Your search resulted in 511 documents. Displaying 25 entries per page.
Termite resistance of some modified wood species
2009 - IRG/WP 09-40449
During the last few decades, researchers worldwide have investigated and developed new treatment techniques to improve intrinsic wood properties. Some of these techniques were introduced to the market recently and are gaining in importance.. Various wood properties of these new materials have been studied intensively. These include physical-mechanical properties (dimensional stability, moisture ...
H Militz, B C Peters, C J Fitzgerald
Assessment of the marine borer resistance and abrasion resistance of lesser known hardwood timber species for use in marine construction
2010 - IRG/WP 10-10711
Naturally durable species of timber are used as an alternative to preservative treated timber for marine structures, but many species have not been evaluated for their potential for use in this environment. EN 275 specifies a 5-year test period - too long a period for screening tests to be economically viable. In this study, candidate timber species were selected for testing both in the laboratory...
J R Williams, G S Sawyer, G Malyon, S M Cragg, J D Icely, J Simm, M Meaden
Protection mechanisms of modified wood against decay by white and brown rot fungi
2010 - IRG/WP 10-10713
The resistance of beech and pine wood blocks treated with 1,3-dimethylol-4,5-dihydroxyethylene urea (DMDHEU) against T. versicolor and C. puteana increased with increasing WPG. Full protection (mass loss below 3%) was reached at WPGs of approximately 15% (beech) and 10% (pine). Metabolic activity of the fungi in the wood blocks was assessed as heat or energy production determined by isothermal mic...
C Mai, P Verma, Yanjun Xie, J Dyckmans, H Militz
The brown rot of oak wood submerged for 6 months in the Baltic sea
2010 - IRG/WP 10-10736
The natural wood submerged or partially immersed in sea water is commonly affected by certain microorganisms. The bacteria and marine borers that decay the wood totally submerged in sea water and above sea level other microorganisms as fungi, algae, insects may attacked wood. The sea water may affect and change the properties of wood. We have tried to determine the susceptibility to decay caused b...
A Fojutowski, A Kropacz, I Pomian
Decay Resistance of Maple (Acer Insigne) Wood Against White Rot
2010 - IRG/WP 10-10740
In this study, the decay resistance of maple (Acer insigne) in natural state and treated with ACC (Acid copper chromate) was investigated against the white rot fungus (Coriolus versicolor). ACC is a kind of water borne preservatives that was used in this study for treating specimens under vacuum and pressure (Bethell procedure) with 3 percent concentration. In conducting mentioned evaluation, koll...
V Tazakor Rezaei
Diagnosis of failures in wood beams from historical house in Banská Štiavnica – Relations between ultrasonic measurements and bending properties
2010 - IRG/WP 10-20437
Various degrees of rot and other damages in ceiling beams with dimensions of 6500-8800 x 160-200 x 240-310 mm (length x height x width) situated in one historical bourgeois house in the UNESCO town Banská Štiavnica, Slovakia were determined visually and by the PUNDIT-plus ultrasonic device. Subsequently, for seventeen of the most bio-damaged fir (Abies alba Mill.) beams chosen for exchange were ...
L Reinprecht, M Pánek
Synthesis of novelty borate compounds for wood preservatives: Laboratory test of leachability and decay resistance
2010 - IRG/WP 10-30520
A novel series of ammonium tetraphenylborate (ATB) and borate chemical compounds (BBC) were synthesized as wood preservatives. The leaching rates and decay resistance of boron formulations containing ATB and BBC were conducted. The laboratory leaching results showed that boron leaching rate of treated wood by ATB formulations was from 2.1% - 6.7%, while that of BBC formulations from 23.3% -59.0%. ...
Zhiqiang Li, Mingliang Jiang, Xingxia Ma
Biological performance of wood treated with tar-oil recovered during slow pyrolysis of macadamia nut shells
2010 - IRG/WP 10-30523
This study evaluated decay and termite resistance of wood treated with tar oil obtained from a commercial pyrolysis process of macadamia nut shells. Vacuum-treated pine wood specimens were subjected to various brown and white rot fungi based on the soil-block test method specified by the American Wood Protection Association (AWPA) after leaching process. Treated specimens were also subjected to th...
S Nami Kartal, E Terzi, C Kose, J Hofmeyr, Y Imamura
The Effects of Some Fire Retardant Chemicals on the Decay Resistance of Medium Density Fiberboard (MDF)
2010 - IRG/WP 10-30536
The objective of this study was to determine the decay resistance of Medium Density Fiberboard (MDF) treated with 5% and 10% concentration of various fire retardant (FR) chemicals. Experimental panels were produced using by melamine-urea-formaldehyde (MUF) resins having 10%, 15% and 20% of melamine content. MDF specimens were subjected to decay resistance test performed according to modified EN 11...
