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Le present travail se place dans une demarche de gestion durable des sediments de dragage portuaire en etudiant le comportement de ces materiaux pour les valoriser efficacement dans le secteur de la construction, domaine privilegie par cette etude. Une caracterisation complete des sediments de dragage des ports de Tanger et de Larache a ete realisee a partir d’analyses chimiques, physiques et environnementales. L’etude des proprietes physiques de ces sediments a revele que ces sediments sont generalement des materiaux fins 0/1mm. La caracterisation chimique de ces memes sediments a permis d’evaluer leur potentiel polluant. On a note l’absence de pollution metallique. La premiere filiere de valorisation de type materiau de construction a concerne les mortiers par substitution du sable par des sediments de dragage. Les valeurs des resistances a la compression obtenues ont confirme qu’une substitution partielle du sable par des sediments de dragage des ports de Tanger et de Larache dans les mortiers est satisfaisante pour un dosage de 20%. La valorisation des sediments dans la fabrication des briques constitue la deuxieme voie de valorisation exploree. La faisabilite technologique de briques renfermant des sediments de Larache a ete demontree par des essais preliminaires en briqueterie. Pour ces briques, la composition retenue est de 70% de sediment. Deux filieres de valorisation sont potentiellement envisageables. Ainsi les sediments de dragage portuaire peuvent constituer une source de matieres premieres interessante pour un secteur consommateur de granulats et de materiaux elabores qu’est le secteur de la construction. Translated version: Characterization and valorisation of dredged harbours sediments from Tangier and Larache (Morocco) This work falls under the process of sustainable management of dredged harbour sediments by studying the behaviour of these materials for valorising them effectively in the construction sector, the interesting field in this study. A complete characterization of sediments dredged from the ports of Tangier and Larache was carried out from chemical, physical and environmental analyses. The study of the physical properties of these sediments revealed that these sediments are generally fine material 0/1mm. Chemical characterization of these sediments was used to evaluate potential pollutant. The absence of metal pollution was noted. The first sector of valorisation is the field of building materials which has involved mortars by replacing the sand by dredged sediments. The values of compressive strength obtained have confirmed that a partial substitution of sand by dredged sediments from the ports of Tangier and Larache in mortars is satisfactory for a strength of 20%. The valorisation of sediments in bricks manufacturing is the second track explored. Technological feasibility of bricks containing sediments from the port of Larache was demonstrated by preliminary tests in a brickyard. For these bricks, the composition chosen was 70% of sediment. Two valorisation processes are potentially possible. Therefore, the dredged harbour sediments can constitute a source of interesting raw materials for the sector of construction that consumes aggregates and developed materials. Keywords: Characterization; Valorisation; Sediments; Dredging; Mortar; Bricks; Tangier; Larache; Morocco.

Caractérisation et valorisation des sédiments de dragage des ports de Tanger et Larache (Maroc)