Study of Composition and Characteristics of Wood-Gypsum Composite

The composition and characteristics of the developed wood-gypsum composite material of the optimal composition were investigated. The wood-gypsum composite material can be used both as a finishing material for interior finishing and as a repair composition. Optimal is the following composition by weight: 45% gypsum grade G16, 16% second grade pine sawdust with a fraction of 5 mm, 39% water The moisture content of the composite material was determined using a gravimetric measurement method based on the extraction of moisture from the material and the calculation of its mass fraction. The moisture content of the wood-gypsum composite material is 26.3 ± 1.2%. The study was conducted on a moisture meter AND ML-50 instrument. The specific surface area was measured by the Brunauer–Emmett–Teller (BET) method using a highly efficient gas absorption analyzer with three micropore analysis stations and four specialized built-in ports for sample preparation (degassing). The specific surface area of the material was 9.9 m2/g. Elemental analysis was also performed, which makes it possible to quantitatively and qualitatively establish the composition of the composite material. Elemental analysis showed that the developed wood-gypsum composite is more than 98% composed of Ca and Sx.