Multi-scale prediction of the effective chloride diffusion coefficient of concrete

Sun, Guogang; Zhang, Yunsheng; Sun, Wei; Liu, Zhiyong; Wang, Caihui

doi:10.1016/j.conbuildmat.2011.03.041

Cited by 144 publications

(50 citation statements)

References 17 publications

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“…Sun et al [11] confirmed that it may not appropriate to assume a homogenous characteristic of concrete diffusion along its depth. In fact, many factors affect the ionic transport properties of chloride into concrete i.e.…”

Section: Introductionmentioning

confidence: 77%

Estimating Corrosion Initiation Period Due to Chloride Ingress into Reinforced Self-Compacting Concrete Incorporating High Volume Fly Ash

2017

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Abstract.One of the main sources of reinforcement corrosion is the ingress of chloride ion into a concrete structure. The rate of chloride ingress and its consequence to initiate corrosion could determine the service life of the structure. This paper aims to estimate the corrosion initiation period of reinforced self-compacting concrete incorporating high volume fly ash. The governing equation whih characterize the chloride ingress through ionic diffusion is numerically solved using finite difference method. The numerical solutions are used to assess the influence of fly ash content, concrete cover and temperature on the time of corrosion initiation.

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Section: Introductionmentioning

confidence: 77%

Estimating Corrosion Initiation Period Due to Chloride Ingress into Reinforced Self-Compacting Concrete Incorporating High Volume Fly Ash

2017

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“…Most of the existing multiphase models (Bentz & Garboczi, 1991;Bourdette et al, 1995;Caré, 2003;Caré & Hervé, 2004;Garboczi & Bentz, 1998;Jiang et al, 2013;Sun et al, 2011;Xiao et al, 2012;Yang & Weng, 2013;Ying et al, 2013;Zeng, 2007;Zheng et al, 2009) including previous work as well (Feng et al, 2016;Šavija et al, 2014), assumed circular or spherical aggregates for simplification. Figure 1 shows one of the 2-D concrete numerical models with the size of 50 mm × 50 mm.…”

Section: Modelingmentioning

confidence: 99%

“…For the cases of diffusion tests, the transport of ions in a saturated concrete is mainly driven by the concentration gradient of the species itself and can be described as Fick's first law, which is most utilised in the durability study of the cracked concrete (Abyaneh et al, 2013;Bentz & Garboczi, 1991;Bourdette et al, 1995;Caré, 2003;Caré & Hervé, 2004;Garboczi & Bentz, 1998;Jiang et al, 2013;Sun et al, 2011;Xiao et al, 2012;Yang & Weng, 2013;Ying et al, 2013;Zeng, 2007;Zheng et al, 2009Zheng et al, , 2012. When the electrostatic potential is involved such as in migration tests (Whiting, 1981;AASHTO T 277, 1983;ASTM C 1202ASTM C , 1994Tang & Nilsson, 1993a;NT-Build 492, 1999;AASHTO TP 64-03, 2003), the more significant driving force of ionic transport is the electrostatic potential gradient, in which case the flux of an ionic species can be expressed using the Nernst-Planck equation as follows:…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…As neither of the abovementioned method is appropriate to tackle the influences of individual components on chloride transport in concrete, finite element numerical models, originally developed for the stress analysis of concrete, have recently been applied to investigate the transport properties of concrete with multiple phases (Bentz & Garboczi, 1991;Bourdette, Ringot, & Ollivier, 1995;Caré, 2003;Caré & Hervé, 2004;Garboczi & Bentz, 1998;Jiang, Sun, & Wang, 2013;Li, Xia, & Lin, 2012;Sun, Zhang, Sun, Liu, & Wang, 2011;Xiao, Ying, & Shen, 2012;Yang & Weng, 2013;Ying, Xiao, Shen, & Bradford, 2013;Zeng, 2007;Zheng, Wong, & Buenfeld, 2009). By using this type of multiphase computational model, one can easily clarify and quantify the influence cause by different structure of concrete, i.e., inclusion aggregates, mortar/cement, and interfacial transition zones (ITZs), which cannot be fulfilled in 1-D analytical models.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Aggregate Shape Effect on Multicomponent Ionic Electromigration in Concrete

Liu¹,

Li²,

Yang³

2016

Proceedings of the 5th International Conference on the Durability of Concrete Structures

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This paper presents a numerical study on the mechanism of chloride migration in concrete. Unlike most of existing work, this study utilises multicomponent ionic transport models to reflect the influence of ionic interactions by coupling both mass conservation and Poisson's equations. A series of 2-D, 3-phase models with different shapes and volume fractions of aggregates are developed to simulate the chloride migration test. Through a comparatively overall numerical exploration that considers external voltage, ionic interactions, heterogeneous nature, ITZ, and ionic binding, some important features about multispecies coupling and aggregate shape effect, which have not been properly reported from existing concrete models, are highlighted.

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“…Using a semi-empirical, three-phase composite sphere model, however, Zheng et al (2009) indicated that the influence of ITZ on the overall steady-state chloride diffusivity is small, despite it being on average more porous and itself having a diffusivity that is several times that of the bulk paste. In addition, a multi-scale model proposed by Sun et al (2011) predicts that the chloride diffusivity of concrete composite materials depends on the chloride diffusion coefficient of the bulk paste and ITZ. All these inconsistent results from different sources underscore the difficulty in isolating and determining the ITZ effect when preparing and testing samples with different aggregate content.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Interfacial Transition Zone and Interconnection on Chloride Migration of Portland Cement Mortar

Schutter

et al. 2015

ACT

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Available experimental studies on the effect of the interfacial transition zone (ITZ) on transport properties of cement-based composite materials appear to be ambiguous. The main objective of this work was to enhance the understanding of the relationship between ITZ and transport properties of Portland cement-based materials by using both a rapid chloride migration test and theoretical calculations. A densification factor which is related to aggregate volume content was introduced to further determine the transport properties of ITZ. Results indicate that the overall porosity decreased with increasing aggregate volume content due to the dilution effect by impermeable aggregates. The porosity was above the theoretical dilution line obtained from P 0 ×(1-V agg ) for mortars with more than 20% of aggregate, which can be attributed to the presence of high porous ITZ. On the other hand, more porous ITZ was expected to be accompanied by a denser bulk cement matrix, which leaded to a decrease in the porosity of mortar with less than 35% of aggregate. The ITZ effect would dominate the blocking aggregate, densification and tortuosity of bulk paste when aggregate volume content exceeded 0.35. The ratio between the migration coefficient of the ITZ and that of the matrix (D ITZ /D matrix ) increased with aggregate volume content and assumed ITZ thickness. In addition, the influence of ITZ increased with increasing the degree of interconnection slightly until 1.0. Beyond this value, a sudden increase in D ITZ /D matrix ratio was observed indicating the negative percolation effect when the adjacent ITZ start to interconnect.

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Multi-scale prediction of the effective chloride diffusion coefficient of concrete

Cited by 144 publications

References 17 publications

Estimating Corrosion Initiation Period Due to Chloride Ingress into Reinforced Self-Compacting Concrete Incorporating High Volume Fly Ash

Estimating Corrosion Initiation Period Due to Chloride Ingress into Reinforced Self-Compacting Concrete Incorporating High Volume Fly Ash

Aggregate Shape Effect on Multicomponent Ionic Electromigration in Concrete

Influence of the Interfacial Transition Zone and Interconnection on Chloride Migration of Portland Cement Mortar

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