Your search resulted in 866 documents. Displaying 25 entries per page.
Durability of timber products – Part 2: Proposal for an IRGWP - Durability Database
2012 - IRG/WP 12-20497
A proposal for a web-based platform for scientific exchange of test data in the field of wood durability and wood protection has been made. The overall aim of the durability data base is to improve the usability of existing test data and to create an added value for durability research and service life prediction.
The database allows for test results from standardized and non-standardized laborat...
C Brischke, L Meyer, G Alfredsen, M Humar, L Francis
Testing service life for use class 3: accelerated L-joint performance of commodities
2012 - IRG/WP 12-20500
Above ground testing is considered important for the assessment of treated wood intended for use class 3. Laboratory testing of efficacy of biocides as well as of natural durability focussing on such applications has to be linked to performance and service life. An accelerated L-joint test was some 15 years ago developed at the Ghent University to allow worst case assessment under semi-controlled ...
J Van Acker, J Van den Bulcke, I De Windt, L De Vetter
Mold Control for Treated Lumber in Block-Stack Storage Conditions
2012 - IRG/WP 12-30588
The mold development and control for freshly treated and block-stacked wood have been evaluated using a green house mold testing method. The results for the mold resistance of several commonly used water boron preservative treatment systems, such as ACQ, Copper Azole, and borates with and without inclusion of mold inhibitors are presented. The data suggest that the different preservative treatme...
L Jin, P Walcheski, A Preston
Glueline fungicides in veneer based engineered wood products - results from laboratory work for the H1.2 hazard class in New Zealand
2012 - IRG/WP 12-30593
The use of glueline insecticides in plywood and laminated veneer lumber is commonplace in several countries. However, few glueline fungicides are registered for commercial use with previous work suggesting that achieving control of decay from the glueline is very challenging. This paper summarises two tests completed on Pinus radiata plywood with a new glueline fungicide comprising the active in...
A Siraa, K Day, P Lobb
Durability of Furfurylated Wood – Results from Laboratory and Field Tests in the Ecobinders project
2012 - IRG/WP 12-40602
Within the EU project Ecobinders, laboratory tests were performed with furfurylated wood produced in semi-industrial scale in the factory of Kebony ASA. Field trials in Horizontal double layer decks and in-ground of transmission poles were also started. Four wood species, Southern yellow pine (SYP), maple, beech and aspen were treated to two treatment levels by using two impregnating liquids with ...
M Westin
Nano structural properties of La2O3-Beech Wood Flour With XRD technique
2012 - IRG/WP 12-40607
This research was considered to study various properties of the Lanthana mixed with beech wood flour (BWF), as a new structure. For this purpose, La2O3 powders in the BWF have been obtained by sol-gel method using simultaneous gelation of all cations. La2O3 - BW samples are analysed by X-ray diffraction .The obtained results showed the formation of nano crystalline La2O3 phases. The average crys...
M Ghorbani Kokandeh, I Bahamni, A Bahari
Field-testing of Norway Spruce Claddings with Monitoring of Moisture Content, Material Temperature and Microclimate
2012 - IRG/WP 12-20502
The physical function of a cladding is to protect the interior construction. Under normal circumstances the performance requirements can be met for a very long time, meaning that the technical service life of a wooden cladding can be very long. Since the cladding is a major part of the facade, it also has visual requirements that may define the aesthetic service life, and often it is much shorter ...
G I Vestøl, L Ross Gobakken
Development of a quality control assessment method to predict properties of heat treated wood
2012 - IRG/WP 12-40611
Heat treatment has been used to improve properties of non durable European species. Chemical modification of some of the wood components provides improved dimensional stability and biological performance against decay fungi while mechanical properties such as modulus of rupture are reduced. Quality control of commercially made thermally treated wood is one of the major challenges to allow its indu...
M Chaouch, K Candelier, S Dumarcay, A Pétrissans, M Pétrissans, P Gérardin
A case study of investigating fungi that affect traditional Japanese shake roof with/without copper plates
2013 - IRG/WP 13-10810
A Japanese traditional shake roof is made from split logs. To keep the roof long, copper (Cu) plates are often inserted between the shakes. It has been thought that Cu elements from copper plates would flow out when a shake roof is exposed to rain and inhibit growth of wood rotting fungi. Actually there are some examples where the Cu plates seem to be effective in preventing fungal damage, but on ...
T Wada, Y Fujiwara, Y Fujii, R Kigawa
Resistance of Consolidated Deteriorated Wood to Wood Decay Fungi
2013 - IRG 13-10812
The main purpose of the experiment was to establish which consolidating products in impregnated wood are the most effective against wood decay fungi. Five different consolidators were tested: Paraloid B-72, Consolidating restaurateur, SG 715 BLANC (epoxy resin), R.712 polyester and the wood consolidant agent containing nano particles, which is still in development.
From the already damaged wood ...
F Pohleven, A Valantič, M Petrič
Quasi-in-situ durability tests on oak timber bridges
2013 - IRG/WP 13-20510
This study aims on developing a method for determination of wood durability on samples taken from real structures in service. Therefore quasi-in-situ durability tests have been conducted exemplarily on timber bridges made from English oak (Quercus robur L.). Drilling cores were found to be a feasible alternative to standard specimens for laboratory durability tests against pure cultures of Basidio...
C Brischke, C J Behnen, M-T Lenz, K Brandt, E Melcher
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
Statistical analysis of durability tests - Part 2: Principles of time-to-failure and application on field test data
2013 - IRG/WP 13-20512
Service life prediction is an important topic in wood research, especially with regard to the Construction Products Regulation (CPR). Both laboratory tests as well as in-service performance testing is therefore essential, in combination with proper monitoring and analysis tools. A crucial concept is variability and the incorporation of variability in tests and analysis. In this paper we focus on t...
