Caractérisation d'atterrissements d'argiles récents sur le territoire français, en vue de leur valorisation dans l'industrie des matériaux de construction en terre cuite

Abstract : Preservation of natural resources becomes an important issue in our societies. Raw materials of the fired-clay industry are considered as non-renewable because there are extracted from fossil geologic formations. In this context, current fine-grained deposits of fluvial and coastal systems constitute alternatives to the quarrying of geologic formations. The aim of this thesis is firstly to assess, within France, the renewal of the resource for such materials; and secondly, to seek alternative methods to enhance the use of such sediments to reduce the yearly volume of fossil sediments consumed by fired-clay industry.A first evaluation allowed highlighting that the renewal of the source of fine sediments is provided by the fluvial and coastal deposits with more than 20 Mm3/yr especially in relation to hydraulic management.Development of a Mineralogical Reference Framework (MRF) from industrial mixtures allowed the evaluation of sites taking into account the sediment composition. This MRF constitutes a rapid screening of a site compared to the classic method that necessitates several experiments. This is to be applied to sites which potential has been validated by the MRF.Only a part of the source, about 5 Mm3, can be used by the fired-clay industry which consumes 3,5 Mm3/yr. Fine material resource seems to be renewable.Finally, the realization of mixtures with shortening agents or other sediments with complementary properties allows valuing a larger number of fine-grained deposits.
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Frédéric Haurine. Caractérisation d'atterrissements d'argiles récents sur le territoire français, en vue de leur valorisation dans l'industrie des matériaux de construction en terre cuite. Sciences de la Terre. Ecole Nationale Supérieure des Mines de Paris, 2015. Français. ⟨NNT : 2015ENMP0066⟩. ⟨tel-01423865⟩

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