Your search resulted in 612 documents. Displaying 25 entries per page.
Natural durability of 9 tropical species suitable for round wood timber building: fungi and termites laboratory screening tests
2023 - IRG/WP 23-11013
In numerous tropical forest species, wood properties are poorly described and wood is under-valorized. Especially very few is known about small diameter trees although they may be used, directly as round wood, in construction timber building. A selection of abundant species was done and characterization tests were performed to assess their usability as building material. The aim of this work was t...
M Leroy, K Candelier, J Damay, J Bossu, R Lehnebach, M-F Thevenon, J Beauchene, B Clair
Challenges in managing very long-term field tests
2023 - IRG/WP 23-30779
Field testing of wood preservatives has been on-going in Petawawa, Ontario, Canada since at least 1937. Many of the treated roundwood posts from these early experiments are still in test, and include preservatives still used today, including creosote, copper naphthenate, pentachlorophenol and CCA. Performance data from selected experiments more than 50 years old are reported and we discuss some of...
R Stirling, D Wong
Establishing the minimum effective penetration of wood preservatives in the refractory heartwood of E. nitens
2023 - IRG/WP 23-30780
Conventional pressure treatment of many Australian hardwoods results in little to no penetration of heartwood and a non-uniform envelope treatment of <5 mm surrounding a mostly untreated core. This is a major issue for many of the low durability plantation hardwood timbers that are grown in Tasmania, which contain high percentages of heartwood. Long term studies on softwoods such as spruce decking...
J R Vargas, J J Morrell, L Yermán, K C Wood
Adhesion and performance of exterior wood coatings on chemically and thermally modified wood – Results from 5.5 years outdoor exposure
2023 - IRG/WP 23-40964
Non-durable softwood and hardwood species were treated with the water-soluble cyclic N-methylol compounds 1,3-dimethylol-4,5-dihydroxyethyleneurea (DMDHEU) and methylated DMDHEU. One half of the modified specimens were coated with a waterborne acrylic coating system prior a natural weathering for 5.5 years according to EN 927-3 (2020). By frequent evaluations, the impact of chemical modifications ...
L Emmerich, H Militz
Failure characteristics of thermally modified poplar wood subjected to mechanical tests
2023 - IRG/WP 23-40983
Poplar (Populus spp.) are among the fastest growing timber species and have been widely planted for use in plywood, composites, pallets, furniture components and paper production. However, the low density of the wood limits many structural applications and the wood has little resistance to biodegradation. Thermal modification represents one approach to improving durability by changing the moistur...
E Bari, M Ghorbanian Far, N Moradi, J J Morrell, G Daniel, B Mohebby, R Hosseinpourpia, M Humar
Exposure tests on railroad ties treated with DOT
2024 - IRG/WP 24-20705
Keruing railroad ties were treated with disodium octaborate tetrahydrate (DOT) to retentions of 0.7 to 1.7% boric acid equivalent (BAE) and selected borate treated ties were subsequently over treated with creosote/diesel fuel mixture. The treated ties were exposed in a simulated railway track test bed in Malaysia. The leaching of borate was measured over 5 years. BAE in the ties after 5 years of e...
L Arthur, J-W Kim
Barriers of polyglycol/borate treated wood prevent termite attack to untreated wood above them in 10-year field tests
2024 - IRG/WP 24-20709
As a pioneer in wood protection and borate research Terry Amburgey, a lifetime member of the IRG, had many projects where borates were used in subsequently commercially very successful applications. This paper is one of the initial research projects that lead to polyglycol borates being used as a standalone treatment to protect against termites in new homes which has now been well proven over the ...
K W Ragon, J D Lloyd, T L Amburgey
Potential of heartwood extracts as wood preservatives combined with linseed oil in 8-year above-ground and in-ground field trials
2024 - IRG/WP 24-20719
The current study assessed the efficacy of heartwood extracts from Tectona grandis, Dalbergia sissoo, Cedrus deodara, and Pinus roxburghii, combined with linseed oil, as protectants for two non-durable wood species against termites and decay fungi. Stakes measuring 45.7 × 1.9 × 1.9 cm and blocks measuring 12.5 × 3.75 × 2.5 cm of the sapwood of southern pine (Pinus sp.) and cottonwood (Populus ...
M E Mankowski, G T Kirker, B Hassan
Evaluation of the water exclusion ability and inherent bioactivity of heartwood against decay in Japanese and European wood species via above-ground exposure and water absorption tests
2024 - IRG/WP 24-40998
The natural durability of wood has been thought to mainly depend on bioactive extractives and the water exclusion ability. To clarify the contribution of each factor to wood durability, above-ground exposure tests were conducted on Japanese and European wood species. A double-layer test was carried out using heartwood specimens of four wood species, i.e., Japanese cedar, Japanese cypress, Scots pi...
T Osawa, R Noda, K Yamamoto
Field facility for conducting wood durability tests at LSU Agricultural Center
2024 - IRG/WP 24-41012
Efforts by Louisiana State University Agricultural Center (LSU AgCenter) to conduct wood durability research on C. formosanus and other wood-related topics, have led to establishing three field research sites to test wood products against Formosan subterranean termites (New Orleans, La), and native subterranean termites (Franklinton, LA), and to test utility poles for outdoor exposure, decay resis...
Q Wu, J Curole
Copper migration from preservative-treated Douglas-fir decking: models vs laboratory leaching data
2024 - IRG/WP 24-50390
The ability of a model to predict copper migration from Douglas-fir treated with organic metallic substances into a freshwater slough was evaluated against data generated through simulated overhead leaching. The model predicted very high loadings of ammoniacal copper zinc arsenate, alkaline copper quaternary or copper azole that had the potential to impact water quality while data from the exper...
M J Konkler, G Presley, J J Morrell, T Singh
Quantitative assessment of wood preservative emissions to waterways
2024 - IRG/WP 24-50393
The Organisation for Economic Co-operation and Development (OECD) Emission Scenario Document (ESD) for Wood Preservatives provides methods to quantify the release of active substances from treated wood for various scenarios including sheet pilings in a flowing waterway (OECD 2013). The ESD is used for environmental risk assessment of wood preservatives according to the Biocidal Products Regulation...
K J Rader, R Carbonaro, C Mackie