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Caractérisation expérimentale du traitement à la chaux d'un mélange sable-bentonite [Experimental characterization of the lime treatment of sand-bentonite mixture]

This research focuses on the influence of the lime-treatment on sand-bentonite mixtures. In reality, the variety of natural soils and the disruptive elements do not allow comparing these soils to each other and giving any quantitative conclusions in terms of mechanical improvement. The goal of this study is to build a progressive comprehension of this phenomenon by avoiding any disruptive elements and controlling the most part of the parameters. Consequently, it is considered to study a synthetic soil by controlling its particle size and composition. As a first step, relatively conventional experimental tests in soil mechanics are performed: uniaxial compression tests and indirect traction tests.Actually, sand takes an important part into soil stabilization meaning that a soil containing a lot of clay does not necessary give the best mechanical characteristics.More specific experiments are carried out in order to characterized the physico-chemical reactions of the lime with soil at the particle scale: X-Ray Computed Tomography images (Figure 2), Leroux tests (to determine the amount of aluminate and sulfate created during the reaction), X-Ray diffraction, ... [This research focuses on the influence of the lime-treatment on sand-bentonite mixtures. In reality, the variety of natural soils and the disruptive elements do not allow comparing these soils to each other and giving any quantitative conclusions in terms of mechanical improvement. The goal of this study is to build a progressive comprehension of this phenomenon by avoiding any disruptive elements and controlling the most part of the parameters. Consequently, it is considered to study a synthetic soil by controlling its particle size and composition. As a first step, relatively conventional experimental tests in soil mechanics are performed: uniaxial compression tests and indirect traction tests.Actually, sand takes an important part into soil stabilization meaning that a soil containing a lot of clay does not necessary give the best mechanical characteristics.More specific experiments are carried out in order to characterized the physico-chemical reactions of the lime with soil at the particle scale: X-Ray Computed Tomography images (Figure 2), Leroux tests (to determine the amount of aluminate and sulfate created during the reaction), X-Ray diffraction, ...]



responsable


Bertrand FRANÇOIS


équipe


Mir Amid HASHEMI AFRAPOLI


disciplines et mots clés déclarés


Construction sous-oeuvre

lime treatment soil stabilization