InnoRenew CoE International Conference 2021
ONLINE | 10-11 JUNE 2021
BOOK OF ABSTRACTS
INNORENEW COE INTERNATIONAL CONFERENCE 2021 2
innorenew coe Livade 6, 6310 Izola, Slovenia iric2021 scientific committee
Andreja Kutnar Anna Sandak David DeVallance
Iztok Šušteršič Jakub Sandak Michael Burnard
Miklós Krész editors/designers
Amy Simmons Elizabeth Dickinson
innorenew.eu
InnoRenew CoE is funded by the European Commission under Horizon 2020, the EU Framework Programme for Research and
Innovation (H2020 WIDESPREAD-2-Teaming #739574), and by investment funding from the Republic of Slovenia and the
European Regional Development Fund.
INNORENEW COE INTERNATIONAL CONFERENCE 2021 38
Creep Behaviour of Densified Wood
Lei Han
1, Andreja Kutnar
2,3, Dick Sandberg
41. InnoRenew CoE, Livade 6, SI-6310 Izola, lei.han7@innorenew.eu
2. InnoRenew CoE, Livade 6, SI-6310 Izola, andreja.kutnar@innorenew.eu
3. University of Primorska, Titov trg 4, SI-6000 Koper, andreja.kutnar@upr.si
4. Luleå University of Technology, Forskargatan 1 SE-931 87 SKELLEFTEÅ, dick.sandberg@ltu.se
Due to the reproducibility, good workability, suitable mechanical properties, and attractive aesthetic appearance, timber is widely used in the building industry. Among those properties, mechanical properties are important for the useability of timber in construction applications. It is well known that there is a positive relationship between wood density and its mechanical properties. That means the thermo-hydro-mechanical (THM) densification, i.e. transverse compression of the wood cells only by using additional temperature, moisture and mechanical action to increase its density without structural fracturing is a practicable method to increase the performance of low-density species and thereby improve its mechanical properties. The previous studies on wood densification mainly focused on the influence of process parameters on wood physical and mechanical properties and how to use post- treatment to reduce the set recovery. This study is in the field of increasing the use of densified timber in construction applications and thereby strengthen the competitiveness of wood as a construction material.
In construction, however, densified timber normally needs to be exposed to long-term loading which may lead to creep deformation and reduction of load-bearing capacity. There is an obvious risk of reduced serviceability and safety of constructions containing densified wood. Studies of creep characteristics of densified wood are rare, and therefore the purpose of this study was to fill the gap in knowledge if the field of densified under bending load. Scots pine specimens subjected to THM densification, THM densification with a post-heat treatment, and THM densification combined with phenol resin impregnation were loaded under 3-point bending under the 35% of maximum stress level at 20℃ and 65% RH. Results from these tests will be presented.
Keywords: heat-treatment, resin impregnation, Scots pine Acknowledgement
The European Commission for funding the InnoRenew project (grant agreement #739574) under the Horizon2020 Widespread-2-Teaming program and the Republic of Slovenia (investment funding from the Republic of Slovenia and the European Regional Development Fund) are greatly acknowledged.
