Modelling of time dependency of chloride diffusion coefficient in cement paste |
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Authors: | Mingzhong Zhang and Guang Ye |
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Affiliation: | (1) Faculty of Civil Engineering and Architecture, Zhejiang University of Technology, 310014 Hangzhou, People’s Republic of China;(2) State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, 116024 Dalian, People’s Republic of China |
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Abstract: | A computer-based model and method was presented to predict the time dependency of chloride diffusion coefficients in cement
paste. The HYMOSTRUC3D model was applied to generate a 3D representative elementary volume (REV) of cement paste. In the simulation
of microstructure, both of cement hydration and chloride binding were considered. With the simulated microstructure of cement
paste, the finite element method was applied to simulate the diffusion process of chloride through the saturated cement paste.
Based on the 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 were evaluated. The simulated chloride diffusivities with various w/c at different time were compared to experimental data obtained from the literature. The experimental results indicate that
the chloride diffusion coefficient decreases with the increase of time and the 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. |
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