Accéder directement au contenu Accéder directement à la navigation
Communication dans un congrès

A computational linear elastic fracture mechanics-based model for alkali-silica reaction - Nuwcem

Laurent Charpin 1 Alain Ehrlacher 1
1 msa - Matériaux et Structures Architecturés
navier umr 8205 - Laboratoire Navier
Abstract : This article presents a fracture mechanics model for Alkali-Silica Reaction. The model deals with the case of a concrete made up of dense aggregates submitted to chemical attack. The chemistry and diffusion (of ions and gel) are not modelled. The focus is put on the mechanical consequences of the progressive replacement of the outer layer of the aggregate by a less dense gel. A schematic cracking pattern is assumed: a ring-shaped crack appears in the cement paste surrounding the spherical aggregate depending on the pressure build-up. The onset of cracking is determined using an incremental energy criterion. The stored elastic energy and deformation of a given configuration are determined assuming that each aggregate behaves as if it was embedded in an infinite cement paste matrix. The calculations are performed by Finite Element Analysis. We note a very different behaviour of aggregates of different sizes. Adding the contributions of different aggregate sizes leads to an estimation of the global free expansion of a concrete of given aggregate size distribution. A rate of attack is identified that leads to recover the usual sigmoid ASR expansion curve.
Liste complète des métadonnées

Littérature citée [7 références]  Voir  Masquer  Télécharger

https://hal-enpc.archives-ouvertes.fr/hal-00843899
Contributeur : Laurent Charpin <>
Soumis le : vendredi 12 juillet 2013 - 13:06:42
Dernière modification le : vendredi 17 juillet 2020 - 17:09:09
Archivage à long terme le : : dimanche 13 octobre 2013 - 06:00:09

Fichier

Charpin_-_Nuwcem_-_29_08_2011....
Fichiers produits par l'(les) auteur(s)

Identifiants

  • HAL Id : hal-00843899, version 1

Citation

Laurent Charpin, Alain Ehrlacher. A computational linear elastic fracture mechanics-based model for alkali-silica reaction - Nuwcem. Nuwcem, Oct 2011, France. pp.1. ⟨hal-00843899⟩

Partager

Métriques

Consultations de la notice

198

Téléchargements de fichiers

94