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Analytical modelling of the coupling between microstructure and effective diffusivity of cement based materials



Title: Analytical modelling of the coupling between microstructure and effective diffusivity of cement based materials
Author(s): W. Dridi
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: 233 - 241
Total Pages: 9
Nb references: 15
Language: English


Abstract: This paper presents a simplified composite model, namely Microtrans, which considers the contribution of each phase participating to the transport within OPC pastes. At the micrometer scale, the phases considered hereafter are capillary porosity (macro-porosity) and the Low Density and the High Density C-S-H both containing gel pores (nano-porosity). Predicted values of tritiated water diffusivity in OPC pastes with various (w/c) ratios are confronted to experimental results and revels a good agreement. This model is able to estimate the diffusion coefficient evolution according to porosity opening or plugging during a degradation scenario.
The obtained porosity-diffusion law is used to predict the transport properties in concretes and mortars from analytical homogenisation model.


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