D Ustaömer, M Usta, Ü C Yildiz, S Yildiz, E D Tomak
Repairing of wooden elements by beta-method using carbon, steel or beech rods
2010 - IRG/WP 10-40488
Presented paper is focused on repairing of wooden elements by Beta joints reinforced with carbon, steel or beech rods, and on comparing the efficiency of these joints with traditional carpentry joints. In model laboratory experiments have been determined the bending strength (fm) and the modulus of elasticity (E) of control or original elements (fm-Control; Eo) from Norway spruce (Picea abies Kars...
L Reinprecht
Study on the thickness swelling of mould-resistant chemical treated bamboo strand woven outdoor flooring
2010 - IRG/WP 10-40489
To prevent bamboo strand woven flooring from mould, several preservatives were chosen to treat bamboo strand before dipping into adhesives and pressing. The thickness swelling and mould resistant effect of the finished board were studied. Results showed that different preservatives had different influences on the thickness swelling of BSWF, and in order to reduce the thickness swelling of the fini...
Fangli Sun, Binfu Bao, Shenyuan Fu, Anliang Chen
Fungal decay resistance and mechanical properties of plywood panels made from maritime pine (Pinus pinaster) and bonded with cornstarch-quebracho tannin-phenol formaldehyde adhesive
2010 - IRG/WP 10-40490
The aim of this work is to demonstrate the performances of cornstarch-quebracho tannin-based resins designed as adhesive in the plywood production. In this way, the cornstarch and quebracho tannin was introduced in the classic adhesive formulation in order to supply a part of phenol-formaldehyde (PF). In order to evaluate the mechanical performances of optimal cornstarch-quebracho tannin-PF, plywo...
F Charrier, A Moubarik, A Allal, A Pizzi, B Charrier
Decay and termite resistance of particleboard and MDF panels made from pinecones
2010 - IRG/WP 10-40493
Particleboard and medium density fiberboard (MDF) panels were produced by using pinecone from stone pine (Pinus pinea L.) tress and wood particles from pine and beech wood at various ratios. Specimens from the panels were subjected to slightly modified soil-block tests according to AWPA E10-06 standard method by using two brown-rot fungi, Gloeophyllum trabeum and Postia placenta and two white rot ...
C Köse, E Terzi, Ü Büyüksar, Erkan Avcı, Nadir Ayrılmış, S Nami Kartal, Y Imamura
Hydrothermal modification for upgrading the durability properties of soft deciduous wood
2010 - IRG/WP 10-40494
To extend the application potentialities of soft deciduous wood, upgrading the durability properties, hydrothermal modification (HTM) of aspen alder and birch wood was investigated. The treatment was conducted in a multifunctional laboratory device WTT. In the previous cases it has been found that the treatment at 160oC improves the durability insufficiently. The modification at 180oC ensured a hi...
B Andersons, I Andersone, V Biziks, I Irbe, J Chirkova, E Sansonetti, J Grinins, H Militz
TMT–Interlab–Test to establish suitable quality control techniques - Structure and first results
2010 - IRG/WP 10-40503
As a result of growing quality demands from manufacturers and end-consumers of thermally modified timber (TMT) recent scientific research activities are increasingly focussed on modification mechanisms and by this on the development of suitable quality control methods. To deepen the knowledge in modification mechanisms and to obtain a larger variety of scientific data for TMT depending on the trea...
C R Welzbacher
Testing of decay resistance of sapwood and heartwood of thermally modified Scots pine and Norway spruce
2010 - IRG/WP 10-40523
Thermal modification at elevated temperatures changes the chemical, biological and physical properties of wood. One of the main targets of thermal modification is to increase the biological durability and decay resistance of wood. Although the effects of thermal modification on wood have been widely studied, the significance of sapwood and heartwood on the resistance of thermally modified wood has...
H Viitanen, S Metsä-Kortelainen
Effect of Coatings on the Durability of Birch and Spruce Plywood. Part 1: Weathering Performance
2010 - IRG/WP 10-40526
Several different coated birch and spruce plywood types were investigated in Finland using outdoor weathering. The weather performance of the tested coated birch plywood was good compared with uncoated birch and spruce plywood. The paint base film coated and painted birch plywood performed well in outdoor testing at VTT's test site. Phenol film coated plywood was sensitive to UV light, but on...
