| taille du texte : S-M-L |
| impression | intranet

Coupled transport and poro-mechanical properties of a heat-treated mortar under confinement

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2013
auteur(s) Chen Xiaoting; Caratini Gregory; Davy Catherine A.; Troadec David; Skoczylas Frédéric
journal (abréviation) Cement and Concrete Research (Cem Concr Res)
volume (numéro) 49
pages 10 – 20
résumé This experimental investigation focuses on a mortar heated/cooled up to 105, 200, 300 or 400°C. The reference state for the material corresponds to mass stabilization at 60$^{o}$C oven-drying. Extensive (and tortuous) micro-crack development is shown by SEM and FIB/SEM imaging after heating-cooling up to 400°C. Poro-mechanical performance is significantly affected after 400°C heat-treatment, as plastic straining develops with increasing hydrostatic stress P_c; simultaneously, intrinsic gas permeability K_{int} decreases irreversibly after a first loading, and remains significantly lower whatever the subsequent P_c loading. These results are mainly attributed to the irreversible closure of heat-induced micro-cracks. This interpretation, based on our micro structural analysis, is validated experimentally under hydrostatic loading: a dedicated static gas experiment provides directly the pore volume under given P_c. By comparison with experimental data on heat-treated cement paste, we conclude that the irreversible pore closure of heat-treated mortar is related to that of micro-cracks mainly located at the paste/aggregate interface.
mots clés Heat treatment; Poro-mechanics; Gas permeability; Hydrostatic stress; Connected porosity
lien lien  
Exporter la citation au format CSV (pour Excel) ou BiBTeX (pour LaTeX).