other one is calcined in the range 550-1000 °C aiming to obtain a pozzolanic reactive material that could be used as supplementary cementitious material in blended Portland cement. After thermal treatments, the products are characterized and compared to ordinary Portland cement (OPC) and to pozzolanic active materials (fly ash from pulverized-coal power plant). Results showed that each sediment is suitable for the only tested reuse option. For the clinker prepared with SEP sediment, the morphology and the mineralogical composition correspond to those of a typical Portland clinker. Concerning calcined STA pozzolanic activity, the optimum thermal treatment was found to be 900 °C using the chemical Frattini test. Similar compressive strength results were obtained with calcined STA and silico-aluminous fly ash.Abstract Fine-grained sediment deposition is a phenomenon that occurs at different extents in all the reservoirs. This particle accumulation has to be properly managed, in accordance with the operational needs and the environment. As an extracted and on-land managed sediment has to be considered as a waste material according to both European and French regulations, sustainable reuse options need to be investigated. One of them could be a beneficial reuse as a raw material in cement industry either as partial substitution in Portland clinker raw mix or as a supplementary cementitious material (SCM) after thermal treatment in order to activate its possible pozzolanic activity. Two dredged materials, labelled SEP and STA, both from French hydroelectric reservoirs, are characterized on physical, chemical and mineralogical aspects. SEP is used as raw material partial replacement for clinker synthesis and the The original version of this article was revised due to a retrospective Open Access order.
Résumé :Electricité de France (EDF) exploite une large part des installations de l'ensemble du parc hydraulique français. A ce titre elle doit gérer le transit sédimentaire sur ses installations sachant qu'une partie des sédiments peut y être retenue. La question de la gestion à terre de ces sédiments est parfois abordée, le manque de retour d'expériences positives sur les voies de valorisation à terre des sédiments fins de dragage marins et fluviaux révèle l'absence de solutions durables. EDF a donc souhaité travailler à l'élaboration d'un outil de pré-orientation à partir d'une proposition de caractérisation en accord avec les spécifications techniques des filières potentielles, à savoir, en cimenterie, en intégration dans le béton, en matériau routier et assimilé, en matériau céramique et en valorisation agronomique. L'outil proposé est original et apporte aujourd'hui à l'exploitant des installations hydrauliques une première détermination des filières qui doivent être étudiées pour une valorisation définitive.
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