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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Haller, Peer
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Topics
Publications (16/16 displayed)
- 2024Investigations on the thermo-mechanical behaviour of densified veneer wood for cryogenic applicationscitations
- 2023Impregnation of wood with a paraffinic phase change material for increasing heat capacitycitations
- 2023Bending tests of delignified and densified poplarcitations
- 2022Impregnation of Wood with a Paraffinic Phase Change Material for Increasing Heat Capacity
- 2022Bending tests of delignified and densified polar
- 2018Studies on non-metallic mechanical joints for engineered timber constructions
- 2018Mechanically and biologically properties of densified and thermally modified wood for outdoor applications - hardness, bending strength, durability and resistance
- 2018Non-metallic Slot-in-plate Type Connections for Timber Trussed Girders
- 2014Investigations on the recovery behaviour of beech (Fagus sylvatica) wood densified transverse to the grain
- 2014Application of moulded wooden tubes as structural elements
- 2014Glasfaserverstärkte Holzrohre für Kleinwindkraftanlagen
- 2014Recent advancements for the application of moulded wooden tubes as structural elements
- 2014Advancements for the Structural Application of Fiber-Reinforced Moulded Wooden Tubescitations
- 2013Formholzrohre - Stand der Forschung und Anwendungencitations
- 2013Continuous Wood Densification Process of Circular Profiles
- 2011Hochleistungsholztragwerke - HHT- Entwicklung von hochbelastbaren Verbundbauweisen im Holzbau mit faserverstärkten Kunststoffen, technischen Textilien und Formpressholz
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article
Bending tests of delignified and densified poplar
Abstract
Wood modification has a long tradition to improve durability and other properties. In this study, a combination of delignification and densification to enhance bending strength and ASE (antiswelling efficiency) was introduced. Both treatments change the properties of modified wood in different ways depending on the conditions and species. The objective of this treatment combination was the improvement of mechanical properties by partly extracting lignin. The treated structure retains the alignment of cellulose and hemicellulose chains. The densification perpendicular to the grain reduced the cell lumina and compressed the wood structure by more than 70%. As a result, the cell walls become decreased entangled and new hydrogen bonds between adjacent cellulose nanofibres were linked. The combined processes were applied to the green and dried poplar (Populus nigra L.). Firstly: the delignification procedure was done with small specimens in NaOH and Na2SO3 solution at 100 degrees C, 130 degrees C or 150 degrees C for 7 h. After washing and analysing wood components densification followed. The wood was compressed 80% perpendicular to the grain in different temperatures (100 degrees C, 130 degrees C, 160 degrees C) and pressing times (4, 20, 24 h) of the original thickness. After the treatment, ASE and bending strength (MoR, MoE) were determined. The bending strength was meanly dependent on the solution temperature and compression time and temperature. Bending strength will increase up to 450 MPa and has the optimum at around 90% lignin removal and 130 degrees C pressing time over 24 h. ASE was reduced by strong delignification and increasing temperature.