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Valorisation d'une craie du Nord de la France en assise de chaussée routière

Abstract : The lack of high quality aggregates in some French regions seems to become a main issue for road work firms. With an annual consumption of 200 millions tonnes of aggregates, road professionals must square up finding new solutions like the valorisation of some forgotten materials. Between rock and soil, chalk has a particular position in road work. While its use is relatively well managed for the realisation of fills and subgrade courses, the same certainly cannot be said for base courses. This kind of material is usually rejected for the design of road base courses because it is not approved within the current standards used by road professionals. Indeed, the low mechanical performances and the high water sensibility of chalk do not allow this material to be used. However, it seems possible to find some pre-treatments to harden chalk for a use in road base courses.This material is found profusely in some French regions otherwise limited in upscale aggregates (Nord-Pas de Calais, Champagne-Ardenne…). Therefore, valorising chalk may overcome the lack of aggregates, contribute to the preservation of natural resources, save up money and avoid pollution due to distant supplying.The study presented here is conducted in partnership between the Ecole Centrale de Lille Civil Engineering Laboratory and the Eurovia Roadworks Laboratory of Loos. We provide several trails aimed at improving the mechanical properties of chalk for its use in road base courses
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Submitted on : Thursday, April 7, 2011 - 11:14:23 AM
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  • HAL Id : tel-00494527, version 2



Jaouad Nadah. Valorisation d'une craie du Nord de la France en assise de chaussée routière. Autre. Ecole Centrale de Lille, 2010. Français. ⟨NNT : 2010ECLI0002⟩. ⟨tel-00494527v2⟩



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