Your search resulted in 378 documents. Displaying 25 entries per page.
Understanding of the effect of ancestral and natural saltwater treatment on durability, fibers densification and chemical modification of palm wood
2018 - IRG/WP 18-10921
The palm-tree sector plays a very important role on both the socioeconomic and ecological levels, in Tunisia. There are three million trees in Tunisian palm plantations, ensuring a potential significant wood production, mainly in the craft and furniture industries.
In the past, Date Palm wood (Phoenix dactylifera L.,) was also used as structural material. Its low natural durability and its low m...
M T Elaieb, A Namsi, M Tella, M-F Thévenon, K Chandelier
Study of the effect of extractives on the natural durability of Eucalyptus bosistoana wood
2018 - IRG/WP 18-10928
Wood as a natural material is degradable both by biotic deterioration agents (fungi, bacteria, marine borers, insects) and abiotic (UV and IR radiation, moisture, fire, etc.). The inherent resistance to the attack of the deteriorating agents is defined as the natural durability of the wood. This is an important property when considering the shelf life of wood products exposed to extreme conditions...
M Ibáñez, C Mantero, N Silva, F Resquín
Evaluation of the effect of zwitterionic buffers on termite gut protists
2018 - IRG/WP 18-10933
The thermal modification of wood is recognized as the most commercialized wood modification process. The treatment of wood at temperatures usually greater than 180 ºC results in a product with some properties enhanced (dimensional stability, durability, aesthetical colour) and some diminished (mechanical properties). The loss of mechanical strength is recognized as a limitation to the use of ther...
S Duarte, D Jones, L Nunes
Performance of wood decking after 5 years of exposure: verification of the combined effect of wetting ability and durability
2019 - IRG/WP 19-20647
Wood is one of the most important construction materials and its use in building applications has further expanded in recent decades. In order to enable even more extensive and reliable use of wood, factors affecting wood’s service life need to be understood. More recently, a new concept to characterize the durability of wood-based materials and to predict the service lives of wood was proposed,...
M Humar, D Krzisnik, B Lesar, C Brischke
Quantifying the effect of microclimatic parameters on the moisture-induced decay risk of wooden structures
2019 - IRG/WP 19-20649
Wood exposed outdoors is prone to fungal degradation. Besides its material-inherent resistance, numerous factors are impacting on its service life with both, climate and design having a major effect. In addition, topography, shading, wind barriers, and other local parameters have an effect on the microclimatic conditions at site and therefore need to be quantified for service life prediction of wo...
L Emmerich, C Brischke
Biocidic effect of nano metal fluorides against brown-rot fungi
2019 - IRG/WP 19-30732
Metal fluoride nanoparticles are promising because of their low water solubility, which reduces the need for fixatives required in widely used active ingredients in wood preservatives such as copper and boron. The effectiveness of nano metal fluorides was compared to sodium fluoride treated wood samples. Wood specimens treated with homo-dispersed sols of MgF2 and CaF2 were tested against brown-rot...
S M Usmani, K Klutzny, I Stephan, E Kemnitz
Effect ofNano-Copper Oxide on Decay Resistance of Pistachio Twig-Plastic Composite
2019 - IRG/WP 19-30750
The goal of our study was to investigate the decay resistance of pistachio twig-plastic composite treated with nano-copper oxide against the white rot fungus Trametes versicoloer and the brown rot fungus Coniophora puteana. For this purpose, wood–polypropylene composites (WPCs) containing different loadings of nano-copper oxide, namely 0, 1, 2 and 3 percent (W/W), were made from pistachio (Pista...
M R M Farahani,S Pourabdollah
Effect of damage to polyurea coatings on metal losses from ammoniacal copper zinc arsenate treated Douglas-fir pile sections
2019 - IRG/WP 19-40867
Metal-based preservatives remain the most widely used treatments for protecting wood in soil or water contact. While these treatments are highly effective, one drawback is a tendency for small amounts of metal to migrate into the surrounding environment. The greatest risk in this regard is copper because many organisms are highly sensitive to this metal. While post treatment practices can reduce ...
M J Konkler, J J Morrell
Effect of pretreatment of wood surfaces with a copper monoethanolamine solution on the natural weathering performance of semitransparent stains
2019 - IRG/WP 19-40881
Semitransparent stains for wood products are favored for outdoor applications in Japan because these finishes do not hide the wood grain. However, the photoprotective effects of wood surfaces are low, therefor there is a need to improve the weathering performance. We examined the natural weathering performance of semitransparent stains on wood pretreated with a copper monoethanolamine solution (Cu...
