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Caractérisation des sédiments fins des retenues hydroélectriques en vue d’une orientation vers des filières de valorisation matière

Abstract : Sediment dredging is needed to ensure good operation of ports, waterways and reservoirs insofar as navigation or energy production is concerned. The analysis of feedback from experiments concerning beneficial uses of fine sediments dredged from marine and river environments, shows that sustainable solutions are very limited or do not exist. Land-based management of hydro-electric dams with sediments requires the integration of all resources existing in a given area. A sustainable approach to management of dredged material requires, inter alia, a change of point of view. Even if their status is that of waste, these materials deserve to be considered as a valuable potential alternative resource, bearing in mind the scarcity of natural mineral material. Therefore, this thesis proposes a global approach, adapted to dam fine sediments, to implement a decision-making tool in order to pre-screen sediments towards re-use channels. A study of five potential industrial sectors for reusing fine dam sediments was conducted, including cement works, concrete admixtures, road building, ceramics, and agriculture. It highlighted input specifications of fine dam sediments, and research on key parameters. An inventory was established for each of these industrial sectors, quoting related research works and applied engineering. These five sectors or channels were implemented and investigated in laboratory conditions using four hydroelectric dam fine sediments, representative of various typologies. First, a mineral, geotechnical and agronomic characterization was conducted, allowing to weigh sediments - industrial sectors or channels, considering input specifications of re-use objectives. Then, re-use tests followed, namely, manufacturing of a clinker, addition of sediments to a mortar, development of road material and manufacturing of a ceramic material, highlighting positive or negative characteristics of fine sediments in relation to various channels studied. A decision tool was implemented for preselecting re-use channels. It was designed from the identification and interpretation of pertinent technical criteria, and from minimal characterization of fine dam sediments. Finally, it is stressed that geographical proximity for possible re-use is of paramount importance.
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Submitted on : Wednesday, November 28, 2018 - 2:32:31 PM
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  • HAL Id : tel-01938082, version 1

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Baptiste Anger. Caractérisation des sédiments fins des retenues hydroélectriques en vue d’une orientation vers des filières de valorisation matière. Géotechnique. Université de Caen Basse-Normandie, 2014. Français. ⟨NNT : 2014CAEN2034⟩. ⟨tel-01938082⟩

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