Your search resulted in 811 documents. Displaying 25 entries per page.
Evaluation of natural durability of solid wood and mixed heartwood-sapwood Cypress (Cupressus sempervirens L.) plywood against Basidiomycete fungi
2008 - IRG/WP 08-10645
The aim of this research was to study the response of mixed plywoods composed of durable heartwood and non-durable sapwood to fungal attack. For this purpose, the species of Cupressus sempervirens (cypress) was chosen for its well-known durable heartwood. The evaluation of durability of plywood panels against fungi was done according to ENV 12038 and the fungi used were Coriolus versicolor (CV) an...
F Faraji, M F Thévenon, N Lemenager, B Thibaut
Needs for wood durability research on planted tree species in the tropics
2008 - IRG/WP 08-10651
The area of forest plantation has been expanding especially in tropical Asia since 1990’s. Most of them are developed for pulp and paper industries and planted with fast growing trees. It is expected that wood from those fast growing trees are also used for value added products such as sawn timber. In order to promote the utilization of fast wood as the resource of value added products, natural...
K Yamamoto, T Toma, Ngo Duc Hiep, Nguyen Trong Nhan
Influence of boiling on the quality of oakwood during peeling processes
2008 - IRG/WP 08-10656
Peeling process may be an efficient technology to transform secondary quality trees into veneer. After cutting and drying, veneer can be used for plywood or LVL production. If natural durability of these new panels is sufficient, they may be used for joinery production without preservative treatment. With the collaboration of ENSAM Cluny, Zvolen University and Pau University, we have investigated ...
M Svoradová, F Charrier, R Marchal, L Bléron, B Charrier, J-C Butaud
Natural durability of fast growth plantation Eucalyptus grandis Hill, ex Maiden
2008 - IRG/WP 08-10660
One of the fast growing species cultivated in Uruguay of mayor economical importance is Eucalyptus grandis. Physical and mechanical properties of juvenile and mature wood from different regions have been deeply studied. However, since no scientific data of natural durability of this specie has been reported, natural durability of E. grandis from two sites (Rivera and Rio Negro) was evaluated. Two ...
S Böthig, A Sánchez, J Doldán
Biological control of the sapstain fungus Diplodia pinea (syn. Sphaeropsis sapinea) in the field
2008 - IRG/WP 08-10663
Diplodia pinea, syn. Sphaeropsis sapinea, is well known as the worldwide ocurring causal agent of the Diplodia tip-blight disease on various pine species, leading to great losses of valuable wood in the forests. Moreover, this fungus is also responsible for the fornation of sapstain of felled logs, leading to undesired disation of surface layers in the OSB manufacturing industry. In Central Europe...
C Gradinger, T Boisselet, K Messner, K Fackler
Natural durability of different wood species in above ground applications - Weight and MOE loss
2008 - IRG/WP 08-10667
In Norway, exterior wood structures have traditionally, nearly exclusively been made of untreated Norway spruce (Picea abies (L.) Karst) and pressure treated Scots pine (Pinus sylvestris L.). In recent years there has been a tendency that other wood species, like various Norwegian hardwoods or imported species, have been used in exterior above ground applications, often not surface treated. For se...
F G Evans, P-O Flæte, G Alfredsen
Evaluation and identification of extractives from Iranian walnut (Juglans regia L.) by GC/MS technique for protection of non-decay resistant species
2008 - IRG/WP 08-10670
The use of walnut extractives is interest as environment friendly wood preservatives in the wood preservation industry. In this study, organic solvents were used to remove extractives from Iranian walnut heartwood samples. The solvent was removed by rotoevaporation, and Identification of chemical compounds in the Walnut extractives was done by using GC/MS technique. The toxicity of various extract...
S K H Hashemi, D Parsapajouh, H Khademi Eslam
Development of an International Use Classification System
2008 - IRG/WP 08-20380
Working Party 2.5 of the IRG was set up in 1995 in response to discussion around proposals for an International Wood Preservation Standard. Two years later, ISO Technical Committee 165 Timber Structures set up a subcommittee SC1 Wood Materials – Durability and Preservation to address this issue. It was agreed that neither the European Hazard Class system nor any other regional system could be ...
P I Morris
A preliminary note on the role of moisture absorption rate in durability assessment
2008 - IRG/WP 08-20383
The rate of moisture uptake was studied in 15 wood species using vermiculite at varying moisture levels as the exposure medium. As might be expected, moisture uptake varied widely among the species studied. While some of the more durable wood species were also resistant to moisture uptake, this was not always true. The results are discussed in relation to performance in under varying environmenta...
