The Mont-Saint-Michel Project has been carried out to restore the maritime characteristics to those that existed before 1995. Attempts have been made to use marine sediments that are produced as construction waste every year for purposes such as the construction of pavements and driveways; however, it is difficult to directly use the sediments for these purposes. Hence, methods to stabilize marine sediments have recently been developed. The purpose of this paper is to propose a new approach to sediments stabilization; in this approach, pozzolan and alkali-activated binders, are used. The freeze-thaw test and wet-dry test are conducted to determine the durability of the sediments and examine their suitability for use as construction material. The binders are prepared by alkali activation using pozzolan, and different amounts of the binders are mixed with marine sediments named "la tangue". The surfaces of one group of sediments are treated by a substance containing liquid glass. We compare the durability properties and deformation behaviors of two different types of specimens, by conducting tests and taking into consideration climatic conditions around northern France. The sediments stabilized by surface treatment showed high durability properties. The possibility of using them as construction sediments is discussed.

International audienceThe Mont-Saint-Michel Project has been carried out to restore the maritime characteristics that existed before 1995. Attempts have been made to use marine sediments e.g. in the construction of pavements and driveways. Hence, methods to stabilise marine sediments have recently been developed. A new approach to sediment stabilisation is here proposed by using pozzolan and alkali-activated binders. Freeze-thaw and wet-dry tests are conducted to determine the durability of the sediments and to examine their suitability for use as construction material. The binders are prepared by alkali activation using pozzolan, and different amounts of the binders are mixed with marine sediment. The surfaces of one group of sediments are treated by a substance containing liquid glass. We compare the durability properties and deformation behaviours of two different types of specimen, by conducting tests and taking into consideration climatic conditions. The sediments stabilised by surface treatment showed high durability properties

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L'étude porte sur des sédiments provenant de la mer Manche et plus précisément des ports de Dieppe, de Fécamp et du Havre. Les trois sédiments ont été mélangés pour ne faire qu'un seul matériau à valoriser. Plusieurs formulations à base de liants pouzzolaniques ont été testées. Des essais mécaniques de résistance à la compression simple ont été effectués pour en situer les performances. Par ailleurs, chacune des formulations doit aussi respecter à la fois des critères économiques et écologiques. Une fois validées, ces formulations permettent d'aboutir à la stabilisation renforcée des sols de surface pour la réalisation de voies vertes, de vélo-routes ou d'allées naturelles. Ces liants, développés à partir de la combustion de sous-produits industriels, sont à la base de plusieurs procédés, comme les procédés ECOVOIE ® et ACTiV.SOL ® , permettant l'utilisation des sédiments comme matériaux nobles.