Resistance of mechanically densified and thermally post-treated pine sapwood to wood decay fungi

Pelit, Hüseyin; Yalçın, Mesut

doi:10.1007/s10086-017-1641-4

Cited by 14 publications

(12 citation statements)

References 35 publications

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“…The decrease in hardness can be attributed to the degradation of polysaccharides and the loss of mass (Pelit et al 2017). The total cellulose and hemicellulose content decreased with an increase in temperature and duration of treatment.…”

Section: Radial Hardness Analysismentioning

confidence: 99%

Effects of thermo-hydro-mechanical treatments on various physical and mechanical properties of poplar (Populus) wood

Shao

Chen

et al. 2020

BioRes

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Poplar (Populus) wood was subjected in this work to thermo-hydro-mechanical treatment. The influence of the treatment parameters on the physical and mechanical properties were investigated. The wood samples were densified under three compression ratios (0%, 30%, and 50%), and thermally treated at three temperatures (180 °C, 200 °C, and 220 °C), at three thermal treatment durations (3 h, 4 h, and 5 h). The density, modulus of elasticity, modulus of rupture, radial hardness, and thickness swelling were measured. The results showed that the densities of the samples increased by 36.6% to 49.7%. As the compression rate increased, the temperature, duration, modulus of elasticity, modulus of rupture, and hardness increased. However, the dimensions of the densified samples were less stable. Compared to the densiﬁed samples, the maximum thickness swelling could be reduced by 74% (from 29.7% to 7.8%) when subjected to a thermal treatment at 220 °C for 3 h.

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Section: Radial Hardness Analysismentioning

confidence: 99%

Effects of thermo-hydro-mechanical treatments on various physical and mechanical properties of poplar (Populus) wood

Shao

Chen

et al. 2020

BioRes

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“…Densification is a process that has been extensively used to improve the properties of wood through heating and compressing. During this process, the wood is deformed as its volume decreases, followed by an increase in its density and specific gravity [1][2][3][4]. Various processes have been attempted and shown to improve the physical and mechanical properties of densified wood [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Effect of Sodium Hydroxide, Succinic Acid and Their Combination on Densified Wood Properties

Augustina

Wahyudi

Dwianto

et al. 2022

Forests

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The effect of NaOH, succinic acid and their combination used as pretreatments on selected properties of densified wood samples of pisang putih (Mezzettia spp.), nyatoh (Palaquium spp.) and sepetir (Sindora spp.) has been studied. The properties of these samples were then compared with those of untreated wood (control) and densified wood samples without any pretreatment (HD wood). For alkali-pretreatment, after immersion in 10% NaOH (w/w) for 1, 2 and 3 h, the samples were immediately compressed; for acid-pretreatment, the sample was impregnated with 10% succinic acid (w/w) using a vacuum of −50 kPa for 30 min and a pressure of 7 bar for 2 h before pressing; while for the combination-pretreatment, the sample was initially immersed in 10% NaOH then impregnated with 10% succinic acid (w/w) and finally densified/compressed. Compression was applied in a radial direction and carried out in an open system using a hot press machine at 180 °C and 7 MPa specific pressure for 30 min with a 40% compression ratio. The results showed that densified wood with or without pretreatment had a higher specific gravity (SG) than the control, whereas sepetir wood showed the greatest increase in SG. The alkali- and combination-pretreatments resulted in a higher C-set value than in the control, HD and acid-pretreated samples. Acid-pretreatment resulted in the best improvement in dimensional stability compared to the other pretreatments. Increasing the immersion time in NaOH solution was proven to be able to increase dimensional stability both in alkali- and combination-pretreatments, although water absorption values varied.

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“…There are several advantages of the use of THM treatments as wood treatment processes. For example, resistance to decay is improved by application of high temperatures [11], which has been largely employed for thermally treated wood [12,13]. The treated wood presents enhanced hygroscopicity due to the degradation of hemicellulose; a process that reduces the water absorption of wood [14] where effects are species-dependent according to the chemical composition of the timber [15].…”

Section: Introductionmentioning

confidence: 99%

Wood Properties Characterisation of Thermo-Hydro Mechanical Treated Plantation and Native Tasmanian Timber Species

Balasso

Kutnar

Niemelä³

et al. 2020

Forests

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Thermo-hydro mechanical (THM) treatments and thermo-treatments are used to improve the properties of wood species and enhance their uses without the application of chemicals. This work investigates and compares the effects of THM treatments on three timber species from Tasmania, Australia; plantation fibre-grown shining gum (Eucalyptus nitens H. Deane and Maiden), plantation saw-log radiata pine (Pinus radiata D. Don) and native-grown saw-log timber of the common name Tasmanian oak (which can be any of E. regnans F. Muell, E. obliqua L’Hér and E. delegatensis L’Hér). Thin lamellae were compressed by means of THM treatment from 8 mm to a target final thickness of 5 mm to investigate the suitability for using THM-treated lamellas in engineered wood products. The springback, mass loss, set-recovery after soaking, dimensional changes, mechanical properties, and Brinell hardness were used to evaluate the effects of the treatment on the properties of the species. The results show a marked increase in density for all three species, with the largest increase presented by E. nitens (+53%) and the smallest by Tasmanian oak (+41%). E. nitens displayed improvements both in stiffness and strength, while stiffness decreased in P. radiata samples and strength in Tasmanian oak samples. E. nitens also displayed the largest improvement in hardness (+94%) with respect to untreated samples. P. radiata presented the largest springback whilst having the least mass loss. E. nitens and Tasmanian oak showed similar dimensional changes, whilst P. radiata timber had the largest thickness swelling and set-recovery due to the high water absorption (99%). This study reported the effects of THM treatments in less-known and commercially important timber species, demonstrating that the wood properties of a fibre-grown timber can be improved through the treatments, potentially increasing the utilisation of E. nitens for structural and higher quality timber applications.

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Resistance of mechanically densified and thermally post-treated pine sapwood to wood decay fungi

Cited by 14 publications

References 35 publications

Effects of thermo-hydro-mechanical treatments on various physical and mechanical properties of poplar (Populus) wood

Effects of thermo-hydro-mechanical treatments on various physical and mechanical properties of poplar (Populus) wood

Effect of Sodium Hydroxide, Succinic Acid and Their Combination on Densified Wood Properties

Wood Properties Characterisation of Thermo-Hydro Mechanical Treated Plantation and Native Tasmanian Timber Species

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