Valorisation des sédiments marins contaminés par solidification/ stabilisation à base de liants hydrauliques et de fumée de silice

摘要

The reuse of the dredged sediments in road construction has been studied and published in the previous researches which are presented in this rapport. The main objective is to enhance the physical and mechanical characteristics of the mix by incorporating binders (cement and/or pozzolanic binder). The preliminary study performed on fine dredged sediments revealed the identification of the mechanical characteristics measured on the mixes is compatible with their use as a base course material. The result shows that the treatment by hydraulics binders could satisfy the needed mechanical characteristics. However the proportion of hydraulics binders needed to meet prescribed specification is important so the reuse of the dredged sediments of Port en Bessin in road construction as an alternative material could be achieved. The construction of the experimental road has allowed to evaluate the compatibility of this designed material with the current practice with standard materials. To evaluate the environmental impacts of the used material, leaching tests are performed. The leaching tests were performed to verify the predicted release of pollutants based on total dissolution. And for the final part, the fine dredged sediments were used for the construction of the of the platform road in situ.