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Published VersionCC BY V4.0, Open Access
Journal article
Evaluation of Selected Accelerated Above-Ground Durability Testing Methods for Wood after Ten Years Exposure
Forests, Vol.11(5), pp.1-11
2020
Abstract
Traditional benchmark wood durability testing methods such as stake tests take many years to give conclusive results, and in-ground tests do not always indicate the efficacy of preservatives in above-ground situations. To find test methods that would shorten the time required for wood evaluation for above-ground end uses, a series of different types of accelerated durability tests were set up. Five types of test: ground proximity, two types of decking, flat panels and double layer, were reassessed after ten years to determine whether the decay rankings given to the various types of preservative had changed over the extended exposure period. Exposure conditions varied between tests, with ground proximity being close to ground, and the double layer test carried out in very wet conditions, while raised decking and flat panel tests were relatively dry. In all of these tests, the preservative retention was 25% of the normal H3 retention. The results indicated that the ground proximity tests gave the fastest and most reliable results. Flat panels contained the next highest decay rates, followed by ground-level decking, double layer and raised decking. The evaluation and comparison of these five test methods after ten years' field exposure confirmed the trend and relative decay rate that was observed at four-year exposure. The use of a regression model for prediction showed a statistically significant overall relationship between decay scores in 2011 and 2017 (coefficient = 0.14 +/- 0.07, d.f. = 345.7, t = 2.038,p= 0.042). When resistance to decay was compared between preservatives, copper-chrome arsenate (CCA)-treated pine and naturally durable spotted gum samples were in better conditions than pine treated with any of the other preservatives.
Details
- Title
- Evaluation of Selected Accelerated Above-Ground Durability Testing Methods for Wood after Ten Years Exposure
- Authors
- Tripti Singh (Corresponding Author) - ScionDave Page (Author) - Scion
- Publication details
- Forests, Vol.11(5), pp.1-11
- Publisher
- MDPI AG
- Date published
- 2020
- DOI
- 10.3390/f11050559
- ISSN
- 1999-4907
- Copyright note
- © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
- Grant note
- This research was funded by Ministry of Business, Innovation and Employment (MBIE), Wellington, New Zealand.
- Organisation Unit
- National Centre for Timber Durability and Design Life
- Language
- English
- Record Identifier
- 99979641002621
- Output Type
- Journal article
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- Forestry