Micromechanical contributions to the behaviour of cement-based materials: Two-scale modelling of cement paste and concrete in tension at high temperatures

How to consider the Interfacial Transition Zones in the finite element modelling of concrete?

“…In most of models, calculations overestimate the global permeability of concrete in comparison with experimental measurements. The influence of the microstructure and its evolution are significant [35], so the microstructure has to be better represented in modelling of conductivity by taking into account the ITZs.…”

Modeling of the quasibrittle fracture of concrete at meso-scale: Effect of classes of aggregates on global and local behavior

“…N'Guyen [18] showed numerically if the element size h is less than the third of the minimum diameter (Ø min ), the fracture behavior obtained on the basis of the diffuse mesh technique is similar to the one obtained on the basis of an exact meshing method (see Section 2.2 of [18]). Moreover, Grondin et al [24] showed that the stability of the results according to the random distribution of heterogeneities for an exact meshing method is obtained if the finite element size is equal to 0.8 times the smallest inclusion diameter. An element size of 0.3 mm was chosen in our case:…”

Relevance of a mesoscopic modeling for the coupling between creep and damage in concrete

“…Could the same result be obtained with the mesoscopic modeling? Grondin et al (2007Grondin et al ( , 2011 showed that the random distribution, if it satisfies the size conditions of the representative elementary volume, does not influence the macroscopic behavior law. But they did not study the influence on the cracking process.…”