A study on application of the lattice Boltzmann method for mass transport in concrete

Authors: T. Shima, T. Saeki
Paper category: conference
Book title: Concrete Durability and Service Life Planning – ConcreteLife’09
Editor(s): K. Kovler
Print ISBN: 978-2-35158-074-5
e-ISBN: 978-2-35158-085-1
Publisher: RILEM Publications SARL
Publication year: 2009
Pages: 270 – 276
Total Pages: 7
Language: English

Abstract: The lattice Boltzmann method (LBM) is a discrete model for the fluid flow. LBM is a technique for the numerical solution of the incompressible Navier-Stokes equation. LBM has recently attracted considerable attention in the anticipation of simulating fluid flows in porous media, such as concrete. In this study, the flow of gas and the diffusion of chloride ions in concrete were simulated by LBM. Concrete was modeled as media by arranging the solid wall on the grid point. The probability that the solid wall existed in the grid point was given as a parameter. Therefore, the ratio of the space which is not occupied by the solid wall means the porosity of concrete. LBM simulation results of mass transport in concrete showed the same trend as the experimental results. The typical results are as follows:
1) The gas permeability of concrete is proportional to the porosity of concrete;
2) By considering electric ionic exchange of chloride ions for hydroxide ions, the concentration of chloride ions in pore solution becomes larger than that of external solution;
3) In the case of the lower porosity concrete, the apparent diffusion coefficient of chloride ions in concrete decreased with time, even if the porosity does not change.

Online publication: 2012-05-16
Publication Type: full_text
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