Your search resulted in 39 documents. Displaying 25 entries per page.
Termite resistance of pure and mixed heartwood-sapwood Cypress (Cupressus sempervirens L.) plywoods
2009 - IRG/WP 09-10693
The main objective of this research was to evaluate the ability of different plywoods made of durable heartwood and/or non-durable sapwood to resist termite damage. The well-known durable cypress (Cupressus sempervirens) was chosen for this study. The natural durability of cypress solid wood, divided into sapwood and heartwood, as well as the durability of 17 different laboratory manufactured plyw...
F Faraji, M-F Thévenon, B Thibaut
Performance of Fasteners in Treated Wood: A Comparative Study
2009 - IRG/WP 09-40465
Fastener performance is an important property for treated wood. Published data on screw and nail performance for different preservative systems currently on the market are, however, limited. In this study, screw and nail withdrawal strength for southern pine wood treated with ACQ (above ground and ground contact), MCQ (above ground and ground contact), borate (disodium octaborate tetrahydrate – ...
Q Wu, T Shupe, J Curole, K Ragon, M Voitier, M Freeman, D Ring
Effect of heating on aldehydes emissions from solid wood
2011 - IRG/WP 10-50277
We have found that acetaldehyde, a probable human carcinogen, is produced from wood through reaction with ethanol. Alcohols are increasingly being used in houses and buildings for cleaning purposes. Acetaldehyde emission from solid wood has been attributed to ethanol acidification by enzymes such as ethanol dehydrogenase. Heating could inactivate these enzymes. In this study, the effects of heatin...
A Ishikawa, K Miyamoto, S Tohmura, A Inoue
Decay initiation in plywood, OSB and solid wood under marginal moisture conditions
2011 - IRG/WP 11-20469
Hygrothermal models are increasingly used as research tools by building scientists and and design tools by designers to simulate heat, air, vapour, and water movements within and through building envelope and even to predict the consequences in terms of mould/decay growth and metal corrosion. This work was designed to generate data on decay initiation under marginal moisture conditions to support...
Jieying Wang, P Morris
Effects of nano-silver on brittleness of heat-treated solid woods
2011 - IRG/WP 11-40572
The present study is aimed at the effect of heat-treatment of normal as well as nano-silver-impregnated Populus nigra, Populus deltoides, and Fagus orientalis on brittleness. Specimens were impregnated with 200 ppm water-based solution of nano-silver particles under 3 bars in a pressure vessel using empty-cell process. For heat treatment, both nano-silver-impregnated and normal specimens were kept...
H Reza Taghiyari, B Moradi Malek, A Karimi
Determination of the natural durability of solid wood against wood-destroying fungi - a European round-robin test
2013 - IRG/WP 13-20511
In Europe the durability of wood against wood-destroying basidiomycetes is tested according to CEN/TS 15083-1 (2005). Hitherto existing experience with this standard is quite heterogeneous and results from previous round-robin tests have stayed unreported or have been reported incompletely. In particular the need for natural pre-weathering of the test specimens to allow potential detoxification of...
C Brischke, C R Welzbacher, A Gellerich, S Bollmus, M Humar, K Plaschkies, W Scheiding, G Alfredsen, J Van Acker, I De Windt
Ammoniacal zinc borate as solid wood preservative
2014 - IRG/WP 14-30659
Zinc borate, well-known for its fungicidal, insecticidal and flame resistant properties, is widely used in manufacture of lignocellulose particle board. This form of borate is the least water soluble form available providing advantages as well as disadvantages for use as a wood preservative. This form does not leach from wood under conditions of high humidity, but it is also very difficult to appl...
C Ibáñez, C Mantero, A Ibarra, M Rabinovich
Building solid foundations to support market growth of preserved wood in the UK – treatment quality, product approval and the largest national field trial of preservative treated wood in 50 years
2015 - IRG/WP 15-30662
The Wood Protection Association (WPA) has just commissioned Britain’s largest ever durability trial of home grown timber, having contracted Building Research Establishment (BRE) to conduct a long term controlled field trial of sawn and pressure treated British Softwood posts at two sites with differing soil conditions. This large scale Field Trial is the last of an innovative and substantial thr...
E Suttie, G Ewbank
Effects of heat treatment on sound absorption coefficients in nanosilver-impregnated and normal solid woods
2017 - IRG/WP 17-40770
Effects of impregnation with silver nano-suspension as well as heat-treatment on sound absorption coefficients (AC) were studied in tangential direction of five different solid woods based on their importance. AC was measured at two frequencies of 250 and 500 Hz. A 400 ppm nanosuspension was used for the impregnation; silver nanoparticles had a size range of 30-80 nm. Based on the obtained results...
A Esmailpour, J Norton, H R Taghiyari, H Zolfaghari, S Asadi
Effects of Nano-Wollastonite Impregnation on Fire Properties of Some Thermally-Treated Solid Wood Species
2017 - IRG/WP 17-40771
The effects of nano-wollastonite (NW) suspension impregnation on the fire-retarding properties of heat-treated solid wood of three species (beech, poplar, fir) were studied. Heat treatment was performed at two temperatures of 180 °C and 200 °C. Impregnation was carried out at a pressure of 3 bars for 30 min. The fire properties included ignition time, glowing time, back-darkening, back-splitting...
H R Taghiyari, R Hossinpourpia, S Adamopoulos, A Jahangiri, D Rabie
Solid Timber Bridges – Latest Developments
2017 - IRG/WP 17-40788
The technology of gluing in wood construction has evolved considerably in recent years. This has been shown especially in timber bridges that Glulam is now the main building material. A further development is the so-called block gluing, which provides a good basis for supporting structures. Numerous bridges, especially in central Europe, appeal by unique design and monolithic and solid construction. These structures base on two main developments: block lamination of glulam and the composite of timber and concrete to one structural system.
F Miebach
Terrestrial laser scanning (TLS) – a potential tool for improved utilisation of the natural durability of Scots pine for solid wood products
2019 - IRG/WP 19-50358
The natural durability of sapwood of most species is generally low, while heartwood can be more resistant to biodeterioration. For the sawmill industry various lumber products require certain diameters and lengths of the logs in addition to requirements for wood properties. When utilising the heartwood, it is therefore important to acquire information already in the forest about which trees that c...
P-O Flaete
Performance of resin-treated solid wood and laminated veneer lumber (LVL) under marine conditions
2021 - IRG/WP 21-10973
Wood is a traditional building material in the marine environment, where it is exposed to extremely harsh conditions. Most of the indigenous softwood and hardwood species in Europe are not durable against attack by marine organisms. Recently, wood modification has been considered as an alternative to protect non-durable wood species under use class (UC) 5 (EN 335, 2013) conditions. The present stu...
L Emmerich, C Brischke, S Bicke, H Militz
The impact of pre-drying on treatment level variations of esterified solid wood analysed by X-ray densitometry
2023 - IRG/WP 23-40977
Wood modification requires homogenous treatment levels within the wood matrix to prevent insufficiently treated areas being subject to biodeterioration. Esterification of wood by citric acid and sorbitol can show differences in density caused by uneven chemical distribution during the curing phase and can be detected by x-ray densitometry. This study used density profiling to investigate the influ...
A Treu, S O Amiandamhem, E Larnoy