Recovered wood is frequently contaminated with biocides and therefore its use is limited. Even more, wood, impregnated with classical chromated copper arsenate (CCA) preservatives is classified as a hazardous waste, therefore solutions for reuse or recovery of this material are sought. One of the options, discussed in this paper is liquefaction and further applications of liquefied wood containing biocide remainings. In order to elucidate this possibilty, spruce and beech wood was impregnated with liquefied CCB treated and untreaded spruce wood of various concentrations and exposed to wood decay fungi according to the EN 113 procedure. In paralel, the leaching experiments (ENV 1250-2) were performed as well. The results do not clearly show that liquefied wood is bio-inactive. In most cases the mass loss by fungal attack is decreased compared to the untreated controls. On the other hand, copper leaching from spruce wood, impregnated with the liquefied CCB treated wood was significantly reduced. Thus, there are indications that the liquefied wood could be utilized as a binding agent for inorganic biocides.
COBISS.SI-ID: 1957257
Reducing boron leaching from impregnated wood has been one of the most challenging tasks for at least 50 years. In order to slow down the leaching of boron, aqueous solutions of boric acid were combined with liquefied spruce wood. The results clearly showed that leaching of boron from spruce wood impregnated with preservative solutions based on boric acid and liquefied wood was significantly reduced. *The article was published in 2012, but it was prepared on the basis of the reasearch results in 2011, when it had been sent to the journal and accepted.
COBISS.SI-ID: 1881993 (l
The aim of the study was to examine the feasibility of using liquefied wood as an adhesive for bonding wood with high frequency technology. Solid beech wood lamellas were used as a substrate and liquefied wood from poplar as an adhesive. The shear strength and the short term durability of the adhesive bond were determined. It was found out that relatively high immediate shear strength was achieved in the case of the highfrequency bonding of wood with an adhesive made of liquefied wood. However, this property decreased rapidly. Immersion of the specimens in water resulted in a substantial reduction of the bond shear strength. The inclusion of a synthetic resin into the adhesive on the basis of liquefied wood improved the bond shear strength and its durability. The results showed the potentials for using liquefied wood for novel adhesives.
COBISS.SI-ID: 1989257