Abstract
The feasibility of building with earth in the same and simple way as cement-based concrete has been demonstrated as an environmental-friendly alternative. Sodium alginate, a bio-sourced polymer, is used to induce a liquid–solid transition to a clay based suspension, similar to hydraulic binders. The polymer gelation occurs via calcium ions released from the binding phase through a gentle acidification of the mix. It leads to a substantial solidification of the wet material, theoretically sufficient to remove the formwork of an earth wall within 24 h without waiting for drying. Working time is adjusted using a chelator which forms complexes with calcium ions.
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Acknowledgements
Authors would like to thanks Rhône-Alpes Region for the grant of Alban Pinel doctoral fellowship.
Funding
This study was funded by “Région Rhône Alpes”, France (ARC 2013-0077 13-009672-01).
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Author Alban Pinel has received research grants from “Région Rhône Alpes”. The authors declare that they have no conflict of interest.
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Pinel, A., Jorand, Y., Olagnon, C. et al. Towards poured earth construction mimicking cement solidification: demonstration of feasibility via a biosourced polymer. Mater Struct 50, 224 (2017). https://doi.org/10.1617/s11527-017-1092-9
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DOI: https://doi.org/10.1617/s11527-017-1092-9