Publikasjoner
NIBIOs ansatte publiserer flere hundre vitenskapelige artikler og forskningsrapporter hvert år. Her finner du referanser og lenker til publikasjoner og andre forsknings- og formidlingsaktiviteter. Samlingen oppdateres løpende med både nytt og historisk materiale. For mer informasjon om NIBIOs publikasjoner, besøk NIBIOs bibliotek.
2013
Sammendrag
I forrige utgave av SKOG beskrev vi tremodifisering ved bruk av furfurylering. En annen giftfri metode man kan bruke for å forbedre holdbarheten til tre, er acetylering.
Forfattere
Erik LarnøySammendrag
Det finnes flere ulike metoder og prosesser for varmebehandling av trevirke, også kalt termisk modifisering. Trevirket varmes opp til 160° C eller mer og under forhold med redusert oksygentilgang.
Sammendrag
Når man bruker tre utendørs, i jordkontakt eller i innstallasjoner over bakken, vil trykkimpregnert trevirke beskytte mot sopp- og insektangrep og dermed øke trevirkets levetid. Impregnerte treprodukter til bruk som utvendig kledning, terrassedekk og gjerdestolper kan kjøpes i byggevarehandelen. Hva bør du som huseier vite når du kjøper og bruker impregnert tre?
2012
Forfattere
Andreas TreuSammendrag
Impregneringsmidler beskytter mot sopp- og insektangrep og øker trevirkets levetid. Sammensetningen av impregneringsmidlene påvirker produktegenskapene til de ulike treproduktene.
Forfattere
Andreas TreuSammendrag
Det er ikke registrert sammendrag
Sammendrag
For materialer som brukes i konstruksjoner er det viktig at de oppfyller sin funksjon gjennom levetiden til konstruksjonen. Dersom deler eller hele konstruksjonen må skiftes ut tidligere enn planlagt, bidrar dette til økte kostnader og større miljøbelastning. Levetiden til en trekonstruksjon påvirkes av en rekke faktorer, som i større eller mindre grad kan påvirkes.
Sammendrag
The objective of the project Winfur (within WoodWisdomNet) was the industrial application of furfurylated wood in the window market. Because of promising results concerning the wood species European beech, common ash, radiata pine and Southern yellow pine it was decided to evaluate material from these species.The material exhibits promising wood water related behaviour. Coating tests showed the coatability with selected commercial products. Additionally, outdoor weathering tests were performed. It is also possible to produce 3-layer scantlings with common gluing systems like PVAc. The resistance against wood destroying fungi increased in a way that the material is suitable for the window application. Different investigations were performed to test the furfurylated material and the results are satisfying.The last step in the project was the production of prototypes for different investigations. The window companies reported no differences between using furfurylated wood compared to untreated wood within the production of the windows. The tests of full scale window prototypes according to seven test standards, e.g. repeated opening and closing and water tightness against driving rain were performed.The production and standardised testing of full-scale window prototypes indicates that the use of furfurylated wood will not cause any problems with fulfilling the criteria for the Scandinavian P-mark and the German RAL certificate. The overall conclusion is that furfurylated wood material is suitable for the window production.
Sammendrag
Brown-rot fungi such as Postia placenta are common inhabitants of forest ecosystems and brown rot fungi are also largely responsible for the destructive decay of wooden structures. The aim of this study was to compare two commonly used strains of Postia placenta MAD-698-R and FPRL 280. Scots pine sapwood samples were exposed for two and eight weeks to both fungal strains. The following was investigated: mass loss, fungal gDNA content and gene expression.A significant difference was found in mass loss after eight weeks between the P. placenta strains MAD-698-R and FPRL 280. MAD-698-R gave higher mass loss than FPRL 280. However, MAD-698-R seems to have a slightly slower growth rate than FPRL 280, reflected in lower gDNA content after two weeks.After eight weeks of exposure the gDNA content dropped and no significant difference was found between MAD-698-R and FPRL 280. We observed differences in mass loss, colonization-rate and gene expression between the two Postia strains. Results suggest significant differences in the regulation of key lignocellulose degrading enzymes between MAD-698-R and FPRL 280.
Forfattere
Christian Brischke Christian Welzbacher Antje Gellerich Susanne Bollmus Katharina Plaschkies Wolfram Scheiding Gry Alfredsen Joris Van Acker Imke De WindtSammendrag
Die Dauerhaftigkeit von Holz gegenber Basidiomyceten wird in Europa nach CEN/TS 15083-1 (2005) bestimmt. Die bisherigen Erfahrungen mit diesem Standard sind sehr heterogen, und Ergebnisse frherer Ringversuche teilweise nicht oder nur unvollstndig verffentlicht. Insbesondere die Notwendigkeit einer natrlichen Vorbewitterung der Prfkrper, u.a. mit dem Ziel einer Detoxifizierung des Materials, wird kontrovers diskutiert. Fnf europische Forschungseinrichtungen haben sich deshalb zu einem neuen Ringversuch zusammengeschlossen, in dem die Dauerhaftigkeit gegen holzzerstrende Pilze von fnf Holzarten mit und ohne Auswaschbeanspruchung bzw. 6-monatiger natrlicher Vorbewitterung gegen Coniophora puteana und Trametes versicolor geprft wurden. Es ergaben sich Unterschiede in der Dauerhaftigkeitsklassifizierung zwischen den Prfinstituten (bis zu vier Klassen) sowie in Abhngigkeit von der Vorbeanspruchung und den statistischen Auswertungsgren. Die natrliche Vorbewitterung der Prfkrper hatte teilweise eine Angleichung der Dauerhaftigkeitsklassifizierung zwischen den Prfinstituten zur Folge. In allen Fllen wurde eine Homogenisierung der Dauerhaftigkeitseinschtzung durch Vorbewitterung jedoch nicht erreicht. Generelle Aussagen zum Einfluss der Vorbeanspruchung auf die Klassifizierung der Dauerhaftigkeiten lieen sich somit nicht ableiten, weshalb diese weder zwingend zu empfehlen noch abzulehnen ist.
Sammendrag
Wood for outdoor decking has a high market share in the Nordic and Baltic countries among private house owners. Important issues for the consumer are maintenance intervals and aesthetic appearance as well as decay resistance. Knowledge and consumer information about these aspects are required to ensure that wood can compete with alternative decking materials. In this paper an accelerated testing of decking, “stapelbädds metoden”, was evaluated after ten years of exposure at Ås, Norway. The test method covers different hazard situations within use class 3. Different preservatives and wood modification treatments were used in addition to untreated Scots pine (sapwood and heartwood) and larch (heartwood). The samples were treated with two different surface treatments. In addition there was one set without any surface treatment. Fungal discoloration and decay was evaluated. This provided new information about performance both on and above ground for a range of different combinations of preservative/modified systems and surface treatments of wood in decking for outdoor use. Generally, there were no significant differences in performance between the surface treatments, both with regard to surface discolouring fungi and decay fungi. For all surface treatments, the samples with rating 3 (heavy attack) in bottom layer in one or several stacks was: Tanalith M, Tanalith M (c), Gori Pres 10, Scanimp, styren, furfurylation, thermal modification, Ultrawood, larch heartwood, pine heartwood and pine sapwood. For all surface treatments, the samples with mean rating ≤ 2 (evident attack) in top and middle layer in one or several stacks was: ACQ 1900, Wolmanit CX 8, Tanalith E7, Gori SC 100, Royal, Royal with pigment, Scanimp, styrene and larch heartwood