S Isaji, H Shibui, Y Hirabayashi
Wood protection techniques and natural weathering: their effect on aesthetics and preference of people
2019 - IRG/WP 19-50351
Current research successfully contributes to improving wood protection techniques. However, the vast majority of research on preventing degradation of wood ignores a critical aspect of making successful products and processes – user selection of materials, which may largely depend on the aesthetical qualities. Wood treatments change the tactile and visual properties of wood substantially and the...
D Lipovac, M D Burnard, A Sandak, J Sandak
Effect of long-term immersion in fresh and salt water on mould growth on Scots pine (Pinus Sylvestris L.) wood
2020 - IRG/WP 20-10962
Wood exposed outdoors will eventually be degraded by fungi, depending on exposure and material characteristics. Numerous wooden constructions in the Røros municipality have existed since the 17th century, but wood used in recent repairs have decayed faster than expected. Before 1970 timber was mainly transported by log driving or rafting, and the logs were immersed in water for longer or shorter ...
M Sand Austigard, J Mattsson
Effect of MVOC exposure on mycelial growth of wood rotting fungi
2021 - IRG/WP 21-10977
It is well known that wood rotting fungi produce microbial volatile organic compounds (MVOCs) as metabolites. In our previous studies, we have found that some MVOCs produced by wood rotting fungi are common to fungal species tested in the studies, while others are specific to each species. Furthermore, it has been also shown that each wood rotting fungi do not always produce the same type of MVOCs...
S Horikawa, R Konuma, M Yoshida
Effect of a Water Repellent Treatment on Moisture Behavior of Three Australian Hardwoods: A Preliminary Report
2021 - IRG/WP 21-40921
Wood is inherently hygroscopic and will sorb moisture either directly from the atmosphere or via capillary action. Moisture can have marked effects on wood properties and repeated wetting and drying creates dimensional changes that lead to physical damage. Exposure to elevated moisture levels also increases the risk of fungal attack.
Wood preservatives have long been used to minimize the risk of ...
B Hassan, J J Morrell, K Wood
Effect of Heat Treatment on Physical and Mechanical Properties of Oriental Beech Wood (Fagus orientalis L.)
2021 - IRG/WP 21-40923
The present study aims to investigate the influence of heat treatment on physical and mechanical properties of Oriental beech wood (Fagus orientalis Lipsky.). Samples were exposed to temperature levels of 130˚C, 160˚C, and 190˚C for 3, 6, and 9 h. Selected physical and mechanical properties including compression strength parallel to grain, compression strength perpendicular to grain, bending st...
M D Ghalehno, D Chu, B N Sheshkal, M Humar, M Bahmani
The effect of sapwood and heartwood differences on durability of short rotation teak wood
2022 - IRG/WP 22-10991
Short rotation teak has been developed to overcome the limited supply of long rotation teak. The aim of this study was to investigate the effect of sapwood and heartwood differences on durability of short rotation teak. The following basic properties were studied: extractive content, dimensional stability (volumetric swelling and water uptake), decay resistance, and termite resistance. The result...
R Martha, M Mubarok, F O Akong, B George, C Gérardin, S Dumarçay, I S Rahayu, I Batubara, W Darmawan, P Gérardin
Studies into the effect of soil type and soil layer on the in-ground decay of European beech
2022 - IRG/WP 22-20681
In this study, European beech (Fagus sylvatica L.) specimens were exposed to three different soil types; Podsol (Podzol), Braunerde (Cambisol), and Pararendzina (Regosol), in adapted terrestrial microcosm (TMC) tests according to CEN/TS 15083-2 (2005). Soils were sampled (250 mm deep) from field sites and separated into their constituent layers to deliver three TMC setups; mineral soil layer only ...
B N Marais, S Kovacs, M Jansen, C Brischke
Effect of nanoparticle impregnation on the biological durability of wood
2022 - IRG/WP 22-30772
This study evaluated the efficacy of five different nanoparticles (zinc-oxide, zinc-borate, silver, copper-oxide, copper-borate) applied with different concentrations against the brown rot Coniophora puteana and the white rot Coriolus versicolor. The generally effective nanoparticle treatments were the combinations containing borate in its chemical structure. However, only zinc-oxide and silver na...
