Moisture movement and thickness swelling in oriented strandboard. Part 2: Analysis using a nuclear magnetic resonance imaging body scanner |
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| Authors: | Jeroen H. van Houts Siqun Wang Huiping Shi George W. Kabalka |
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| Affiliation: | (1) Van Houts Consulting, 45 Wright Road, RD2 Pukekohe, New Zealand;(2) Department of Forestry, Wildlife and Fisheries, Tennessee Forest Products Center, The University of Tennessee, 2506 Jacob Drive, Knoxville, TN 37996-4570, USA;(3) Department of Radiology, University of Tennessee Medical Center, Knoxville, TN 37920, USA;(4) Department of Chemistry, The University of Tennessee, Knoxville, TN 37996, USA |
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| Abstract: | The previous paper in this series demonstrates the use of a nuclear magnetic resonance (NMR) micro-imaging system to observe the movement of liquid water through small specimens (11 × 16 mm2 cross-section) of oriented strandboard (OSB) and solid wood. In the present paper, a NMR body scanner is utilized to obtain images of moisture penetration into ASTM D 1037–99 standard sized (152 × 152 mm2) thickness swelling specimens at different intervals during water soaking. As with the micro-imaging study, silicone was applied to the surfaces and edges of some of the specimens in order to observe the directional characteristics of moisture movement through OSB. Specimens with commercially applied edge sealant were also included in the study in order to observe the effectiveness of the sealant of reducing moisture penetration and thickness swelling. The presence of voids and areas of low density were shown to contribute significantly to moisture penetration into the specimens. |
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