Influence of cation type on diffusion behavior of chloride ions in concrete

Zhang, Song; Jiang, Linhua; Liu, Jianzhong; Liu, Jiaping

doi:10.1016/j.conbuildmat.2015.09.033

Cited by 39 publications

(10 citation statements)

References 17 publications

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“…One of the major durability issues that the construction industry is facing globally is the materials' structural degradation [14][15][16][17]. This may lead to reductions in strength, reinforcement corrosion, as well as aesthetics issues, which would require early repair or replacement of the structure [18].…”

Section: Introductionmentioning

confidence: 99%

“…While considerable research efforts have dealt with concrete behavior with respect to chloride penetration [10,16,38,39,43] and the effect of sodium chloride in mortars [42,44], there is currently a clear lack of knowledge on the effect of carbon nanotube (CNT) presence on chloride penetration in state-of-the-art nano-modified mortars intended for future exploitation in real constructions. The main purpose of the present study is to address the effect of chloride penetration in carbon nanotube-modified cementitious materials subjected to marine environments.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Carbon Nanotubes on Chloride Penetration in Cement Mortars

et al. 2019

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The study investigates the effect of carbon nanotubes on chloride penetration in nano-modified mortars and reports on the physical, electrical, and mechanical performance of the material. Mortars were artificially corroded and their surface electrical surface conductivity as well as flexural and compressive strength were measured. The influence of variable nanotube concentration in accelerated corrosion damage was evaluated. Nanotube concentration was found to significantly affect the permeability of the mortars; improvements in flexural and compressive response of mortars exposed to salt spray fog, compared to virgin specimens, were rationalized upon decreases in the apparent porosity of the materials due to filling of the pores with sodium chloride. Electrical resistivity was found to increase up to two orders of magnitude with respect to the surface value; above the percolation threshold, the property impressively increased up to five orders of magnitude.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Carbon Nanotubes on Chloride Penetration in Cement Mortars

et al. 2019

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“…The studied CEMII concrete is taken from the literature (14). The cement composition and the concrete mix-design are given in Tables 4 and 5, respectively.…”

Section: Concrete Propertiesmentioning

confidence: 99%

“…Chemical composition of cement, expressed as a percentage (%)(14).Composition SiO 2 Al 2 O 3 F e 2 O 3 CaO M gO SO 3 N a 2 O K 2 O…”

mentioning

confidence: 99%

A numerical model including thermodynamic equilibrium, kinetic control and surface complexation in order to explain cation type effect on chloride binding capability of concrete

Tran

Soive

Bonnet

et al. 2018

Construction and Building Materials

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The impact of cation type, sulphate and pH on chloride binding is studied using a numerical model combining thermodynamic equilibrium, kinetics and surface complexation. First, the model is validated by comparing numerical and experimental results obtained on a CEM II concrete material exposed to N aCl, KCl, M gCl 2 and CaCl 2 solutions. Then, the numerical results are discussed to improve our understanding of the differences in chloride binding capability generally observed in the literature. A strong coupling between cation, pH and sulfate affecting chloride binding is highlighted. After six months of exposure, chloride binding due to Kuzel's salt formation has little effect on chloride binding capability whatever the chloride salt solution. The results also confirm the existence of a relationship between pH and chloride binding capability previously observed experimentally in the literature. When some sulfate ions are present in the chloride solution, they reduce

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“…This filed of science represents a power potential and has been deeply studied by numerous researchers for its extensive applications such as the transport of heavy ions in soil [1,2], groundwater contamination [3], nuclear waste disposal [4][5][6] and the marine structure anticorrosion [7][8][9]. To understand the mechanism of the ion diffusion in such charge porous materials, copious experiments were preformed and simplified empirical models were proposed to calculate the effective ion diffusion coefficients and to understand the long-term behavior of ion diffusion [6,[10][11][12][13][14][15][16]. For example, Tachi et al [14] and Glaus et al.…”

Section: Introductionmentioning

confidence: 99%

Upscaling scheme for long-term ion diffusion in charged porous media

Yang

Wang

2017

Phys. Rev. E

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Description of long-term (over years) ion diffusion at the pore scale is a huge challenge since the characteristic time of diffusion in a typical representative elementary volume is around microseconds, generally ten orders of magnitude lower than the time we were concerned with. This paper presents a numerical upscaling scheme for ion diffusion with electrical double-layer effects (electrodiffusion) considered in charged porous media. After a scaling analysis for the nondimensional governing equations of ion transport at the pore scale, we identify the conditions for decoupling of electrical effect and diffusion, and therefore are able to choose apposite temporal and spatial scales for corresponding directions of the electrodiffusion process. The upscaling scheme is therefore proposed based on a numerical framework for governing equations using a lattice Boltzmann method. The electrical potential or concentration profiles from steady- or unsteady-state electrodiffusion in the long, straight channel, calculated by this upscaling scheme, are compared with the well-meshed full-sized simulations with good agreement. Furthermore, this scheme is used to predict tracer-ion throughdiffusion and outdiffusion in hardened cement pastes. All numerical results show good agreement with the full-sized simulations or experiment data without any fitting parameters. This upscaling scheme bridges the ion diffusion behaviors in different time scales, and may help to improve the understanding of long-term ion transport mechanisms in charged porous media.

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Influence of cation type on diffusion behavior of chloride ions in concrete

Cited by 39 publications

References 17 publications

Effect of Carbon Nanotubes on Chloride Penetration in Cement Mortars

Effect of Carbon Nanotubes on Chloride Penetration in Cement Mortars

A numerical model including thermodynamic equilibrium, kinetic control and surface complexation in order to explain cation type effect on chloride binding capability of concrete

Upscaling scheme for long-term ion diffusion in charged porous media

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