Etude ACV des chantiers de démolition en vue de la préservation des ressources : focus sur les procédés de transport et de décharge

Abstract : The preservation of natural ressources is one of the biggest concerns for the years to come. The building sector that fulfills the need of a housing for every human being requires a lot of materials. Indeed, this industry plays a crucial role. Then, it seems relevant to study the building end of life which managing can transform waste into ressources. Thanks to the Life Cycle Assessment, it is possible to evaluate the environmental impacts of demolition sites and also to estimate the potential benefits of a more durable managing. From a traditional demolition where waste separation was not or little done, we are now going to a selective demolition where waste sorting is made and the different waste categories are sent to specific installations (recycling platforms, incinerators or landfills for example). Nowadays, waste recyling is being encouraged particularly for materials where the environmental benefits come with the economic ones like for metals. Our work considered the reuse of structural elements in reinforced concrete instead of their recycling. It allows to increase their lifetime while decreasing the need in mineral ressources. The environmental relevance of this solution was studied. The second contribution deals with the data adaptation needed in LCA. During the various LCA studies done in this work, the Ecoinvent database was used. However, the provided data was often too aggregated and consisted in average data which reduces the relevance of using it in specific cases. A deep analysis of the truck transportation and the landfill processes was made as well as the adaptation needed to be coherent with the specific case of demolition sites located in France. In the case of the transport process, the empty returns were more specifically taken into account. For the landfill process, one has to deal with the differences between the french and the swiss infrastructures used as the reference ones. Thus, this data adaptation could be extended to other transport and landfill processes but also to other Ecoinvent processes in order to reinforce the reliability of LCA studies
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Raphaël Briere. Etude ACV des chantiers de démolition en vue de la préservation des ressources : focus sur les procédés de transport et de décharge. Matériaux composites et construction. Université Paris-Est, 2016. Français. ⟨NNT : 2016PESC1003⟩. ⟨tel-01397821⟩

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