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Effect of a two-stage heat treatment process on the mechanical properties of full construction timber

Michiel J Boonstra, Joris Van Acker UGent and Edo V Kegel (2007) WOOD MATERIAL SCIENCE AND ENGINEERING. 2(3-4). p.138-146
abstract
This study investigated the impact of an industrially used two-stage heat-treatment method on the mechanical properties of full construction timber. Bending tests of full-size Norway spruce posts demonstrated changes due to heat treatment, such as a decrease in the density and bending strength, as well as an increase in the modulus of elasticity (MOE). The variability in bending strength and MOE appeared to be higher for treated posts and as a result the 5% values decreased, especially for the bending strength. The MOE was dependent on density for both treated and untreated posts, but this was not so for the bending strength. There appeared to be a relationship between the bending strength and the MOE, although it was rather weak, especially for treated posts. It was difficult to correlate the occurrence of natural defects in treated Norway spruce posts with an effect on the mechanical properties. Only a combination of several defects, such as large knots, enclosed pith and a deviating slope of grain, appeared to decrease the bending strength and MOE of treated posts, at least more than for untreated posts. The effect of a three year period of outdoor exposure on the strength properties of heat-treated terrace planking was limited. In particular, for the 5% value low strength range, where wood defects strongly determine the mechanical properties of wood, a three-year outdoor exposure did not change the bending strength or MOE of heat-treated wood.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
Heat treatment, mechanical properties, wood modification, Norway spruce
journal title
WOOD MATERIAL SCIENCE AND ENGINEERING
Wood Mater. Sci. Eng.
volume
2
issue
3-4
pages
138 - 146
ISSN
1748-0272
DOI
10.1080/17480270801945439
language
English
UGent publication?
yes
classification
A2
id
852536
handle
http://hdl.handle.net/1854/LU-852536
date created
2010-02-05 10:07:05
date last changed
2010-02-12 15:59:30
@article{852536,
  abstract     = {This study investigated the impact of an industrially used two-stage heat-treatment method on the mechanical properties of full construction timber. Bending tests of full-size Norway spruce posts demonstrated changes due to heat treatment, such as a decrease in the density and bending strength, as well as an increase in the modulus of elasticity (MOE). The variability in bending strength and MOE appeared to be higher for treated posts and as a result the 5\% values decreased, especially for the bending strength. The MOE was dependent on density for both treated and untreated posts, but this was not so for the bending strength. There appeared to be a relationship between the bending strength and the MOE, although it was rather weak, especially for treated posts. It was difficult to correlate the occurrence of natural defects in treated Norway spruce posts with an effect on the mechanical properties. Only a combination of several defects, such as large knots, enclosed pith and a deviating slope of grain, appeared to decrease the bending strength and MOE of treated posts, at least more than for untreated posts. The effect of a three year period of outdoor exposure on the strength properties of heat-treated terrace planking was limited. In particular, for the 5\% value low strength range, where wood defects strongly determine the mechanical properties of wood, a three-year outdoor exposure did not change the bending strength or MOE of heat-treated wood.},
  author       = {Boonstra, Michiel J and Van Acker, Joris and Kegel, Edo V},
  issn         = {1748-0272},
  journal      = {WOOD MATERIAL SCIENCE AND ENGINEERING},
  keyword      = {Heat treatment,mechanical properties,wood modification,Norway spruce},
  language     = {eng},
  number       = {3-4},
  pages        = {138--146},
  title        = {Effect of a two-stage heat treatment process on the mechanical properties of full construction timber},
  url          = {http://dx.doi.org/10.1080/17480270801945439},
  volume       = {2},
  year         = {2007},
}

Chicago
Boonstra, Michiel J, Joris Van Acker, and Edo V Kegel. 2007. “Effect of a Two-stage Heat Treatment Process on the Mechanical Properties of Full Construction Timber.” Wood Material Science and Engineering 2 (3-4): 138–146.
APA
Boonstra, Michiel J, Van Acker, J., & Kegel, E. V. (2007). Effect of a two-stage heat treatment process on the mechanical properties of full construction timber. WOOD MATERIAL SCIENCE AND ENGINEERING, 2(3-4), 138–146.
Vancouver
1.
Boonstra MJ, Van Acker J, Kegel EV. Effect of a two-stage heat treatment process on the mechanical properties of full construction timber. WOOD MATERIAL SCIENCE AND ENGINEERING. 2007;2(3-4):138–46.
MLA
Boonstra, Michiel J, Joris Van Acker, and Edo V Kegel. “Effect of a Two-stage Heat Treatment Process on the Mechanical Properties of Full Construction Timber.” WOOD MATERIAL SCIENCE AND ENGINEERING 2.3-4 (2007): 138–146. Print.