This paper analyzes the properties of composite particleboards made from a mix of giant reed with gypsum plaster and starch as binders. Experimental boards were manufactured with a 10:2 weight ratio of giant reed/gypsum plaster particles and different amounts of starch. Giant reed particles used were ≤0.25 mm. The mix was pressed at a temperature of 110 °C with a pressure of 2.6 MPa for 1, 2, and 3 h. The results showed that the boards manufactured with longer times in the press and with 10 wt.% starch achieved the best physical and mechanical properties, obtaining a modulus of rupture (MOR) of 17.5 N/mm2, a modulus of elasticity (MOE) of 3196 N/mm2, and an internal bounding strength (IB) of 0.62 N/mm2. Thickness swelling (TS) at 24 h of the panels was reduced from 36.16% to 28.37% when 10 wt.% starch was added. These results showed that giant reed-gypsum-starch particleboards can be manufactured with physical and mechanical properties that comply with European standards for use in building construction.
Keywords: Arundo donax L.; composite; panel; plant residues; valorization; waste.