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Mechanical Properties of a 3D-Printed Wall Segment Made with an Earthen Mixture
Article

Rice-Husk Shredding as a Means of Increasing the Long-Term Mechanical Properties of Earthen Mixtures for 3D Printing

1
Department of Civil, Environmental and Materials Engineering—DICAM, Alma Mater Studiorum Università di Bologna, Viale del Risorgimento 2, 40136 Bologna, BO, Italy
2
WASP s.r.l., Via Castelletto 104/106, 48024 Massa Lombarda, RA, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Rui Miguel Novais
Materials 2022, 15(3), 743; https://doi.org/10.3390/ma15030743
Received: 21 December 2021 / Revised: 10 January 2022 / Accepted: 17 January 2022 / Published: 19 January 2022
(This article belongs to the Special Issue Advances in Micromechanical Behavior of Materials)
This paper is part of a study on earthen mixtures for the 3D printing of buildings. To meet the ever increasing environmental needs, the focus of the paper is on a particular type of biocomposite for the stabilization of earthen mixtures—the rice-husk–lime biocomposite—and on how to enhance its effect on the long-term mechanical properties of the hardened product. Assuming that the shredding of the vegetable fiber is precisely one of the possible ways to improve the mechanical properties, we compared the results of uniaxial compression tests performed on cubic specimens, made with both shredded and unaltered vegetable fiber, for three curing periods. The results show that the hardened earthen mixture is not a brittle material, in the strict sense, because it exhibits some peculiar behaviors that are anomalous for a brittle material. However, being a “designable” material, its properties can be varied with a certain flexibility in order to become as close as possible to the desired ones. One of the peculiar properties of the hardened earthen mixture deserves further investigation, rather than corrections. This is the vulcanization that occurs (in a completely natural way) over the long term, thanks to the mineralization of the vegetable fiber by the carbonation of the lime. View Full-Text
Keywords: earthen buildings; 3D printing; sustainability; biocomposites; aging; mechanical properties; lime carbonation; vulcanization earthen buildings; 3D printing; sustainability; biocomposites; aging; mechanical properties; lime carbonation; vulcanization
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MDPI and ACS Style

Ferretti, E.; Moretti, M.; Chiusoli, A.; Naldoni, L.; de Fabritiis, F.; Visonà, M. Rice-Husk Shredding as a Means of Increasing the Long-Term Mechanical Properties of Earthen Mixtures for 3D Printing. Materials 2022, 15, 743. https://doi.org/10.3390/ma15030743

AMA Style

Ferretti E, Moretti M, Chiusoli A, Naldoni L, de Fabritiis F, Visonà M. Rice-Husk Shredding as a Means of Increasing the Long-Term Mechanical Properties of Earthen Mixtures for 3D Printing. Materials. 2022; 15(3):743. https://doi.org/10.3390/ma15030743

Chicago/Turabian Style

Ferretti, Elena, Massimo Moretti, Alberto Chiusoli, Lapo Naldoni, Francesco de Fabritiis, and Massimo Visonà. 2022. "Rice-Husk Shredding as a Means of Increasing the Long-Term Mechanical Properties of Earthen Mixtures for 3D Printing" Materials 15, no. 3: 743. https://doi.org/10.3390/ma15030743

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