Influence of materials composition and transportation tours on life cycle assessment of recycled aggregate concrete
Résumé
In a context of incitation to the waste recovery as recycled aggregates to be re-introduced into new concrete, this paper aims to compare the environmental impacts related to the composition of concrete to ones due to the transportation of the recycled aggregates, issued from demolition wastes, by implementing a life cycle assessment (LCA). This study is linked to the RECYBETON French Research Project involving public research laboratories, institutes and private companies. Life cycle assessment (LCA) of recycled aggregates concrete (RAC) in comparison with a natural aggregates concrete (NAC) are realized. The study focuses first on the influence of the composition parameters of the concrete, in particular the content of recycled aggregates, the cement dosage and type, and the water content. The use of recycled aggregates in concrete formulations increases environmental impacts at different levels. This result is due to the increase of the cement content in the samples, because a standardized mechanical strength is required. Then, optimized formulations of concrete with close mechanical strengths are performed in order to obtain the same cement content (CEM 1) and the same efficient water. Four substitution rates are tested: 0, 10%, 30% and 100%. Moreover, in order to take into account impact distance, several transport distances of natural and recycled aggregates are proposed, it allows to study the integrated management of demolition waste streams in several areas.
Domaines
Autre
Origine : Fichiers produits par l'(les) auteur(s)
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