Low‐density insulation blocks and hardboards from amaranth (Amaranthus cruentus) stems, a new perspective for building applications
Résumé
Nowadays, amaranth appears as a promising source of squalene of vegetable origin. Am‐aranth oil is indeed one of the most concentrated vegetable oils in squalene, i.e., up to 6% (w/w). This triterpene is highly appreciated in cosmetology, especially for the formulation of moisturizing creams. It is almost exclusively extracted from the liver of sharks, causing their overfishing. Thus, providing a squalene of renewable origin is a major challenge for the cosmetic industry. The ama‐ranth plant has thus experienced renewed interest in recent years. In addition to the seeds, a stem is also produced during cultivation. Representing up to 80% (w/w) of the plant aerial part, it is composed of a ligneous fraction, the bark, on its periphery, and a pith in its middle. In this study, a fractionation process was developed to separate bark and pith. These two fractions were then used to produce renewable materials for building applications. On the one hand, the bark was used to produce hardboards, with the deoiled seeds acting as natural binder. Such boards are a viable al‐ternative to commercial wood‐based panels. On the other hand, the pith was transformed into co‐hesive and machinable low‐density insulation blocks revealing a low thermal conductivity value.
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