Development of a permeable removable urban pavement for a higher sustainability
Résumé
In 2008, Eiffel University proposed an original concept of removable urban pavement (RUP) whose purpose is to ensure an easy and fast access to the sub-base and to the networks underneath, for maintenance or extension needs. The concept is based on interlocked precast hexagonal concrete slabs. A first prototype confirmed the proof of concept. Based on this experience, Eiffel University, in collaboration with Eiffage Infrastructures and Alkern companies, has been developing since 2017 a new type of permabled RUP as this property is becoming more and more pregnant in a context of climate change and violent climatic events. The slabs are made of a porous concrete layer cast fresh on fresh on a self compacting concrete including 40% of recycled concrete coarse aggregates. The slabs are laid on an original excavatable and draining cement treated base. Because RUP simplifies the maintenance operations on the networks underneath and can be easily recycled, it is expected to give a good overall balance of CO2 during it life time. The present paper first describes the concept of permeable RUP, the laboratory design process and its evaluation under the fatigue carousel. It concludes by the construction and the follow up during 2 years of a 200 m2 demonstrator constructed in Nantes Metropole in 2022 and submitted to real traffic.
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