A nonlinear meso–macro approach to modelling delayed ettringite formation and concrete degradation

type de publication	article dans une revue internationale avec comité de lecture
date de publication	2014
auteur(s)	Roubin Emmanuel; Shamaa M. Al; Colliat Jean-Baptiste; Pavoine A.; Divet LoIc; Torrenti Jean-Michel; Nahas Georges
journal (abréviation)	Materials and Structures (Materials and Structures)
volume (numéro)	47 (11)
pages	1911 – 1920
résumé	We show how a two-scales FE model—within a sequential approach—leads to consistently simulate the DEF macroscopic consequences: cracks pattern and opening, residual modulus decrease. The mesoscopic part of this model is adapted to heterogeneous materials and is based on two kinematics enrichments. The first one leads to a very fast meshing process along the randomly chosen set of aggregates and, the second leads to directly compute the cracks openings. Assuming DEF is driving to a progressive and homogeneous mortar expansion, we show how the macroscopic—concrete—expansion as well the cracks pattern are consistent with the experiments. For the latter we are interested in the characterization of the aggregates effect on the amplitude of DEF swelling, so that we focus on parameters such as the size and the volume fraction of granular inclusions.
mots clés	Concrete, Delayed ettringite formation, Internal sulfate reaction, Enhanced finite element method, Heterogeneous material modeling
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