Gry Alfredsen
Seniorforsker
Forfattere
Morten Rese Gijs van Erven Romy J. Veersma Gry Alfredsen Vincent Eijsink Mirjam A. Kabel Tina Rise TuvengSammendrag
Det er ikke registrert sammendrag
Forfattere
Injeong Kim Lone Ross Gry Alfredsen Olov Karlsson Elif Kaynak Oisik Das Dennis Jones George I. Mantanis Dick SandbergSammendrag
Scots pine (Pinus sylvestris L.) sapwood was modified using maleic anhydride (MA) and sodium hypophosphite (SHP) to improve its durability against wood-deteriorating fungi, mechanical strength, and fire retardancy (thermal stability). The modification significantly reduced mass loss caused by wood-decaying fungi (Trametes versicolor, Rhodonia placenta, and soft rot fungi) due to the formation of cross-links between wood, MA, and SHP, which limited the moisture uptake and altered the chemical structure of wood. On the other hand, the modification did not provide improved resistance to fungi growth on the wood surface, which indicated that the modification had little impact on the accessibility of nutrients on the surface. A bending test showed that the modulus of elasticity (MOE) was not affected by the treatment, whilst the modulus of rupture (MOR) decreased to half the value of untreated wood. Thermal resistance was improved, as demonstrated by micro-scale combustion calorimeter testing, where the total heat release was halved, and the residue percentage nearly doubled. These results indicate that phosphonate protects the modified wood via the formation of a protective char layer on the surface and the formation of radical moieties. Based on the results, wood modified with MA and SHP shows potential for possible use in outdoor, non-loadbearing structures.
Forfattere
Geir Wæhler Gustavsen Philip Bester van Niekerk Jonas Niklewski Christian Brischke Gry AlfredsenSammendrag
Det er ikke registrert sammendrag
Divisjon for skog og utmark
Deterioration and decay of wooden cultural heritage in Arctic and Alpine environments (ArcticAlpineDecay)
Divisjon for skog og utmark
Forringelse og nedbrytning av kulturminner i tre i arktiske og alpine miljøer (ArcticAlpineDecay)
Divisjon for skog og utmark
WoodStock
EU-prosjektet WoodStock utvikler klimavennlige løsninger for å øke bruken av underutnyttet trevirke i den europeiske byggesektoren.