On the mathematics of time-dependent apparent chloride diffusion coefficient in concrete

By Luping Tang, J. Gulikers. 2007

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A variable-order time-fractional derivative model for chloride ions sub-diffusion in concrete structures (2012, background): “However, many experiments and field observations illustrate that the diffusion coefficient is not of a constant, but a time-dependent parameter decreasing with concrete age [34, 28, 36].”
A comprehensive probabilistic model of chloride ingress in unsaturated concrete (2011, background): “However, this analytical solution is not valid neither for curvefitting exposure data nor for predictions because the di↵usivity and the surface chloride content are both time-dependent [31, 32].”