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Gas Diffusion in Cement Pastes: An Analysis using a Fluctuating Diffusivity Model by Nakai, Fumiaki; Ishida, Takato is a scholarly article available to read on EtoBox.

What is Gas Diffusion in Cement Pastes: An Analysis using a Fluctuating Diffusivity Model about?

This work propose an application of the concept of fluctuating diffusivity to the diffusion of gas molecules in cementitious materials, particularly through a two-state fluctuating diffusivity (2SFD) model. The 2SFD model is utilized to investigate the diffusion of oxygen in cement pastes. The analysis provides a reasonable description of the diffusion coefficient of oxygen in cement pastes, and highlights the presence of non-Gaussian diffusion, which can be attributed to the heterogeneous microstructure. The presence of non-Gaussianity in the probability density of the molecule's displacement, characterized by heavier tails than those of the Gaussian distribution, may have a significant impact on the durability assessments of concrete structures.

Author

Nakai, Fumiaki; Ishida, Takato

Published

2023

Language

EN