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VALORISATION DES SEDIMENTS FLUVIAUX POLLUES APRES INERTAGE DANS LA BRIQUE CUITE

Abstract : The accumulation of sediments at the bottom of rivers and channels leads to their silting-up. An important part of these sediments is actually polluted therefore; their management has become an environmental and economical concern. Treatment processes permit a reduction in toxicity and volume of dredged material. Thus, raw sediments were subjected to a preliminary treatment using the Novosol® process developed by the Solvay Company and composed of two phases: phosphatation and calcination. The objective of this study is to demonstrate the practical use of treated river sediments into brick production. Treated sediment (TS) is an odourless fine grained powder of a density of 2,66 g.cm-3 (comparable to quartz). It is composed mainly of quartz with a marked presence of calcite and hematite. The granules making up the bulk material are composed mainly of agglomerates of fine sintered particles. The laboratory experimental study has shown the practical use of TS in brick-making as a partial sand and clay substitute. The results of qualification tests (compressive strength, freeze and thaw resistance, water absorption) have shown that the substitution ratio has had an important impact on the quality of the brick. Two factory experiments were carried out to confirm the full-scale practical use of TS as a brick raw material. They showed that TS can be used with substitution rates up to 28% without any alteration of the manufacturing process. Bricks produced with 28% of TS showed a higher compressive strength than the standard ones. Finally, it was also shown that particle size and mineralogy of TS are important factors which influence the quality of bricks.
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Submitted on : Monday, July 2, 2012 - 1:09:57 PM
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  • HAL Id : tel-00713676, version 1

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Mazen Samara. VALORISATION DES SEDIMENTS FLUVIAUX POLLUES APRES INERTAGE DANS LA BRIQUE CUITE. Matériaux. Ecole Centrale de Lille, 2007. Français. ⟨NNT : 2007ECLI0019⟩. ⟨tel-00713676⟩

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