Microstructure and poro-mechanical performance of Haubourdin chalk

Jaouad, Nadah; Bignonnet, F.; Davy, Catherine; Skoczylas, Frédéric; Troadec, David; Bakowski, S.

Document type :

Article dans une revue scientifique: Article original

DOI :

10.1016/j.ijrmms.2012.11.001

Title :

Microstructure and poro-mechanical performance of Haubourdin chalk

Author(s) :

Jaouad, Nadah [Auteur]
Laboratoire de Mécanique de Lille - FRE 3723 [LML]
Bignonnet, F. [Auteur]
Modélisation et expérimentation multi-échelle pour les solides hétérogènes [multi-échelle]
Davy, Catherine [Auteur]

Laboratoire de Mécanique de Lille - FRE 3723 [LML]
Skoczylas, Frédéric [Auteur]
Laboratoire de Mécanique de Lille - FRE 3723 [LML]
Troadec, David [Auteur]

Centrale de Micro Nano Fabrication - IEMN [CMNF - IEMN]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Bakowski, S. [Auteur]
EUROVIA

Journal title :

International Journal of Rock Mechanics and Mining Sciences

Pages :

149-165

Publisher :

Pergamon and Elsevier

Publication date :

2013-02-01

ISSN :

1365-1609

English keyword(s) :

Chalk
Microstructure
Mechanical performance
Poro-mechanics
Water saturation
Heat treatment

HAL domain(s) :

Sciences de l'ingénieur [physics]/Génie civil

English abstract : [en]

Large chalk deposits are to be found in the North of France, and, as a result, developing chalk as a load-bearing aggregate is considered by French road building companies. Due to its limited mechanical performance, chalk ...
Show more >Large chalk deposits are to be found in the North of France, and, as a result, developing chalk as a load-bearing aggregate is considered by French road building companies. Due to its limited mechanical performance, chalk is subjected to a medium heat treatment process (up to 500 °C). In this context, microstructure and poro-mechanical performance of Haubourdin chalk are characterized before and after heat treatment. The investigation of the so-called water weakening effect is associated to that of heat-treatment, mainly to show to what extent the strength of Haubourdin chalk decreases at a given water saturation state, prior to or after heat-treatment. In terms of microstructure analysis, SEM and FIB/SEM observations show the initial weak cementation of Haubourdin chalk, in direct relation with its moderate mechanical performance. After heat treatment, minor re-crystallisation of calcium carbonate is observed, which should be confirmed further. The specific behavior of Haubourdin chalk is highlighted under partial water saturation and after heat treatment, by using uniaxial compressive tests, and triaxial drained and undrained compressive tests. Pore collapse is quantified directly under increasing hydrostatic stress by measuring coupled gas permeability and porosity change. A heat-hardening effect is identified, which is counter-balanced by the water-weakening effect. The latter makes natural Haubourdin chalk unsuitable as load-bearing road aggregate, without further binding matter.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

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