A Nurmi, H Viitanen
Effect of Nano-Silver Treatment on Densified Wood Properties. Part One: Swelling, Recovery Set, Bending Strength
2010 - IRG/WP 10-40533
In this research the effect of Nano-Silver treatment on compressed wood properties, was studied. Wood specimens were cut from Popolus alba (poplar) and impregnated with Nano-Silver and water. Then the saturated samples were compressed through radial direction in a hot press under pressure of 6 MPa, for 1 and 4 hours. The temperatures of press were 150°C and 175°C. Swelling (24h), recovery set ...
G Rassam, H Reza Taghiyari, B Jamnani, M Ali Khaje
Biological resistance of acetylated particleboards exposed to white (Trametes versicolor (and brown (Coniophora puteana) rot fungi
2010 - IRG/WP 10-40534
This research was conducted to investigate the effect of acetylation on bioresistance of particleboard produced from acetylated wood chips of Fagus orientalis exposed to white (Trametes versicolor (and brown (Coniophora puteana) rot fungi. After 12 hours soaking in acetic anhydride, in order to achieve three level of weight gains, 5, 9 and 16%, acetylated particles were heated in an oven at 120 c...
M Ghorbani kokandeh, K Doosthoseini, A N Karimi, B Mohebby, H Asghari
Termite Resistance of Different Wood Panels Treated with Bifex® under Laboratory and Field Trials
2011 - IRG/WP 11-10745
The effects of Biflex® on termite resistance of laminated chip Board, MDF (Medium Density Fiber), Ply Wood and Veen Board at 50 ppm were evaluated. Laboratory and field trials resistance tests showed that all woods treated with Biflex were resistant to termites as compared to untreated ones. It was concluded that as chemical loadings increased, termite mortalities increased, and at the same time...
F Manzoor, S A Malik, B M Ahmed Shiday, A Liaquat, N Naz
Decay resistance attributes of teak (Tectona grandis L. f.) wood: comparison of the fungicidal activities of quinones
2011 - IRG/WP 11-10752
The implication of quinones in decay resistance of teak wood is controversial. To better understand the role of individual quinone in this property, we studied the correlations between this latter and the content of 2-(hydroxymethyl)anthraquinone, tectoquinone, anthraquinone-2-carboxylic acid, 1,4-naphthoquinone, lapachol and the new compound 4’,5’-dihydroxy-epiisocatalponol found in teak wood...
F B Niamké, N Amusant, N Lemenager, G Chaix, M-F Thévenon, C Baudassé, S Kati-Coulibaly, A Amissa Adima, I Gossan Ado, C Jay-Allemand
Quantitative design guideline for wood outdoors above ground applications
2011 - IRG/WP 11-20465
This paper describes the background and principles behind an engineering design guideline for wood in outdoor above ground applications, i.e. use class 3 according to EN 335. The guideline has been developed in the European research project WoodExter and can be seen as a first prototype for a quantitative design tool in the area of wood durability. It is based on a defined limit state for onset of...
S Thelandersson, T Isaksson, E Suttie, E Frühwald, T Toratti, G Grüll, H Viitanen, J Jermer
Characterisation and evaluation of various chitosan oligomers, and decay resistance
2011 - IRG/WP 11-30562
Chitosan, a polymer of D-glucosamine, is known for its antimicrobial activity. However, the physicochemical properties of chitosan depend upon three principal factors, i.e. source of raw material, molecular weight and degree of deacetylation. Here, we report synthesis and characterization of chitosan oligomers prepared by deaminative depolymerization of chitosan (s) obtained from Sigma Aldrich and...
I Hussain, C Chittenden, T Singh
Termite resistance of timber envelope treated with imidacloprid then modified by typical building site operations
2011 - IRG/WP 11-30570
Imidacloprid is a new envelope insecticide approved by Australian regulatory authorities for framing timber. It is a non repellent insecticide. Results are reported for timber envelope treated with imidacloprid and altered post treatment with typical building site operations to expose untreated surfaces. These modifications included, cutting, notching and drilling. Pinus radiata timber samples w...
K Day, A Siraa, P Lobb
The resistance to Basidiomycetes fungi of chipboard 35 years after their industrial preservation with wood preservative on fluoroborate basis
2011 - IRG/WP 11-40546
The research on wood-based panels’ (WBP) behaviour towards fungi impact demonstrated rather low resistance of wood-based materials to wood rotting fungi. However, these materials are used in construction under conditions favourable to fungi growth. In such conditions WBP treated with wood preservatives should be used. Preservation durability is of great importance in such cases. The resistance o...
A Fojutowski, A Kropacz