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Dans la perspective de valorisation des sediments marins dans des applications geotechniques routieres, la presente etude concerne l’amelioration des proprietes physico-mecaniques des sediments traites aux liants hydrauliques par ajout de correcteurs granulometriques. Deux sables de caracteristiques physiques differentes, concasse et roule, ont ete incorpores a un sediment fin non contamine lors de son traitement au ciment. Les resultats de caracterisation mecanique montrent une amelioration de la resistance a la compression simple d’un facteur de plus de 40% apres utilisation du sable concasse et 28 jours de cure normale. Aucune difference notable n’a ete observee sur la resistance a la compression diametrale entre les deux sables. Les analyses granulometriques et microstructurales au microscope electronique a balayage montrent une evolution continue de la microstructure dans le temps et permettent de mieux comprendre l’agencement des differents constituants de la nouvelle matrice. Translated version: Influence of granulometric corrector on the properties of the sediments treated with hydraulic binders In this experimental study, beneficial use of dredging sediments is considered using sands to modify particle size distribution. Two different sands, crushed and smooth, were added to the fine non-contaminated sediment before cement-based treatment. Results show that after 28 days in normal cure, unconfined compressive strength was improved up to 40% after adding crushed sand. No significant difference was noted between the two sands relating to tensile strength. Scanning electronic microscopy and grain size analysis show a development in the microstructure of the treated sediment and allow better understanding of the layout of the new matrix. Keywords: Dredging sediment; Hydraulic binder; Particle size distribution corrector; Mechanical behavior; Microstructure.

Influence de l’ajout d’un correcteur granulométrique sur les propriétés des sédiments traités aux liants hydrauliques