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Investigating water transport in MDF and OSB using a gantry-based X-ray CT scanning system

Wanzhao Li (UGent) , Jan Van den Bulcke (UGent) , Thomas De Schryver (UGent) and Joris Van Acker (UGent)
(2016) WOOD SCIENCE AND TECHNOLOGY. 50(6). p.1197-1211
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Abstract
Both medium density fiberboard (MDF) and oriented strand board (OSB) are important engineered wood products. Water uptake can decrease their physical and mechanical properties as well as induce fungal decay. It is therefore essential to understand the water transport behavior in these products in detail. In this research, a state-of-the-art gantry-based X-ray CT scanner was used to investigate the water transport and the internal microstructure of the specimens from different types of MDF and OSB during water uptake. The results show that water, obviously, is mainly absorbed from the sides of all specimens during immersion testing. Water can reach the interior of the small specimens within 1 h through large fibers and strands. Although water movement through voids is slow, high water content can be reached when these voids are filled; for example, moisture content of more than 100 % is found in MDF. A compact structure can effectively decrease water accumulation in voids. Furthermore, the presence of a water-resistant adhesive, a water-repellent additive and acetylated fibers clearly influences water transport behavior in wood fibers and voids, increasing water resistance and improve structural stability of MDF. Moisture dynamics of OSB are different, among others influenced by orientation of the strands: grain direction perpendicular to the water uptake direction can protect OSB from water penetration. Furthermore, strands covered with resin have a good water resistance.
Keywords
MEDIUM DENSITY FIBERBOARD, ORIENTED STRAND BOARD, MECHANICAL-PROPERTIES, COMPUTED-TOMOGRAPHY, WOOD, ABSORPTION, RESISTANCE, ADHESIVE

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Chicago
Li, Wanzhao, Jan Van den Bulcke, Thomas De Schryver, and Joris Van Acker. 2016. “Investigating Water Transport in MDF and OSB Using a Gantry-based X-ray CT Scanning System.” Wood Science and Technology 50 (6): 1197–1211.
APA
Li, Wanzhao, Van den Bulcke, J., De Schryver, T., & Van Acker, J. (2016). Investigating water transport in MDF and OSB using a gantry-based X-ray CT scanning system. WOOD SCIENCE AND TECHNOLOGY, 50(6), 1197–1211.
Vancouver
1.
Li W, Van den Bulcke J, De Schryver T, Van Acker J. Investigating water transport in MDF and OSB using a gantry-based X-ray CT scanning system. WOOD SCIENCE AND TECHNOLOGY. 2016;50(6):1197–211.
MLA
Li, Wanzhao, Jan Van den Bulcke, Thomas De Schryver, et al. “Investigating Water Transport in MDF and OSB Using a Gantry-based X-ray CT Scanning System.” WOOD SCIENCE AND TECHNOLOGY 50.6 (2016): 1197–1211. Print.
@article{8512098,
  abstract     = {Both medium density fiberboard (MDF) and oriented strand board (OSB) are important engineered wood products. Water uptake can decrease their physical and mechanical properties as well as induce fungal decay. It is therefore essential to understand the water transport behavior in these products in detail. In this research, a state-of-the-art gantry-based X-ray CT scanner was used to investigate the water transport and the internal microstructure of the specimens from different types of MDF and OSB during water uptake. The results show that water, obviously, is mainly absorbed from the sides of all specimens during immersion testing. Water can reach the interior of the small specimens within 1 h through large fibers and strands. Although water movement through voids is slow, high water content can be reached when these voids are filled; for example, moisture content of more than 100 \% is found in MDF. A compact structure can effectively decrease water accumulation in voids. Furthermore, the presence of a water-resistant adhesive, a water-repellent additive and acetylated fibers clearly influences water transport behavior in wood fibers and voids, increasing water resistance and improve structural stability of MDF. Moisture dynamics of OSB are different, among others influenced by orientation of the strands: grain direction perpendicular to the water uptake direction can protect OSB from water penetration. Furthermore, strands covered with resin have a good water resistance.},
  author       = {Li, Wanzhao and Van den Bulcke, Jan and De Schryver, Thomas and Van Acker, Joris},
  issn         = {0043-7719},
  journal      = {WOOD SCIENCE AND TECHNOLOGY},
  language     = {eng},
  number       = {6},
  pages        = {1197--1211},
  title        = {Investigating water transport in MDF and OSB using a gantry-based X-ray CT scanning system},
  url          = {http://dx.doi.org/10.1007/s00226-016-0855-8},
  volume       = {50},
  year         = {2016},
}

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