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Gaspar, F., Lopes, J., Cruz, H., Schwanninger, M., Rodrigues, J..
(2009): Application of near infrared spectroscopy and multivariate data analysis for the evaluation of glue lines of untreated and copper azole treated laminated timber prior and after ageing
POLYM DEGRAD STABIL, 94, 1061-1071; ISSN 0141-3910 FullText FullText_BOKU

Abstract:: The necessity for inspection and assessment of glued laminated timber structures in service has raised interest in the evaluation of the glue lines. Glue line spectra were analysed and are discussed in detail with respect to spectral contributions from the adhesive, the hardener, the wood lamella below the adhesive, the curing temperature as well as ageing-related spectral changes. The combination of near infrared (NIR) spectroscopy and principal component analysis (PCA) allowed distinguishing between aged and non-aged samples and different copper azole preservative treatment levels of phenol-resorcinol-formaldehyde (PRF) glue lines. NIR-based partial least squares (PLS) regression modelling was performed for the glue line shear strength and for the curing temperature. These findings show that NIR spectroscopy is a fast and useful technique to evaluate the degradation on the PRF glue lines of untreated and copper azole treated laminated timber. (C) 2009 Elsevier Ltd. All rights reserved.
Authors BOKU Wien:: Schwanninger Manfred
Find related publications in this database (Keywords): Wood; Delamination; Near infrared (NIR) spectroscopy; Partial least squares regression; Copper azole; Phenol-resorcinol-formaldehyde (PRF) glue lines