Multi-scale modelling of ionic diffusivity, compression and tensile tests on mortar

Title: Multi-scale modelling of ionic diffusivity, compression and tensile tests on mortar
Author(s): S. Kamali-Bernard, F. Bernard, W. Prince
Paper category : conference
Book title: International RILEM Symposium on Concrete Modelling - ConMod '08
Editor(s): E. Schlangen and G. De Schutter
Print-ISBN: 978-2-35158-060-8
e-ISBN: 978-2-35158-076-9
Publisher: RILEM Publications SARL
Publication year: 2008
Pages: 809 - 817
Total Pages: 9
Nb references: 17
Language: English

Abstract: A three-dimensional numerical multiscale approach is developed to predict transport and mechanical properties of cement-based materials starting from the microstructure scale. The model works in two steps. The first step consists in generating 3D representative volume elements (RVE) of the material at different scales. The second step consists in computing the performances of these RVE using a finite element software. Computations performed at one scale provide input properties to be used in simulations of performance at the next higher scale. The model is then applied on mortars to simulate tritiated water diffusion, unidirectional tensile and compression tests. The diffusivity is calculated using Fick’s law.
The model results on cement pastes and mortars are then compared successfully to the experimental ones. An approximation of tritiated water diffusivity value of C-S-H phase is given by simulating cement paste with w/c ratio of 0.25. The influence of ITZ properties is also discussed.

Online publication: 2009-06-15
Publication type : full_text
Public price (Euros): 0.00