M Bak, R Németh
Effect of furfurylation treatment on the performance of three Canadian wood species
2022 - IRG/WP 22-40925
The demand for exterior wood siding is stagnating in North America, partly due to the perception of consumers, architects and contractors regarding their durability and maintenance. Improving attributes such as the dimensional stability of wood is therefore necessary to make it more attractive to consumers. This project aims to assess the performance of Canadian species; white spruce (Picea glauca...
G Boivin, D Schorr
Environmentally Friendly Wood Modification based on Tannin-Furfuryl alcohol - Effect on stabilisation, mechanical properties and decay durability
2022 - IRG/WP 22-40929
Furfurylation is a well-known wood modification technology. This paper studied the effect of tannin addition on the wood furfurylation. Three kinds of dicarboxylic acids, adipic acid, succinic acid, and tartaric acid, as well as glyoxal as a comparing agent, were used to catalyse the polymerisation of furanic or tannin-furanic solutions during wood modification. Impregnation of furanic or tannin-f...
M Mubarok, E Azadeh, F O Akong, S Dumarçay, A Pizzi, C Charbonnier-Gérardin, P Gérardin
Effect of nano-particle characteristics and concentration on UV protection of timber: A field exposure test
2022 - IRG/WP 22-40941
Wood has a well-known susceptibility to ultra-violet light degradation, leading to premature replacement. A variety of products have been developed to protect against this damage, but most provide less than 12 months of protection and must be regularly reapplied. Developing improved coatings would help reduce wood losses and reduce maintenance costs. Nano-particles have a variety of attractive pro...
T Yi, J J Morrell
Effect of densification of Eucalyptus nitens and E. obliqua on moisture uptake, swelling, decay resistance, and fire performance
2022 - IRG/WP 22-40946
Some Australian Eucalyptus species that are abundantly available have low natural durability and poor resistance to fire. These same species are also extremely difficult to treat with preservatives or fire retardants using conventional pressure treatment methods due to a large proportion of refractory heartwood. The aim of this research was to understand whether thermo-mechanical densification had...
B Hassan, J J Morrell, F Wiesner, W Wu, B Belleville, K C Wood
Effect of enzymatic inhibitors on the population of Reticulitermes grassei and their associated microbiota
2023 - IRG/WP 23-11008
Termites are pests that invade urban, agricultural and forest environments worldwide. They are economically important owing to the damage they cause to wood, wood products, building materials, agricultural products and forests. There are many methods for its control, but many of them cause negative environmental effects due to their toxicity. In termites, dietary change or antibiotic treatment may...
S M Santos, M T Troya, F Llinares, P Colina, E García, M Álvarez, L Robertson
Effect of volatile organic compounds produced by wood rotting fungi on mycelial growth
2023 - IRG/WP 23-11023
Microorganisms such as fungi or bacteria produce volatile organic compounds (so-called MVOCs: Microbial Volatile Organic Compounds) as metabolites. Some MVOCs have been found to be biologically active, for example inhibition of spore germination, and when fungi of different species encounter each other, the MVOCs pattern change, suggesting that MVOCs play a role as a mediator for biological intera...
S Horikawa, R Konuma, M Yoshida
Effect of Moisture Cycles and Timber Treatment on the Performance of Screwed Connections
2023 - IRG/WP 23-20694
The impact of moisture in timber structures is associated with the deterioration of timber, and loss of mechanical performance. Methods have been developed to treat timber using chemicals to inhibit deterioration, however, water intrusion has much more immediate effects on the mechanical properties of timber associated with swelling and shrinkage of the wood. The effects of moisture on the mechani...
L Yermán, M Xiao, Z Yan, L-M Ottenhaus
Carbon nanotubes and multifunctional silane additive as fillers in PF resin and their effect on the composite flammability
2023 - IRG/WP 23-30783
Adhesive bonds are the most readily modifiable and, at the same time, give the greatest scope for modification of components of lignocellulosic composites. A study of a manufactured lignocellulosic composite based on a phenol-formaldehyde resin and pine veneer with additives modifying the properties of the resin was made. The multifunctional commercial silicon oxide Protectosil 851 and multi-walle...
W L Grzeskowiak, B Mazela, T Prowadzisz