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    Author(s): Charles G. CarllAlex C. Wiedenhoeft
    Date: 2007
    Source: 41st International Wood Composites Symposium proceedings : March 26-28, 2007, Seattle, WA. [Pullman, Wash.] : Washington State University, 2007: 16 pages.
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (723 KB)

    Description

    Small specimens of sheathing-grade oriented strandboard (OSB) and sheathing-grade plywood were evaluated for retention of mechanical properties in exterior exposure over a series of exposure times. In contrast to previous studies of this nature, specimens at prolonged exposure times were also evaluated (in something more than a cursory manner) for presence of decay. Specimen size and mounting configuration had been selected to maximize wetting and drying induced stress on adhesive bonds but discourage water retention and thus the likelihood of decay. Mechanical properties decreased progressively with exposure time, at a decreasing marginal rate, without a steady level ever being attained. All panel types included in this study became infested with decay fungi by 7 years of exposure, although infestation was clearly most severe in panels fabricated from aspen, and decay induced degradation evidently became more pronounced with progressive exposure time beyond 7 years. In this study, the assumption that test fence exposures can be designed to induce moisture cycling induced stresses on adhesive bonds while simultaneously excluding infestation by decay fungi proved to be erroneous. Infestation was apparently by decay fungi adapted to rapid fluctuations in moisture and temperature conditions, species that are not recognized as commonly causing decay of wood products.

    Publication Notes

    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Carll, Charles G.; Wiedenhoeft, Alex C. 2007. Mechanical property loss and the occurrence of wood decay during experimental outdoor aging of wood based panels. 41st International Wood Composites Symposium proceedings : March 26-28, 2007, Seattle, WA. [Pullman, Wash.] : Washington State University, 2007: 16 pages.

    Keywords

    Weathering, particle board, mechanical properties, deterioration, wood-decaying fungi, biodegradation, plywood, accelerated life testing, exposure, resistance to decay, moisture, decay fungi, durability, OSB, oriented strandboard, decay, physical properties

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