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

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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.
Keywords
Heat treatment, mechanical properties, wood modification, Norway spruce

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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.
@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},
}

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