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Identification et caractérisation de la cohésion interne du matériau terre dans ses conditions naturelles de conservation

Abstract : The successful conservation of our earthen cultural heritage is a complex problem which has many different aspects. The most straightforward is probably the preservation of the cohesion of this material. However, the knowledge of earth material for earth building is quite empiric. Considering the hierarchical structure of most earthen materials, with several different length scales, and the variety of conditions to which they are exposed, it is unlikely that a simple answer can be given to the question: what is cohesion? To answer this question, a model material has been made by mixing sand of Hostun and kaolinite for different mass% of clay minerals (5, 10, 15 and 25 mass%). Two principal approaches were used to study this material: soils mechanics tests adapted to unsatured materials (simple shear, unconfined compressive test and triaxial test) and image analysis on thin sections or global samples by SEM (2D - false 3D) and tomography (3D). These multi-scale approaches showed a maximum of Mohr-Coulomb cohesion, a best distribution of critalographic phases for 15 mass% of kaolinite. The Mohr-Coulomb cohesion is the sum of different forces that can not be measured independantly. The last approach is a semi-quantitative model which estimates this cohesion by a detailled description of all forces (mechanical, capillary and Van der Waals forces).
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https://tel.archives-ouvertes.fr/tel-00008287
Contributor : David Gelard <>
Submitted on : Friday, January 28, 2005 - 10:04:47 AM
Last modification on : Friday, November 6, 2020 - 4:36:40 AM
Long-term archiving on: : Friday, April 2, 2010 - 9:00:23 PM

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  • HAL Id : tel-00008287, version 1

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David Gelard. Identification et caractérisation de la cohésion interne du matériau terre dans ses conditions naturelles de conservation. Matériaux. Institut National Polytechnique de Grenoble - INPG, 2005. Français. ⟨tel-00008287⟩

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