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    Description

    This poster presentation reports on recent laboratory work aimed at quantifying the biodegradation process of wood during exposure to natural weathering. Approximately 330 southern pine lumber specimens were placed “above-ground” at an outdoor exposure site near Gulfport, Mississippi for periods up to five years. An additional 90 specimens were stored indoor to serve as controls. Two chemical preservative treatments, CCA and DDAC, were also applied to several sets of lumber specimens. NIR spectroscopy techniques were used to characterize the condition of the weathered wood surface. Multivariate statistical tools were used to further analyze NIR spectra data. Results indicate that NIR spectra analysis, in conjunction with multivariate statistical analysis, has good potential for monitoring changing surface conditions of wood structural members subjected to natural weathering.

    Publication Notes

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Wang, Xiping; Wacker, James P. 2006. Using NIR spectroscopy to predict weathered wood exposure times. WCTE 2006 : 9th World Conference on Timber Engineering, August 6-10, 2006, Portland, OR, USA : program and abstracts. Portland, Or. : World Conference on Timber Engineering, [2006]: [5] pages.

    Keywords

    Wood preservatives, multivariate analysis, near infrared spectroscopy, nondestructive testing, spectrum analysis, deterioration, weathering, preservatives, DDAC, Didecyl-dimethyl ammonium chloride, treated wood, chromated copper arsenate, CCA, durability, southern pine, wood decay, exposure tests

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https://www.fs.usda.gov/treesearch/pubs/27397