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Modelling of time dependency of chloride diffusion coefficient in cement paste

MZ Zhang and Guang Ye (UGent)
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Abstract
Because of continuous cement hydration and chloride binding during the process of chloride diffusion, the chloride diffusion coefficient changes with time. This paper presents a computer-based model and method to predict the time dependency of chloride diffusion coefficients in cement paste. The HYMOSTRUC3D model is applied to generate a 3D representative elementary volume (REV) of cement paste. In the simulation of microstructure, both of cement hydration and chloride binding are considered. With the simulated microstructure of cement paste, the finite element method is applied to simulate the diffusion process of chloride through the saturated cement paste. Based on Fick's first law, the chloride diffusion coefficient can be calculated. In this method, the influences of age and w/c ratio on the chloride diffusion coefficient are evaluated. The simulated chloride diffusivities with various w/c at different time are compated to experimental data obtained from the literature. The results indicate that the chloride diffusion coefficient decreases with increase of time and decrease of w/c ratio. The trend of simulated relationship (diffusion coefficient vs time, diffusion coefficient vs w/c ratio) fits very well with the experiments.
Keywords
chloride binding, time dependency, HYMOSTRUC3D, chloride diffusion coefficient, Cement paste

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Chicago
Zhang, MZ, and Guang Ye. 2010. “Modelling of Time Dependency of Chloride Diffusion Coefficient in Cement Paste.” In 1st International Conference on Sustainable Construction Materials : Design, Performance and Application, Proceedings, ed. Zhonghe Shui, Shaopeng Wu, and Jianying Yu, 496–504. Wuhan, China: Wuhan University of Technology Press.
APA
Zhang, MZ, & Ye, G. (2010). Modelling of time dependency of chloride diffusion coefficient in cement paste. In Z. Shui, S. Wu, & J. Yu (Eds.), 1st international conference on sustainable construction materials : design, performance and application, Proceedings (pp. 496–504). Presented at the 1st International Conference on Sustainable Construction Materials : Design, Performance and Application (SUSCOM - 2010), Wuhan, China: Wuhan University of Technology Press.
Vancouver
1.
Zhang M, Ye G. Modelling of time dependency of chloride diffusion coefficient in cement paste. In: Shui Z, Wu S, Yu J, editors. 1st international conference on sustainable construction materials : design, performance and application, Proceedings. Wuhan, China: Wuhan University of Technology Press; 2010. p. 496–504.
MLA
Zhang, MZ, and Guang Ye. “Modelling of Time Dependency of Chloride Diffusion Coefficient in Cement Paste.” 1st International Conference on Sustainable Construction Materials : Design, Performance and Application, Proceedings. Ed. Zhonghe Shui, Shaopeng Wu, & Jianying Yu. Wuhan, China: Wuhan University of Technology Press, 2010. 496–504. Print.
@inproceedings{1619057,
  abstract     = {Because of continuous cement hydration and chloride binding during the process of chloride diffusion, the chloride diffusion coefficient changes with time. This paper presents a computer-based model and method to predict the time dependency of chloride diffusion coefficients in cement paste. The HYMOSTRUC3D model is applied to generate a 3D representative elementary volume (REV) of cement paste. In the simulation of microstructure, both of cement hydration and chloride binding are considered. With the simulated microstructure of cement paste, the finite element method is applied to simulate the diffusion process of chloride through the saturated cement paste. Based on Fick's first law, the chloride diffusion coefficient can be calculated. In this method, the influences of age and w/c ratio on the chloride diffusion coefficient are evaluated. The simulated chloride diffusivities with various w/c at different time are compated to experimental data obtained from the literature. The results indicate that the chloride diffusion coefficient decreases with increase of time and decrease of w/c ratio. The trend of simulated relationship (diffusion coefficient vs time, diffusion coefficient vs w/c ratio) fits very well with the experiments.},
  author       = {Zhang, MZ and Ye, Guang},
  booktitle    = {1st international conference on sustainable construction materials : design, performance and application, Proceedings},
  editor       = {Shui, Zhonghe and Wu, Shaopeng and Yu, Jianying},
  isbn         = {9787900503053},
  keyword      = {chloride binding,time dependency,HYMOSTRUC3D,chloride diffusion coefficient,Cement paste},
  language     = {eng},
  location     = {Wuhan, China},
  pages        = {496--504},
  publisher    = {Wuhan University of Technology Press},
  title        = {Modelling of time dependency of chloride diffusion coefficient in cement paste},
  year         = {2010},
}