Recyclage et valorisation de sédiments fins de dragage à usage de matériaux routiers

Dredging materials pose problems for harbour and river planners, which are more and more confronted with the environmental recommendations. To face with the important volumes of dredged sludge, then the management of these materials arises in terms of storage, treatment and valorisation. A cement-based solidification of dredged sludge with additives is proposed for sediments of Seine River in road construction in respect with GTR rules. The development of a formulation is detailed and discussed with the obtained mechanical performances. A simple formulation is used for other marine sediments in order to evaluate the influence of the curing conditions taking into account the absence of fine sand as additive and the influence of organic matters. Results are reported in the paper and illustrate clearly the importance of the nature of constituents of sediments.