Abstract
On the eve of changing laws concerning dredging practices, the recovery of sediments is necessary to create a viable economy for their management. With the evolution of the global environmental context which invites companies to reduce their impact by reusing local materials, dredged sediments represent a potential source of material. Thus, the objective of this study is to develop an ecological concrete via the use of geopolymers that can be poured on site for public works close to the Ports. Recent studies showed that the development of a geopolymer phase when mixing sediments with an alkali reagent is viable due to their mineralogical and chemical composition. However, due to the use of sediments in their natural state, high setting times and shrinkage were observed which could prevent their valorisation. Therefore, this study aims to improve the developed mortars through the co-valorisation of marine sediments with Supplementary Cementitious Materials (SCMs) such as metakaolin and ground granulated blast furnace slag. The sediment-based geopolymer mortars has been analysed through macroscopic and mineralogical tests. The durability has been also studied in order to validate the viable use of sediment based geopolymer mortars. The results showed that the use of metakaolin could be beneficial to improve the compressive strength and durability of the mortars compared to ground granulated blast furnace slag where calcium could be detrimental to the reactions kinetics.
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Acknowledgments
This work is carried out within the framework of the ValoSed project financed by the Nouvelle Aquitaine region and the FNTP. Acknowledments to all the partners : New Aquitaine Region, FNTP, Grand Port Maritime de Bordeaux, SIBA, Grand Port Maritime de Bayonne, Grand Port Maritime de la Rochelle, Eiffage, NGE, Spie Batignolles and Solétanche Bachy.
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Monteiro, L., Saliba, J., Yanez-Godoy, H., Saiyouri, N. (2023). Strength and Durability Assessment of Geopolymer Mortars Based on Non-calcined Dredged Sediments. In: Jędrzejewska, A., Kanavaris, F., Azenha, M., Benboudjema, F., Schlicke, D. (eds) International RILEM Conference on Synergising Expertise towards Sustainability and Robustness of Cement-based Materials and Concrete Structures. SynerCrete 2023. RILEM Bookseries, vol 44. Springer, Cham. https://doi.org/10.1007/978-3-031-33187-9_36
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