Effects of aggregate and interface characteristics on chloride diffusion in concrete based on 3D random aggregate model

Lei, Yu; Liu, Chunhui; Mei, Hua; Xia, Yu; Liu, Zhen; Xu, Feng; Zhou, Cuiying

doi:10.1016/j.conbuildmat.2021.125690

Cited by 14 publications

(3 citation statements)

References 33 publications

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“…With the rapid development of computer science and numerical modelling, and also its strength in saving test time and cost, the establishment of numerical prediction models has attracted more scientific attention. Fick's law has been widely adopted to depict the penetration of single chloride species [25,29,30]. Subsequently, the thermodynamic modelling approach has been adopted to depict the chemical reaction between ionic species and the hydrated cement system [31,32].…”

Section: Multi-species Transport In Concrete Pore Solutionmentioning

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: Multi-species Transport In Concrete Pore Solutionmentioning

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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“…He provided a reliable method for predicting compressive strength. Second, by analyzing the concrete composition and using computer programming to create a random aggregate model (RAM) [11] that meets the requirements, Sharif et al [12] simulated samples of biphasic cubic concrete containing spherical aggregates embedded in homogeneous mortar and successfully demonstrated the failure modes of the pieces. After the characterization of the mesoscale aggregate composition method is completed, there are two methods of computational modeling: one is an FEM based on a RAM [11], and the other is a mechanical model based on a discrete element model (DEM) [13].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Fatigue Life of Rubber Concrete on the Mesoscale

Pei

Huang

et al. 2023

Polymers

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Rubber concrete (RC) exhibits high durability due to the rubber admixture. It is widely used in a large number of fatigue-resistant structures. Mesoscale studies are used to study the composition of polymers, but there is no method for fatigue simulation of RC. Therefore, this paper presents a finite element modeling approach to study the fatigue problem of RC on the mesoscale, which includes the random generation of the main components of the RC mesoscale structure. We also model the interfacial transition zone (ITZ) of aggregate mortar and the ITZ of rubber mortar. This paper combines the theory of concrete damage to plastic with the method of zero-thickness cohesive elements in the ITZ, and it is a new numerical approach. The results show that the model can simulate reasonably well the random damage pattern after RC beam load damage. The damage occurred in the middle of the beam span and tended to follow the ITZ. The model can predict the fatigue life of RC under various loads.

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“…Zheng et al [16] modeled the aggregate, mortar, and transition zone separately and developed a numerical model to predict the chloride's difusion in concrete. Yu et al [17] studied the chloride difusion in concrete with diferent aggregate volume ratios (AVR) and interfacial transition zone (ITZ) by the random aggregate model. Zheng et al [18] proposed a numerical algorithm for evaluating the chloride difusion coefcient of concrete with crushed aggregates.…”

Section: Introductionmentioning

confidence: 99%

A Mesoscopic Model for Predicting the Chloride Diffusivity’ Representative Volume Element in Concrete as a Random Composite

Xie

Lin²,

Wu³

2022

Advances in Civil Engineering

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Chloride diffusivity is the most crucial factor for evaluating durability and predicting service life of concrete structures exposed to chloride environment. In the present paper, concrete is considered as a random heterogeneous composite of three phases: the aggregates, the matrix, and the interfacial transition zones (ITZ) between them. A mesoscopic model has been established based on the random aggregate model and a numerical model for calculating the chloride diffusivity has been proposed. The influences of aggregate size and the properties of the interfacial transition zones on chloride diffusivity of concrete are also discussed. The chloride diffusivity is size dependent because aggregates are randomly distributed in concrete. The chloride diffusivity under different sizes is analyzed by numerous numerical simulations, and the representative volume element (RVE) of chloride penetration into concrete is researched by the statistical method.

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Effects of aggregate and interface characteristics on chloride diffusion in concrete based on 3D random aggregate model

Cited by 14 publications

References 33 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

Numerical Simulation of Fatigue Life of Rubber Concrete on the Mesoscale

A Mesoscopic Model for Predicting the Chloride Diffusivity’ Representative Volume Element in Concrete as a Random Composite

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