Title :

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

Author(s) :

Chen, Xiao-Ting [Auteur]
Laboratoire de Mécanique de Lille - FRE 3723 [LML]
Caratini, Grégory [Auteur]
Laboratoire Navier [navier umr 8205]
Davy, Catherine [Auteur]
Laboratoire de Mécanique de Lille - FRE 3723 [LML]
Troadec, David [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Skoczylas, Frédéric [Auteur]
Laboratoire de Mécanique de Lille - FRE 3723 [LML]

Journal title :

Cement and Concrete Research

Pages :

10-20

Publisher :

Elsevier

Publication date :

2013

ISSN :

0008-8846

English keyword(s) :

Thermal treatment (A)
Poro-mechanics (C)
Gas permeability (C)
Hydrostatic stress (C)
Connected porosity (B)

English abstract : [en]

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 °C oven-drying. Extensive (and tortuous) micro-crack ...
Show more >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 °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 Pc; simultaneously, intrinsic gas permeability Kint decreases irreversibly after a first loading, and remains significantly lower whatever the subsequent Pc 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 Pc. 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.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Collections :

• Institut d'Électronique, de Microélectronique et de Nanotechnologie (IEMN) - UMR 8520

Source :

Harvested from HAL