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The various sites carried out in urban areas, for roads, construction or tunnels, have in common that they make mobile materials of very varied natures - organic or mineral, polluted or not by former anthropic activities - which are called "excavated soils". These soils from building and public works sites acquire the status of waste but can also be a resource by being used as land - a reconstitued flat surface but also organic matter that can be used for agricultural purposes -, as landscaping or even as construction materials. It has been noted that, despite regulations calling for greater recovery at national and European level, building site soils are frequently dumped or used as fill. Beyond the technical conditions to use the soils as materials, the management of soils is determined by construction site practices, the space available for their management, local needs in mineral and organic resources, the structuring of new use chains or the regulatory framework which is itself defined at different scales. The project intends to analyse these different aspects by considering the chain of excavated soils from the work sites to their new use, the practices ensuring their transformation and circulation as well as the texts that govern them in different spatial contexts (Europe in the European Union and outside the EU and Brazil). Mobilising social science methods – including « following the thing » - and crossing geography, planning, environmental law and civil engineering, the research will deploy photographic practice to then propose a restitution of the metabolism of excavated soils in the form of textual and visual narratives and engage in the creation of new scenarios of recovery. The chain approach will then be mobilised and tested in the training of practitioners and student teachers.
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