Your search resulted in 212 documents. Displaying 25 entries per page.
Commercial Timbers of Kenya
2016 - IRG/WP 16-10876
The global timber trade has for years been too familiar with an assortment of available African timbers, reputed for their appearance in terms of colour, grain, pattern and durability. African forests are fast disappearing through over-exploitation as a result of demand for agricultural land. Kenya, the home of some of these valuable hardwoods, has been similarly affected, with its forest land cov...
R Venkatasamy
Borate and Copper Naphthenate Dual Treatment of Bridge Timbers-Borate movement over time
2017 - IRG/WP 17-40795
Preservative treated wooden bridge ties in the South Eastern USA have a service life of about 15 to 20 years, which falls well below the average service life of 40 years of railroad cross ties (sleepers). It has been shown that cross tie life is significantly extended using borate dual treatment and this is now commercialized in bridge timbers using borate inserts. In previous research, it was dem...
J-W Kim, J D Lloyd
Dual Borate and Copper Naphthenate Treatment of Bridge Timbers:- Potential Performance Enhancements and Cost Savings
2017 - IRG/WP 17-40797
Dual treatment technology combining diffusible preservatives with oil borne preservatives, widely used for crossties in the USA, has now also been commercialized with bridge ties/timbers. In order to understand the implications of these changes, the historic service life of creosote treated bridge timbers in northern and southeastern USA were considered as well as field test data for both creosote...
J Lloyd, C Brischke, R Bennett, A Taylor
Assessment of the durability of a lesser known species (Borassus aethiopum Mart.) against termite and fungi from different ecozones in Nigeria
2018 - IRG/WP 18-10924
Scarcity of choice timber species in Nigeria necessitates research into alternative species. Efficient utilisation of alternative species such as Borassus aethiopum requires adequate understanding of their wood properties and within tree variations. However, information on potential of B. aethiopum as alternative to choice timber has not been adequately documented especially in the area of durabil...
O O Yekin, A R Ojo
Performance of untreated timbers in above ground decking tests: Preliminary results from an international collaborative trial
2019 - IRG/WP 19-10940
The ability to accurately predict wood decay risks under varying environmental conditions has long been of interest to timber users. Accurate predictions are difficult owing to the myriad of variables associated with the decay process including wood species, wood inhabiting organisms, timber building element design and environmental conditions. Despite these difficulties, decay predictions have be...
L P Francis, J Norton, E Melcher, A H H Wong, J Kok Lai, M Klamer, M J Konkler, J J. Morrell
Visual assessment of longitudinal wheel timbers and assessing the feasibility of extending wheel timber service life in the UK railway network
2019 - IRG/WP 19-20651
Timber has been a versatile building material for centuries and during the start of the Railway Age in the nineteenth century it was in considerable demand for use in the railway network, particularly bridge building. Timber is still in service and widely used throughout the UK railway network. The resilience and favourable strength to weight ratio and its relative ease of fabrication make it an...
J R Williams
Protecting Sustainable Wood Infrastructure ̶ Improving the Performance of Poles, Piles, Ties & Timbers with Dual Treatments
2019 - IRG/WP 19-30735
Wood is by far the best structural material in terms of environmental impact, as shown by a number of LCA studies. This environmental impact superiority can be improved if the longevity of the commodity is extended. The main durability concern in large cross-section treated materials is the susceptibility of the heartwood to decay, as it is not typically treatable using traditional methods. This ...
J Lloyd, A Taylor, C Brischke, N Irby, M Manning
Treatability of native and exotic alternative timber species
2019 - IRG/WP 19-40864
The service life of moderately durable species can be extended significantly if the challenge of effective treatment of refractory wood species can be overcome. Along with preservative effectiveness, the performance of preservative in treated wood depends on factors such as retention and penetration in treated wood, the wood anatomy, the uniformity of penetration and micro-distribution within the ...
D Page, T Singh
Longterm Performance of Treated Timbers in Marine Exposures
2020 - IRG/WP 20-10969
The performance of preservative-treated or modified woods in marine exposures was evaluated at test sites in Newport, Oregon, USA and Brisbane, Queensland, Australia. All samples have exhibited excellent performance at the Newport, Oregon site, while attack was more aggressive at the sub-tropical Brisbane site. Acetylated wood as well as samples treated with 7.3% chromated copper arsenate (CCA-T...
M Konkler, A R Zahora, J Norton, J J Morrell
Sterilization of Large Timbers during Preservative Treatment: How Quickly We Forget
2020 - IRG/WP 20-40902
Air seasoning is a common method of moisture management in utility poles and is done de facto during pole storage prior to treatment. However, extended air drying prior to treatment encourages fungal attack and can facilitate establishment of decay fungi in poles before a protective preservative barrier is applied. This problem can be mitigated by proper air-seasoning methods coupled with heat ste...
G Presley, J Cappellazzi, M Konkler, K Maguire, R Nelson, J J Morrell
Susceptibility of selected Australian commercial timbers to West Indian drywood termite Cryptotermes brevis
2023 - IRG/WP 23-11003
West Indian drywood termite (Cryptotermes brevis) is a globally distributed timber pest and is invasive in Queensland, Australia, causing widespread damage to structures and large economic impacts in control and repair costs. Despite this, the knowledge of which specific timbers are susceptible to attack is limited and requires investigation. Two six-week feeding trials were performed, exposing se...
W Haigh, R A Hayes, B Hassan
Long-term Performance of Treated Timbers in a Sub-tropical Marine Exposure
2023 - IRG/WP 23-11015
The long-term performance of preservative-treated and modified wood in marine exposures was assessed in Brisbane, Queensland, Australia. This report describes the final destructive assessment of the surviving Australian panels after 11 years of exposure. This site presents the potential for attack by shipworms (likely Bankia spp.), pholads (Martesia striata), Limnoria and Sphaeroma terebrans. Mos...
E L Galore, J Norton, A Zahora