Conference paper
Determining the minimum CCA penetration depth required to protect E. nitens heartwood from fungal decay
Proceedings of the 120th Annual Meeting of the American Wood Protection Association, pp.169-175
American Wood Protection Association (AWPA) Annual Meeting, 120th (Portland, United States, 29-Apr-2024–01-May-2024)
American Wood Protection Association
2024
Abstract
Traditional pressure treatment of many Australian hardwoods often yields limited penetration into the heartwood and an uneven treatment of less than 5 mm around a mostly untreated core. These results fail to meet the current standards. This poses a significant challenge for many low-durability plantation hardwoods in Australia, which contain substantial proportions of heartwood. While extended studies on softwoods like spruce decking indicate that superficial barrier treatments can offer decades of protection, it remains uncertain if similar treatments would be as effective for lower durability hardwoods. Conducting field tests to yield meaningful results would require several decades. Expedited laboratory decay tests might help bridge this testing gap.
This research assessed a laboratory technique to establish the minimum effective level of chromated copper arsenate (CCA) penetration into Eucalyptus nitens heartwood that prevents fungal colonization by the brown rot fungus Fomitopsis ostreiformis. Visual observations and culturing indicated that 2 and 4 mm deep barriers did not prevent fungal colonization into untreated surfaces beneath the treated layer. Six mm of penetration effectively precluded fungal colonization when aid by a waterproofing and tar varnish coating.
Details
- Title
- Determining the minimum CCA penetration depth required to protect E. nitens heartwood from fungal decay
- Authors
- Juan Vargas Garcia (Author) - University of the Sunshine Coast, Queensland, School of Science, Technology and EngineeringLuis Yermán MartinezKyra C WoodTripti Singh - University of the Sunshine Coast, Queensland, National Centre for Timber Durability and Design Life
- Publication details
- Proceedings of the 120th Annual Meeting of the American Wood Protection Association, pp.169-175
- Conference details
- American Wood Protection Association (AWPA) Annual Meeting, 120th (Portland, United States, 29-Apr-2024–01-May-2024)
- Publisher
- American Wood Protection Association
- Date published
- 2024
- Organisation Unit
- National Centre for Timber Durability and Design Life; School of Science, Technology and Engineering
- Language
- English
- Record Identifier
- 991076698102621
- Output Type
- Conference paper
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