Abstract
The 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. Dans le cadre du projet de restauration du caractère maritime du Mont-Saint-Michel s’est posée la question du devenir de la quantité des sédiments résultant de l’aménagement prévu. Les stabiliser et les réutiliser en tant que matériau routier et de voirie constitue une filière intéressante. Une nouvelle approche utilisant des liants poussolaniques et l’alcali activation, est proposée. Des essais de durabilité ont été menés sur des éprouvettes préparées pour différents taux de liants pouzzolaniques mélangés au sédiment. Un groupe d’éprouvettes a fait l’objet d’un traitement de surface à base d’un produit industriel de durcissement. L’analyse comportementale porte sur la comparaison des propriétés mécaniques et de durabilité notamment pour les sédiments stabilisés et traités en surface.
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