Your search resulted in 136 documents. Displaying 25 entries per page.
Performance of boron diffused wood products used indoors for 144 months in Bangladesh
2012 - IRG/WP 12-30581
In this service performance study of boron diffused hardwoods, boron in the form of boric acid (H3BO3) was applied separately through paste and through wet cloth. The born diffused woods were kept indoors for 144-months in Bangladesh to ascertain the performance of treated wood against wood destroying insects. The new easy application processes of cost effectual boric acid have been found effectiv...
A K Lahiry, T Lahiry
Experiences with an industrial system for controlled thermal wood modification in pressurized unsaturated steam
2014 - IRG/WP 14-40678
Thermal wood modification in pressurized reactors has a long history, but these processes are to date industrially scarcely used, because of the relatively complicated process equipment, compared to the more common high-temperature processes in kilns at atmospheric pressure. However, based on our practical experience with the FirmoLin® process, supported by recent scientific findings, it is foun...
W Willems
Steam accelerated borate diffusion: Optimizing dry tie treatment
2015 - IRG/WP 15-40713
A small laboratory study was carried out which demonstrated that dry wood dip treated in a high concentration borate solution could not be subsequently treated properly with oil borne copper naphthenate unless it was subsequently steam treated to accelerate borate penetration into the wood and re-dry the wood beforehand. A larger study with commercial sized cross ties (railway sleepers) was carri...
J-W Kim, J D Lloyd
The sorption behaviour of wood
2017 - IRG/WP 17-20605
The use of dynamic vapour sorption to determine the sorption properties of wood has become an increasingly popular technique. The method has many advantages when compared with many other gravimetric methods. However, it is necessary to set an equilibrium condition in order to obtain data for an isotherm in a reasonable amount of time. An important recent finding has been that multiple sorption cyc...
C Hill
Boron dual-treatments for Douglas-fir utility poles: Tracking boron migration over time
2019 - IRG/WP 19-30739
The potential for using boron pressure-treatment prior to over-treatment with conventional, heavy-duty wood preservatives to limit internal decay in-service was investigated in two field tests on Douglas-fir utility poles. Pole sections were pressure-treated with disodium octaborate tetrahydrate (DOT) and then over-treated with either pentachlorophenol or copper naphthenate in oil. Alternatively, ...
J Cappellazzi, M J Konkler, J J Morrell
Wood Protection Through Diffusion: Dimensional Stabilisation with Amine Oxides
2019 - IRG/WP 19-30747
Wood is a phenomenal construction material. In addition to its great physical properties and its beautiful appearance, it possesses many environmental-friendly virtues like the sequestration of carbon dioxide. It is however subject to dimension changes when submitted to fluctuating moistures levels, which can lead to warps, cracks and the peeling of paints. Many water repellents can slow down the ...
S Pepin, P Blanchet, V Landry
Limiting Polysaccharide Motion Protects Wood From Decay
2020 - IRG/WP 20-40890
It is well known that chemical modifications to improve decay resistance also reduce the equilibrium moisture content (EMC) of wood. The mechanism of this action, however, has been the subject of much debate. Several groups have suggested that decay resistance is a result of lower diffusion rates of fungal degradation agents through the wood cell wall. A recent paper explained the fundamental prin...
C G Hunt, S L Zelinka, J E Jakes
Application of suberin fatty acids extracted from birch bark for wood coating
2021 - IRG/WP 21-40914
It is well known that chemical modifications to improve decay resistance also reduce the equilibrium moisture content (EMC) of wood. The mechanism of this action, however, has been the subject of much debate. Several groups have suggested that decay resistance is a result of lower diffusion rates of fungal degradation agents through the wood cell wall. A recent paper explained the fundamental prin...
A Kumar, Risto Korpinen, Veikko Möttönen
Significance of the thermal design and the sorption isotherm shape in hygroscopic wood moisture dynamics and service life
2022 - IRG/WP 22-20682
Moisture dynamics are considered important for predicting the service performance of wood in exterior applications. Above a critical moisture content, water acts a softener on the structural polymer matrix of the wood cell wall, enabling the necessary diffusion of molecular species involved in the fungal degradation mechanism of wood. Water may enter solid wood in either liquid form or in vapor fo...
W Willems
Preservative Treatment of CLT: An Example at Shimojishima Airport
2019 - IRG/WP 19-30748
Cross laminated timber (CLT) is a relatively new construction method that allows multi-storey construction using solid wood instead of concrete or steel. It is a method favoured by progressive architects and recognized for its much lower environmental footprint. Wood is an excellent construction material and is a long-term carbon sink that also performs well in the event of earthquakes and fire....
J Lloyd, N Yamashita, A Taylor
Moisture sorption behaviour of poplar and thermally modified poplar using dynamic vapour sorption (DVS)
2022 - IRG/WP 22-40947
The moisture sorption behaviour of wood has a critical impact on service life. In Europe, softwood is mostly used to manufacture engineered wood products such as cross-laminated timber (CLT) or glue-laminated timber (GLT or glulam). Yet fast-growing and widespread tree species such as hybrid poplar with or without modification, have potential to meet the increasing demand. This study shows the moi...
X Jiang, J Van den Bulcke, L De Boever, M Minsart, A Mignon, J Van Acker