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Preliminary study of the mechanical and hygrothermal properties of hemp-magnesium phosphate cements

Abstract : The use of bio-based materials in the construction field is of great interest to society and the scientific community because of its highly sustainable character. They are formed by plant fibres and a binder, usually cement, lime or pozzolanic additives. Among the new vegetable fibres used, hemp-based biomaterials have attracted great attention in the recent years due to its excellent thermal and hygroscopic properties. However, they present a very low mechanical performance, which has intensified the search for better alternatives. In this research, the use of magnesium phosphate cement (MPC) as binder with different hemp additions (8%, 12%, 16% and 20% by weight) was evaluated. Thus, a new material made of hemp and MPC (heMPC) was developed. According to the results obtained, the heMPC could be used in floor or pre-cast structural applications since it presented enhanced mechanical (sigma(max) = 0.714 +/- 0.11 MPa with a 20 wt.% of hemp content) and thermal (lambda(D) = 0.103 W . m(-1) . K-1, density = 600 kg . m(-3)) properties with respect other lime-based hemp biomaterials. Furthermore, the material exhibited good hygroscopic properties (water absorption by capillarity). Accordingly, this preliminary study allowed opening a new research line in the use of hemp bio-composites, in which other important properties are currently under investigation. The MPC used as a binder in this study was formulated with a by-product from the MgO industry, which increases the sustainability and recyclability criteria of the material developed. (C) 2015 Elsevier Ltd. All rights reserved.
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R. Valle-Zermeno, Jean-Emmanuel Aubert, Aurélie Laborel-Preneron, J. Formosa, J. M. Chimenos. Preliminary study of the mechanical and hygrothermal properties of hemp-magnesium phosphate cements. Construction and Building Materials, Elsevier, 2016, 105, pp.62--68. ⟨10.1016/j.conbuildmat.2015.12.081⟩. ⟨hal-01849694⟩



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