Time/depth dependent diffusion and chemical reaction model of chloride transportation in concrete

Sun, Yung-Ming; Liang, Ming-Te; Chang, Ta‐Peng

doi:10.1016/j.apm.2011.07.053

Cited by 66 publications

(24 citation statements)

References 11 publications

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“…When the binding effect of chloride is considered, the concentration of free chloride is reduced such that the coefficient of chloride diffusion is also reduced simultaneously [19]. Therefore, the diffusion-reaction model would predict a longer corrosion initiation time than the models that do not consider the effect of chloride binding during the chloride diffusion process [9]. The chloride binding chemical reaction occurs between chloride ions and the C 3 A, C 4 AF, and their hydration products that results in the formation of Friedel's salt as the product of the reaction [10].…”

Section: The Influence Of Chloride Binding On the Coefficient Of Chlomentioning

confidence: 99%

“…Microstructure of concrete also changes with time at various locations. Therefore, both the chloride ion concentration and chloride diffusivity vary with time and space [9]. The coefficient of chloride diffusion decreases with time because the capillary pore structure is altered due to the continuous formation of hydration products [26,27].…”

Section: The Effect Of Time and Space On The Coefficient Of Chloride mentioning

confidence: 99%

“…This process is often described by Fick's second law of diffusion [8]. Crank gave the solution of this governing partial differential equation with semi-infinite boundary conditions and assumed the coefficient of chloride diffusion as a constant [9]. However, various researchers have reported that the coefficient of chloride diffusion varies with time and space 2 International Journal of Corrosion [10].…”

Section: Introductionmentioning

confidence: 99%

“…However, various researchers have reported that the coefficient of chloride diffusion varies with time and space 2 International Journal of Corrosion [10]. The effects of chloride binding and multidirectional chloride ingress on chloride diffusion coefficient are also reported [9,11,12].…”

Section: Introductionmentioning

confidence: 99%

“…Chlorides diffusing inside concrete can be either dissolved in the pore solution or bound to the cement hydrates chemically and physically along the diffusion path [9]. Therefore, we can divide total chloride into bound and free chloride.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Chloride-Induced Corrosion of Steel in Concrete: An Overview on Chloride Diffusion and Prediction of Corrosion Initiation Time

Khan

Ahmad

Al-Gahtani

2017

International Journal of Corrosion

106

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Initiation of corrosion of steel in reinforced concrete (RC) structures subjected to chloride exposures mainly depends on coefficient of chloride diffusion, , of concrete. Therefore, is one of the key parameters needed for prediction of initiation of reinforcement corrosion. Fick's second law of diffusion has been used for long time to derive the models for chloride diffusion in concrete. However, such models do not include the effects of various significant factors such as chloride binding by the cement, multidirectional ingress of chloride, and variation of with time due to change in the microstructure of concrete during early period of cement hydration. In this paper, a review is presented on the development of chloride diffusion models by incorporating the effects of the key factors into basic Fick's second law of diffusion. Determination of corrosion initiation time using chloride diffusion models is also explained. The information presented in this paper would be useful for accurate prediction of corrosion initiation time of RC structures subjected to chloride exposure, considering the effects of chloride binding, effect of time and space on , and interaction effect of multidirectional chloride ingress.

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Section: The Influence Of Chloride Binding On the Coefficient Of Chlomentioning

confidence: 99%

Section: The Effect Of Time and Space On The Coefficient Of Chloride mentioning

confidence: 99%