The incorporation of fine recycled concrete aggregates as a main constituent of cement - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Materials and structures Année : 2021

The incorporation of fine recycled concrete aggregates as a main constituent of cement

André Lecomte
Chahinez Aissaoui
  • Fonction : Auteur
  • PersonId : 1290303
Jean-Michel Mechling

Résumé

Studies on recycling of deconstruction concrete into new concretes show that it is difficult to integrate fine recycled concrete aggregates in new concrete due to the high proportion of cement paste in the fine fraction which is porous and absorbs a lot of water. A way to upgrade this fraction is to use it in ground form as a main constituent of cement. Four types of fine recycled concrete aggregates were ground and added to an ordinary Portland cement type with a substitution rate of “25% wt%” in order to form Portland cement type CEM II/B. The mechanical strengths of the mortars with these composite cements were performed at 2, 7 and 28 days. The study shows that these ground fine aggregates do not act only as fillers but also have a binding property. This is due to their carbonate content which comes either from the natural aggregates used for the manufacture of concrete or from the carbonation of portlandite released during the cement hydration.
Fichier non déposé

Dates et versions

hal-03935248 , version 1 (11-01-2023)

Identifiants

Citer

Cécile Diliberto, André Lecomte, Chahinez Aissaoui, Jean-Michel Mechling, Laurent Izoret. The incorporation of fine recycled concrete aggregates as a main constituent of cement. Materials and structures, 2021, 54 (5), pp.197. ⟨10.1617/s11527-021-01796-6⟩. ⟨hal-03935248⟩
12 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More