][11][12]. These methods allow the rapid establishment of heterogeneous numerical models of concrete with reasonable precision.…”

Section: Introductionmentioning

confidence: 99%

Characterizing Splitting Failure of Concrete Influenced by Material Heterogeneity Based on Digital Image Processing Techniques

Lin,

Li,

et al. 2024

Buildings

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Concrete, as a composite material, is subject to heterogeneity in its mechanical properties and damage characteristics responding to load. In this paper, a numerical approach for analyzing the heterogeneous characteristics and the mechanical behavior of concrete specimens in tensile splitting tests using DIP techniques is introduced. The experiment involves the preparation of three types of concrete specimens with different strengths and performances of the tensile splitting test. The contour and position information of the different components in the split surface of a concrete specimen are reflected in the numerical model using the DIP techniques and the fracture of the split surface is realized by three types of cohesive elements in the finite element software ABAQUS. The results of the proposed numerical model are highly consistent with the experimental results with a maximum error of 4.77%, whereby the evolution of the splitting process is discussed. The simulation shows that the concrete fracture develops from the periphery towards the center of the concrete and the ITZ region splits first at similar strain levels, followed by the mortar region and finally the aggregate region. In addition, a simplified modeling scheme with faster computational efficiency and higher accuracy is proposed, which indicates that the shape of the heterogeneous components in concrete has a low effect on mechanical strength. The proposed model can accurately reflect the splitting fracture process of concrete which is instantaneous in the actual process, contributing to the understanding of the mechanism of the splitting fracture process and proposing a new methodology for simulating the fracture process of heterogeneous materials (e.g., concrete, rock). This work contributes to the understanding of the effect of material heterogeneity on concrete’s mechanical behavior and fracturing process and provides valuable hints for the research on the non-destructive prediction of concrete strength.

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Seismic Vulnerability Assessment of Deteriorating Pile Foundations in Marine Environments

Shao

Shi

et al. 2023

Geotech Geol Eng

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Multi-scale modelling and statistical analysis of heterogeneous characteristics effect on chloride transport properties in concrete

Cited by 41 publications

References 99 publications

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

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

Characterizing Splitting Failure of Concrete Influenced by Material Heterogeneity Based on Digital Image Processing Techniques

Seismic Vulnerability Assessment of Deteriorating Pile Foundations in Marine Environments

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