F¦rfarande f¦r framställning av sammansättningar som innehåller cellulosahaltiga fibrer

摘要

The invention concerns a process for preparing compositions containing cellulose-based materials, according to which process a finely-divided cellulose-based material is mixed with an aggregate. According to the invention, the cellulose-based substance, such as wood or cellulose fibres, is first heated at a temperature of 150 to 300 DEG C before it is mixed with the aggregate. As a result of the heat treatment, the material becomes less hygroscopic, which makes it easier to mix with other substances. Furthermore, the mono- and polysaccharides and extractives contained in wood are partly decomposed and removed during the heat treatment. The wood or cellulose product thus obtained is particularly useful as a filler of concrete, asphalt and plastics, and, e.g., incorporated into a concrete mix, it does not impair the hardening of the mix.