J J Morrell, L P Francis
Treatment of Selected Lesser Used Timber Species against Subterranean Termites using Heartwood Extracts from Teak (Tectona grandis) and Dahoma (Piptadeniastrum africanum)
2008 - IRG/WP 08-30476
Lesser used timber species represent a valuable material for all-purpose uses. However, most of them are not durable. They are, for effective utilization, often treated with all manner of toxic synthetic substances to enhance their natural durability, especially in the tropics where conditions favour their deterioration. Most of these toxic synthetic substances often pose a threat to the environme...
A Asamoah, C Antwi-Boasiako, K Frimpong-Mensah
Preliminary investigation of biological resistance, water absorption and swelling of thermally compressed pine wood panels
2008 - IRG/WP 08-40396
Wood can be modified by compressive, thermal and chemical treatments. Compression of wood under thermal conditions is resulted in densification of wood. This study evaluated decay and termite resistance of thermally compressed pine wood panels at either 5 or 7 MPa and at either 120 or 150?C for one hour. The process caused increases in density and decreases in thickness of the panels; however, lab...
Ö Ünsal, S N Kartal, Z Candan, R Arango, C A Clausen, F Green III
Termite resistance of DMDHEU-treated wood
2008 - IRG/WP 08-40401
Chemical wood modification with dimethyloldihydroxy-ethyleneurea (DMDHEU) or its derivatives are applicable to both solid lumber and wood-based composites. Advantages of DMDHEU-based modification are an increase of dimensional stability and high durability against white, brown and soft rot fungi. At higher chemical loadings, the hardness of the wood is considerably increased. Due to the durabil...
H Militz, S Schaffert, B C Peters, C J Fitzgerald
COST Action E37. Sustainability Through New Technologies For Enhanced Wood Durability -
2008 - IRG/WP 08-40417
The main overall objective of the Action was to concentrate on the contribution of wood durability to sustainability through the development of systems for quality assurance and performance classification of modified wood and wood products as alternatives to wood treated with traditional preservatives. By this means it seeked to improve and consequently to increase the cost-effective use of compon...
R-D Peek, J Van Acker
Bi-oleothermal treatment of wood at atmospheric pressure: resistance to fungi and insects, resistance to weathering and reaction to fire results
2008 - IRG/WP 08-40418
Bi-oleothermal process is a simple treatment which has been developped by CIRAD in cooperation with FCBA. It allows a deep impregnation of wood with hydrophobic products using cheap facilities. The process includes two steps at atmospheric pressure. The first one is a dipping of wood samples in a hot oil bath (between 110 °C and 200°C) which creates an overpressure inside the wood. The second on...
L Podgorski, I Le Bayon, I Paulmier, J-D Lanvin, V Georges, D Grenier, H Baillères, J-M Méot
Wood plastic composites from modified wood. Part 3. Durability of WPCs with bioderived matrix
2008 - IRG/WP 08-40423
The decay resistance of fully bio-derived wood plastic composites, WPCs, was tested in both laboratory and field tests. The laboratory tests were performed according to modified versions of AWPA E10 (soil-block test) and ENV 807 (tests in three un-sterile soils) and the field tests according to EN 252 (stakes in ground) and EN 275 (resistance to marine borers). The WPC materials for laboratory tes...
M Westin, P Larsson Brelid, B K Segerholm, M Van den Oever
Natural durability and anatomical features of teak (Tectona grandis) from plantations in Costa Rica
2008 - IRG/WP 08-10671
Teak (Tectona grandis) possesses superior mechanical properties and durability and is thus frequently used as an alternative to impregnated timber in Europe. Demand on teak has resulted in severe exploitation of the tropical teak forests in recent decades, but today the imported timber originates mainly from plantations and is certificated according to the Forest Stewardship Council (FSC) policy. ...
U J Wolfsmayr, N Terziev, G Daniel
Biological efficacy of micronized copper systems
2008 - IRG/WP 08-30485
Soil block, fungal cellar and field stake test data will be presented for micronized copper systems. The copper portion of the formulations is present as a fine dispersion of "micro" particulates while the co-biocide is present as either a soluble quat or an azole containing emulsion. This testing generally used the amine based counterpart as the control preservative system and the micronized fo...
