Leaching effect on mechanical properties of cement-aggregate interface

Abstract : This study concerns the characterization of the mechanical properties of the cement paste and of the cement-aggregate interface in the degraded state by a chemical leaching mechanism. This study is carried out within the framework of the MIST laboratory. The experimental tests were carried out on cement paste and composites consisting of aggregates bound by the same cement paste prepared with a water/cement ratio of 0.5. The particular experimental devices, designed and produced for the purposes of this study, made it possible to directy solicit the composites at the cement-aggregate interface. As the process of leaching with the deionized water occurs very slowly, the experimental study is accelerated in the laboratory by replacing water by ammonium nitrate solution. To quantify the development and ki-netics of chemical degradation at the cemented bond, the concrete leaching fronts are characterized at different times of degradation by using phenolphthalein. The local mechanical tests (tensile and shear) are performed on cement paste and composite at different degradation rate. The experimental results show a fast drop in shear or tensile strength of about 45% at the beginning of degradation. These results confirm the effect of the cement paste-aggregate interface degradation on the mechanical properties.
Type de document :
Article dans une revue
Cement and Concrete Composites, Elsevier, 2018, 87, pp.10 - 19. 〈10.1016/j.cemconcomp.2017.11.018〉
Liste complète des métadonnées

Littérature citée [22 références]  Voir  Masquer  Télécharger

https://hal.archives-ouvertes.fr/hal-01772568
Contributeur : François Gibier <>
Soumis le : vendredi 20 avril 2018 - 13:50:11
Dernière modification le : jeudi 25 octobre 2018 - 14:36:01
Document(s) archivé(s) le : mardi 18 septembre 2018 - 19:49:22

Fichier

Art_Jamin_al_Cement-Concr.Comp...
Fichiers produits par l'(les) auteur(s)

Identifiants

Collections

Citation

Mouad Jebli, Frédéric Jamin, Céline Pelissou, Etienne Malachanne, Eric Garcia-Diaz, et al.. Leaching effect on mechanical properties of cement-aggregate interface. Cement and Concrete Composites, Elsevier, 2018, 87, pp.10 - 19. 〈10.1016/j.cemconcomp.2017.11.018〉. 〈hal-01772568〉

Partager

Métriques

Consultations de la notice

67

Téléchargements de fichiers

14