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Generation of numerical aggregates in a concrete RVE: influence of inclusions geometric parameters on the macroscopic transport properties of the material



Author(s): T. de Larrard, B. Bary, E. Adam, F. Kloss
Paper category: Conference
Book title: 2nd International conference on Microstructural-related Durability of Cementitious Composites
Editor(s): Guang Ye, K. Van Breugel, Wei Sun, Changwen Miao
Print ISBN: 978-2-35158-129-2
e-ISBN: 978-2-35158-123-0
Publisher: RILEM Publications SARL
Pages: 875 - 883
Total Pages: 8
Language: English


Abstract: 
This study aims at generating numerical 3D Representative Volume Elements (RVE) of concrete so as to study the effects of the granular inclusions shape on the macroscopic kinetics of transport phenomena. Two phases are considered in the RVE: a matrix of mortar and inclusions corresponding to the concrete coarse aggregates. The choice of a mesoscopic modeling for the mortar matrix is based on the need to obtain numerical structures of reasonable size. In particular, the Interfacial Transition Zones (ITZs) are ignored, as this hypothesis seems acceptable for large aggregates. This study is applied to simple modeling approaches of reactive transport phenomena: drying, and atmospheric carbonation. The purpose is to quantify the influence of the aggregate shape on the kinetics of macroscopic transfer and the isovalue lines for some physical variables representative of the reactive transport problems: saturation degree and calcite concentrations. Basic aggregates shapes are studied (spheres, cubes), as well as more complex and random geometries (Voronoi particles) which are supposed to be more representative of real aggregates. The effects of ‘nonisotropic’ shapes (oblate and prolate ones) are also investigated.


Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00