| Titre : | Chemo–mechanical modeling for prediction of alkali silica reaction (ASR) expansion (2009) |
| Auteurs : | Stéphane Multon, Auteur ; Alain Sellier, Auteur ; Martin Cyr, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Cement and concrete research (Vol. 39 N° 6, Juin 2009) |
| Article en page(s) : | pp. Martin Cyr |
| Note générale : | Génie Civil |
| Langues : | Anglais |
| Tags : | Alkali-silica reaction (ASR) ; Particle size ; Alkali content ; Expansion ; Model |
| Résumé : | The effect of the size of the aggregate on ASR expansion has already been well illustrated. This paper presents a microscopic model to analyze the development of ASR expansion of mortars containing reactive aggregate of different sizes. The attack of the reactive silica by alkali was determined through the mass balance equation, which controls the diffusion mechanism in the aggregate and the fixation of the alkali in the ASR gels. The mechanical part of the model is based on the damage theory in order to assess the decrease of stiffness of the mortar due to cracking caused by ASR and to calculate the expansion of a Representative Elementary Volume (REV) of concrete. Parameters of the model were estimated by curve fitting the expansions of four experimental mortars. The paper shows that the decrease of expansion with the size of the aggregate and the increase of the expansion with the alkali content are reproduced by the model, which is able to predict the expansions of six other mortars containing two sizes of reactive aggregate and cast with two alkali contents. |
| ISSN : | 0008-8846 |
| En ligne : | http://www.sciencedirect.com/science/article/pii/S0008884609000702 |
