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Theses

Elaboration d'un matériau composite à matrice gypse et renfort bois fragmenté. Amélioration de la résistance au vissage de produits préfabriqués en gypse

Abstract : This PhD thesis studies different problems occurring whenever the association of wood fibres and gypsum is considered in the aim to correcting several flaws of gypsum manufactured Products, nowadays widely in use for indoor walls. At first, some reference data were gathered concerning both wood species that were chosen (poplar and pine): chemical analysis of the wood aqueous extracts, hygroscopic properties, shape factor measurement of fibres obtained by three different fragmenting processes, measurement of the interracial shear stress with gypsum, taking into consideration a stabilising thermal treatment of wood, called retification.

Wood extracts were shown to have a weak influence on the plaster hydration kinetics, through slight delays, without any modification of the gypsum mechanical properties. No link could be shown with the nature of the extractives.

Fibre shape was shown to be crucial for the composite mechanical properties; poplar fibres, obtained by wood defibrating, allowed to obtain performances noticeably superior to those of simple gypsum. Retification shows a negative influence, with a drop in fracture resistance properties with respect to natural fibres.

Retification-stabilised wood fibre, on the contrary, led to the stabilisation of the composite, with materials sometimes more stable than gypsum itself. Other tests on samples more representative of the final product also show a noticeable enhancement of the material properties.
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https://tel.archives-ouvertes.fr/tel-00153160
Contributor : Andrée-Aimée Toucas <>
Submitted on : Friday, June 8, 2007 - 2:19:36 PM
Last modification on : Wednesday, June 24, 2020 - 4:18:31 PM
Long-term archiving on: : Thursday, April 8, 2010 - 7:19:41 PM

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  • HAL Id : tel-00153160, version 1

Citation

Pascal Boustingorry. Elaboration d'un matériau composite à matrice gypse et renfort bois fragmenté. Amélioration de la résistance au vissage de produits préfabriqués en gypse. Génie des procédés. Ecole Nationale Supérieure des Mines de Saint-Etienne, 2002. Français. ⟨tel-00153160⟩

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