One-step preparation procedure, mechanical properties and environmental performances of miscanthus-based concrete blocks
2022
Jury, Colin | Girones, Jordi | Vo, Loan T.T. | Di Giuseppe, Erika | Mouille, Grégory | Gineau, Emilie | Arnoult, Stéphanie | Brancourt-Hulmel, Maryse | Lapierre, Catherine | Cézard, Laurent | Navard, Patrick | INOVERTIS Grp | Centre de Mise en Forme des Matériaux (CEMEF) ; Mines Paris - PSL (École nationale supérieure des mines de Paris) ; Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) | Institut Jean-Pierre Bourgin (IJPB) ; AgroParisTech-Université Paris-Saclay-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | Unité Expérimentale Grandes Cultures Innovation Environnement - Picardie (GCIE) ; Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | Transfrontalière BioEcoAgro - UMR 1158 (BioEcoAgro) ; Université d'Artois (UA)-Université de Liège-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-JUNIA (JUNIA) ; Université catholique de Lille (UCL)-Université catholique de Lille (UCL) | This work was supported by the program Investments for the Future (grant ANR-11-BTBR-0006-BFF) managed by the French National Research Agency. | ANR-11-BTBR-0006,BFF,Biomasse pour le futur(2011)
International audience
Afficher plus [+] Moins [-]anglais. Concrete blocks prepared with Portland cement and miscanthus-based aggregates were prepared in order to check if the miscanthus genotype may influence their mechanical properties and to perform an environmental assessment. To produce lightweight, load-bearing concrete blocks using miscanthus stem fragments as aggregates in a single mixing method turned out to be impossible, although trying to optimize the concrete formulation. The results show that genotypes and size of miscanthus fragments controlled the mechanical properties of the final blocks. The lower was the amount of light elements such as leaves and sheath, the better were the mechanical properties of the blocks. When comparing genotypes with the same leaf/stem ratio, it was not possible to see a correlation between the biochemical composition of the stem and the compressive strength of the blocks. A probable explanation is the small variation of biochemical composition between genotypes. Using life cycle analysis tools, miscanthus block were not found to be competitive with conventional alternatives (concrete block and lightweight pumice block) when trying to increase compressive strength above 3 MPa. However, compared to non-load bearing alternatives (light clay brick), blocks integrating miscanthus had a better global environmental performance mainly due to a favorable climate change impact. The present work also points out the risk of decreasing the environmental performances when cultivating the crop on land in competition with food, because of the impacts of indirect consequences of Land Use Change.
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