A multiphase numerical simulation of chloride ions diffusion in concrete using electron microprobe analysis for characterizing properties of ITZ

Tian, Ye; Tian, Zushi; Jin, Nanguo; Jin, Xianyu; Yü, Wei

doi:10.1016/j.conbuildmat.2018.05.047

Cited by 44 publications

(6 citation statements)

References 23 publications

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“…5, the aggregate, ITZ and cement paste can be distinguished by the Ca/Si 221 ratios distribution. The ITZ is a thin layer surrounding aggregate, which is characterized by a 222 higher concentration of calcium hydroxide crystals and an increased porosity relative to the 223 cement paste [67,68]. The hydration produces Ca(OH)2 and C-S-H gel with a mean Ca/Si ratio of 1.8-4.9 [69].…”

Section: Mercury Intrusion Porosimetry (Mip) Testmentioning

confidence: 99%

Evolution of ITZ and its effect on the carbonation depth of concrete under supercritical CO2 condition

et al. 2022

Cement and Concrete Composites

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Section: Mercury Intrusion Porosimetry (Mip) Testmentioning

confidence: 99%

Evolution of ITZ and its effect on the carbonation depth of concrete under supercritical CO2 condition

et al. 2022

Cement and Concrete Composites

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“…For concrete with internal RH of above 75%, the results above highlighted that the increasing internal RH was helpful to the chloride migration in concrete, and relatively low RH required more time to migrate enough chloride ion. Analyzing the reason was that the chloride penetration was mainly by the medium of water, the chloride penetration into concrete was mainly by massive water-saturated passageways [32][33][34]. e decreasing RH resulted in a decrease in the number of water-saturated passageways in concrete and thus the chloride migration was decreased.…”

Section: Chloride Penetration Into Concrete With Various Internalmentioning

confidence: 99%

Chloride Penetration into Concrete under the Coupling Effects of Internal and External Relative Humidity

Fang

Ming-min

2020

Advances in Civil Engineering

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Chloride penetration frequently happens in an unsaturated concrete; in this case, the chloride migration is under the coupling effects of internal moisture and external relative humidity (RH). Various chloride attack tests were designed in this paper to investigate the effects of internal moisture and external RH (50–100%) on the chloride penetration into an unsaturated concrete, and the chloride content was determined to quantify the chloride migration in concrete. The results highlighted that there was a good correlation between the chloride penetration into concrete and its internal RH. The chloride ion was difficult to penetrate into concrete when its internal RH was below 50%; however, the chloride penetration rate increased when the internal RH of concrete was above 75%, and the chloride migration increased with increasing RH and exposure duration. Water evaporation in concrete increased with decreasing external RH, and an obvious increase in the surface chloride content may be observed when external RH was 50%; however, when external RH was above 75%, the inner chloride content increased and surface chloride content decreased with increasing exposure duration. Simulating the chloride penetration under wet-dry cycling, the water migration resulted in an increase in the surface chloride content and a decrease in the inner chloride content, and the chloride crystal precipitated on the surface of concrete with a high w/c ratio.

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“…However, high porosity and connectivity provide convenient conditions for water and ion transport. Yang et al [20,21] and Ye et al [22] studied the influence of ITZ on chloride ion diffusion by using prefabricated cylinders instead of aggregate. The study showed that the chloride ion diffusion coefficient of ITZ was about 30-50 times that of cement paste, indicating that the existence of ITZ greatly promoted the chloride ion permeability.…”

Section: Introductionmentioning

confidence: 99%

“…The study showed that the chloride ion diffusion coefficient of ITZ was about 30-50 times that of cement paste, indicating that the existence of ITZ greatly promoted the chloride ion permeability. Moreover, Huang et al [22] used a similar method to investigate the influence of ITZ on water transmission, and found that ITZ has high permeability. The permeability coefficient of ITZ is 20 times that of ordinary cement paste.…”

Section: Introductionmentioning

confidence: 99%

Effect of Interface Transition Zone and Coarse Aggregate on Microscopic Diffusion Behavior of Chloride Ion

et al. 2022

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Concrete is a multiphase composite material composed of coarse aggregate, cement mortar, and interface transition zone (ITZ). It is of great significance to study the effect of ITZ and coarse aggregate on chloride microscopic diffusion behavior for predicting the service life of reinforced concrete (RC) structures. By introducing the random distribution function, a random coarse aggregate model considering the randomness of the thickness of the ITZ was established. Furthermore, a two-dimensional (2D) chloride ion diffusion mesoscopic model was developed by specifying different diffusion properties for different phase materials of concrete. Moreover, the effects of coarse aggregate rate, ITZ thickness, and ITZ diffusion property on chloride ion diffusion behavior were investigated in this paper. The research showed that the aggregate has hindrance and agglomeration action on chloride ion diffusion. Although the volume content of the ITZ was very small, less than 0.2% of the total volume of concrete, the effect of the ITZ on the chloride diffusion in concrete cannot be ignored. More importantly, the mechanism of promoting chloride diffusion in the ITZ was revealed through the chloride diffusion trajectory. The research revealed the transmission mechanism of chloride ions in the meso-structure of concrete and provides theoretical support for the design of RC structures in coastal areas.

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A multiphase numerical simulation of chloride ions diffusion in concrete using electron microprobe analysis for characterizing properties of ITZ

Cited by 44 publications

References 23 publications

Evolution of ITZ and its effect on the carbonation depth of concrete under supercritical CO2 condition

Evolution of ITZ and its effect on the carbonation depth of concrete under supercritical CO2 condition

Chloride Penetration into Concrete under the Coupling Effects of Internal and External Relative Humidity

Effect of Interface Transition Zone and Coarse Aggregate on Microscopic Diffusion Behavior of Chloride Ion

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