J Van den Bulcke, I De Windt, C Brischke, C R Welzbacher, A O Rapp, J Van Acker
Testing the performance of timber using 27 different field test methods
2013 - IRG/WP 13-20517
Numerous test methods to determine the durability of timber and timber products have been described in relevant literature. However, only some of these methods have been standardized and thus only very few are regularly used for resistance tests in the field. Since results from extensive comparative field studies have shown differences in moisture performance between different test methods, the ai...
L Meyer, C Brischke, J Rieken
Image analysis for mould and sapstain detection on wood
2013 - IRG/WP 13-20519
Laboratory tests for mould growth on wood products are time consuming and rely on visual assessments of specimens utilizing subjective rating systems. Accelerated laboratory methods are needed that can provide rapid, quantitative assessment of mould and sapstain growth on solid and composite wood products. Image analysis of scanned spore imprints from southern pine or oriented strandboard (OSB) sp...
C A Clausen, V W Yang
Accelerated H3 above-ground decay testing
2013 - IRG/WP 13-20520
An above-ground H3 fungal field trial was installed at two sites in Australia and one in New Zealand, as well as in two Accelerated Field Simulators. The aim was to find a method that would shorten the time required for evaluating new preservatives and protection systems. One-quarter H3 retentions were installed, as first results suitable for registration occur when these reach 70% soundness. Twel...
L J Cookson, D Page, T Singh
Visual Inspection – How Important is the Influence of the Evaluator?
2013 - IRG/WP 13-20521
Visual inspection is often a crucial means of judging the efficacy and performance of a preservative. It is used in non-destructive testing in long term exposure trials or simply, when the practical use and precision of the human eye is a good means of measure. As for the procedure described in EN 252, the impression of softness due to decay of the wood has also to be considered. Although, a thumb...
M Klamer, P Larsson Brelid, I Stephan
Virulence of two Laboratory Test Strains and one Natural Isolate of Rhodonia (Oligoporus) placenta against Thermally Modified Pine and Beech Wood
2013 - IRG/WP 13-20524
Rhodonia (Oligoporus) placenta is known as a relative aggressive basidiomycete fungus against thermally modified timber. In durability lab tests, this often results in a lower durability class, compared to other test fungi. In the reported work, the virulence of three different strains of Rhodonia placenta for untreated and thermally modified timber was determined and compared. Therefore, two lab ...
K Plaschkies, W Scheiding, K Jacobs, N Rangno
Method for determining the critical moisture level for mould growth on building materials
2013 - IRG/WP 13-20530
The natural conditions of relative humidity (RH) and temperature (T) in different parts of a building is rarely constant over time. Instead, RH and T often vary cyclically and may pose a risk of mould growth as these conditions are the two key environmental parameters that controls mould growth. Consideration to both humidity and temperature conditions and the susceptibility to mould in a material...
A Ekstrand-Tobin, P Johansson, G Bok
Development of a rapid method to assess the rate of fungal colonization of wood
2013 - IRG/WP 13-20531
Testing of wood durability is today done mainly with accelerated exposure tests under rather realistic conditions (in ground, outdoors with moisture traps etc). Although such tests are accelerated with respect to the conditions that outdoor exposed wood structures are exposed to, they tend to take rather long time. The present paper presents the development of a rapid method intended to assess at ...
L Wadsö
Report on COST E37 Round Robin Tests – Comparison of results from laboratory and field tests
2013 - IRG/WP 13-20535
A round robin involving 15 European participants was set up in 2006. The round robin consists of both a field test according to the double layer test method and a laboratory test with two different preconditioning methods. When comparing EN 84 preconditioning (two weeks water leaching) with natural preconditioning (1 year in field, above ground) according to CEN/TS 15397, no significant difference...
M Westin, E Conti, J Creemers, P-O Flæte, A Gellerich, I Irbe, M Klamer, B Mazela, E Melcher, R Möller, L Nunes, S Palanti, L Reinprecht, E Suttie, H Viitanen
Micronized Copper Wood Preservatives: Strong Indications of the Reservoir Effect
2013 - IRG/WP 13-30609
Micronized copper wood preservative systems were launched commercially in May 2006. Now, over 75% of the residential lumber produced in the USA is treated with micronized wood preservative formulations. Although considered controversial at first, the mode of action of micronized copper has been clearly defined by multiple authors over the years, as well as a need for a co-biocide in water-borne sy...
M H Freeman, C R McIntyre
Performance testing of DMDHEU-modified wood in Australia
2013 - IRG/WP 13-30613
Chemical wood modification with dimethyloldihydroxy-ethyleneurea (DMDHEU) or its derivatives has been researched for many years and shown to be applicable to improve certain wood properties to both solid lumber and wood-based composites. Earlier research proved a high biological resistance of DMDHEU-modified wood against biological degradation in laboratory and field tests in Europe. Due to the ve...
H Militz, J Norton
Preliminary testing of spiroborate esters as wood preservatives
2013 - IRG/WP 13-30614
Fungicide and insecticide properties of boric acid are known since 30’s of the last century, but high solubility and leachability of inorganic borates limit their use for only applications not directly exposed to liquid water. A number of attempts were made to fixate borate salts into the wood structure but this research topic is still up to date and undiscovered. Water insoluble organoboron est...
D Panov, N Terziev
Performance of Coatings on Wood Treated with Carbon-Based Preservatives
2013 - IRG/WP 13-40638
Wood treated with carbon-based preservatives is often used in applications where coatings are required, yet few studies have examined the effect of such treatment on coating performance. Users need to be confident that coatings on carbon-based preservative-treated wood will perform as well as or better than those on untreated wood. The present study examines the performance of three coatings on un...
R Stirling, P I Morris