Prediction of chloride diffusion coefficients using multi-phase models

Liu, Qingfeng; Easterbrook, Dave; Li, Long-yuan; Li, Dawang

doi:10.1680/jmacr.16.00134

Cited by 41 publications

(13 citation statements)

References 54 publications

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“…The shapes of aggregates in real concrete are unlikely to be perfectly spherical. However, some works have demonstrated that the effect of the shape of aggregates on the chloride diffusivity in concrete is not significant [21,22]; whereas in some cases (such as 3-D dimensions, migration process, recycled aggregates) its effect may be important [10,[23][24][25][26]. For each aggregate there is an ITZ surrounding it, and the thickness of the ITZ is assumed to be identical.…”

Section: Fig 1 Schematic Of the Cracked Concretementioning

confidence: 99%

Influence of cracks on chloride diffusivity in concrete: A five-phase mesoscale model approach

Peng

Zhang

et al. 2019

Construction and Building Materials

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134

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：This paper presents a mesoscale numerical approach to investigate the chloride diffusivity in cracked concrete. Concrete is treated as a five-phase material, including cement paste, aggregate, interfacial transition zone (ITZ), crack, and damaged zone (DZ), for its heterogeneity. In the mesoscale model, the randomly distributed aggregates were treated as impermeable, whereas all other phases are assumed permeable but with different diffusion coefficients. It is assumed that the crack is located in the middle of the DZ, and there is a liner relationship of the chloride diffusion coefficients between the DZ and the crack. The developed mesoscale model is validated by comparing the simulation results with the experimental data. Finally, the influence of the DZ, such as the chloride diffusion coefficient, the width and length of the DZ, the width and length of the crack, on the penetration of chlorides in cracked concrete is examined and discussed.

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Section: Fig 1 Schematic Of the Cracked Concretementioning

confidence: 99%

Influence of cracks on chloride diffusivity in concrete: A five-phase mesoscale model approach

Peng

Zhang

et al. 2019

Construction and Building Materials

Self Cite

134

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“…e RH c value is estimated as 75% for ordinary Portland cement concrete [30,38]. By substituting equations (7) to (8) into equation (6), f(η) can be obtained:…”

Section: Modified Chloride Diffusion Model For Coastal Structuresmentioning

confidence: 99%

“…Growing attention has been paid to accurate predictions of the chloride penetration in concrete worldwide. e penetration of chloride ions in concrete is a complicated process, and diffusion is generally regarded as the primary transport mechanism in present service life calculations [7]. Collepardi [8] was the first who studied the diffusion characteristics of chloride ions in concrete based on Fick's second law.…”

Section: Introductionmentioning

confidence: 99%

Chloride Penetration in Coastal Concrete Structures: Field Investigation and Model Development

Zhuo

Yan

Yang

et al. 2019

Advances in Materials Science and Engineering

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Field measurements of 42 in-service reinforced concrete bridges in coastal environments of Southeast China, covering a wide range of service year, span length, and concrete mixture, were carried out to investigate the chloride penetration. 323 sets of chloride measurement data were collected in total and then analysed to optimize the parameters involved in the common chloride diffusion model derived based on Fick's second law. A modified chloride diffusion model was then proposed, taking into consideration a range of influencing factors including ambient temperature, relative humidity, stress state, carbon dioxide, chloride binding, and ageing. Verification of the modified model with field measurement data was performed. e sensitivity of the chloride diffusion to variations of each parameter was discussed in detail eventually.

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“…To deal with this, from the mechanics point of view, if the properties of each individual material involved in the concrete are known then the properties of the concrete composite should be predictable. For this concern, advanced numerical concrete models, which are originally developed for structural stress analysis [24], [25], have recently been utilized to investigate the ionic transport properties of concrete, treating it as a multi-phase composite material [26]- [42]. By using these multi-phase computational models, it can be easy to clarify and quantify the influence of the different component parts of concrete, i.e.…”

Section: Introductionmentioning

confidence: 99%

Ionic transport features in concrete composites containing various shaped aggregates: a numerical study

Liu

Feng

Xia

et al. 2018

Composite Structures

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179

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Prediction of chloride diffusion coefficients using multi-phase models

Abstract: Prediction of chloride diffusion coefficients in concrete using meso-scale multi-phase transport models

Cited by 41 publications

References 54 publications

Influence of cracks on chloride diffusivity in concrete: A five-phase mesoscale model approach

Influence of cracks on chloride diffusivity in concrete: A five-phase mesoscale model approach

Chloride Penetration in Coastal Concrete Structures: Field Investigation and Model Development

Ionic transport features in concrete composites containing various shaped aggregates: a numerical study

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