Estimating the moisture excluding effectiveness of surface coatings on Southern Yellow pine using acoustic emission technology |
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| Authors: | R W Rice D P Phillips |
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| Institution: | (1) Department of Forest Management, 115 Nutting Hall, University of Maine, Orono, Maine 04469, USA, US;(2) The Oliver Stores, Route 2, Hermon, Maine, USA, US |
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| Abstract: | In this research, acoustic emission technology was used to estimate the moisture excluding effectiveness of coatings on wood.
Moisture interaction with wood causes damage, and coatings such as paints and varnishes can effectively limit this interaction.
Over time, the moisture excluding effectiveness of wood is reduced by the actions of weathering and the resulting wood-water
interaction leads to problems due to the dimensional instability of the wood. Five coating types, at two spreading levels,
were applied to samples of southern yellow pine. The samples were exposed to three weathering conditions to simulate the effects
of exposure then immersed in water while the moisture interaction was monitored using acoustic emission monitoring equipment.
Cumulative counts as well as changes in size and moisture content were measured or calculated. The results show that acoustic
emission technology is an effective and sensitive estimator of the moisture excluding effectiveness of coatings on wood. The
acoustic emission method is sensitive to local changes and coating fractures whereas the more traditional methods are sensitive
to gross changes in sample characteristics. Of five coatings tested, the most effective one was found to be an oil-based paint,
and the worst performance was by a water-based, clear poly-urethane.
Received: 10 September 1998 |
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