C R McIntyre, M H Freeman
Control biológico de la mancha azul en madera aserrada de Pinus radiata D. Don.
2008 - IRG/WP 08-10681
Radiata pine wood is highly susceptible to the attack of sapstaining fungi promoting a discoloration which results in important economical losses. The use of chemicals, a customary procedure to prevent its occurrence is becoming nowadays, due to environmental concern, a more questionable practice. The biological control of blue stain fungi with albino isolates of the Ophiostoma genera appear to ...
J Navarrete, A Segura, P Martínez, R Vera, C Segovia, P Herrera, L Reyes, D McNew, T C Harrington, R L Farrell, J M Thwaites, B Held, R A Blanchette
Biological Performance of micronized copper wood preservative formulations in field and laboratory tests
2008 - IRG/WP 08-30488
Micronized Copper wood preservative formulations with different co-biocides were exposed to brown rot fungi in an 8-week AWPA E10 soil block decay test and two AWPA E7 ground-contact decay tests in Hawaii. The micronized copper formulations performed well against decay at or above the AWPA UC3 and UC4 retentions stipulated by the ICC-ES. Micronized copper preservatives performed comparably to a ...
G M Larkin, J Zhang, D L Richter, R J Ziobro, P E Laks
Effect of a biological treatment on below ground decay of Douglas-fir pole sections
2008 - IRG/WP 08-40433
The use of exogenous sugars to accelerate microbial growth and eventually limit available oxygen in soil surrounding wood in soil contact was investigated on untreated Douglas-fir poles exposed over a 3 year period in Western Oregon. Isolation frequencies differed markedly between treated and untreated poles and the treatment did appear to shift the frequency of some basidiomycetes. The treatment ...
C Freitag and J J Morrell
Effect of different ASAs (alkenyl succinic anhydrides) on the treatment of biological protection of wood in use class 4
2008 - IRG/WP 08-40440
The alkenyl suscinic anhydrides (ASAs) used in this work are adducts resulting from the maleinization reaction of fatty acid alkyl esters. Various products with different alkyl groups were synthesized from rapeseed (Brassica napus) oil esters, rich in oleic acid. The liquids obtained showed a viscosity similar to that of vegetable oils and a brown color. When applied into wood, a thermal treatment...
C Vaca-Garcia, O Pignolet
Natural Durability of Some Heartwood from European and Tropical African Trees against Marine Organisms
2009 - IRG/WP 09-10682
This study aims to investigate the natural marine durability of some tropical and domestic wood species in marine environment. A total of 33 tree species, comprising 18 European and 15 tropical originated trees were exposed to marine conditions in 6 meters depth for a period of 14 months at east and west Black sea, Mediterranean, Aegean, and Marmara coasts. The results indicated that wood species...
S Sen, H Sivrikaya, M Yalçın
Categorization of 300 timber, bamboo and cane grown in Bangladesh based on their families, origins, growths, physical and mechanical properties
2009 - IRG/WP 09-10684
In this study the 300 timber, bamboo and cane plants grown in Bangladesh have been classified into various categories based on their taxonomic families, origin of species, rate of growth, color of wood, texture of wood, shrinkage of wood, equilibrium moisture content (EMC) of wood, flammability of wood, cutting and sawing properties of timber, finishing and polishing qualities of wood, machining p...
A K Lahiry
Evaluation of the natural durability of reed (Phragmites australis) originating in the Fertö region (Hungary) against wood decay organisms as material for use in a sustainable motorway noise barrier
2009 - IRG/WP 09-10685
This work presents the research carried out to determine the natural durability of reed from the Fertö region of Hungary against wood decay organisms. The final objective of this study is to obtain sufficient relevant data in order that the reed may be used as a constituent element in a viable and sustainable motorway noise barrier, which has been developed within the European research project, k...
M T Troya, F Rubio, M J Prieto, D Lorenzo, J L Fernández-Cabo, R Schöftner
Study on the natural durability of Eucalyptus grandis wood from Argentina
2009 - IRG/WP 09-10689
In Argentina eucalypts are in second place of importance in planted area, after pines. Due to its high growth rates (from 35 to 55 m3/ha/yr), Eucalyptus grandis is the most important among the eucalypts planted in Argentina. Moreover, E. grandis is one of the species with the greatest potential in the country, because of its diversity of uses for high end and added value solid products. Due to the...
D Lorenzo, M T Troya, J C Piter, M Sánchez, C Baso