Glulam beam made from hydrothermally treated poplar wood with reduced moisture induced stresses

Mirzaei, Ghaneh; Mohebby, Behbood; Ebrahimi, Ghanbar

doi:10.1016/j.conbuildmat.2016.12.178

Cited by 35 publications

(11 citation statements)

References 20 publications

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“…Densification at 200°C for 4 h without post-treatment reduced the swelling to 34%, analogical to the effect of an oil-heat treatment at 200°C for 4 h independent from the densification parameters. Study by Mirzaei et al [80] also reported that thermal treatment reduced the moisture induced stresses that occur when the glulam was exposed to the changes of moisture and subsequently resulted in shape distortions and, during re-drying process, led to cracks on the surface. Therefore, glulam made from the thermally treated poplar wood had lower moisture induced stresses owing to its reduced hygroscopicity and showed better bending strength and stiffness.…”

Section: Dimensional Stabilitymentioning

confidence: 98%

Thermal treatment of wood using vegetable oils: A review

Lee

Zaidon

Lum

et al. 2018

Construction and Building Materials

130

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Section: Dimensional Stabilitymentioning

confidence: 98%

Thermal treatment of wood using vegetable oils: A review

Lee

Zaidon

Lum

et al. 2018

Construction and Building Materials

130

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“…The least hygroscopic materials were 160/0.8/WTT and 217/3.0/TV. It is commonly known that hydrothermally-treated wood becomes less hygroscopic (Mirzaei et al 2017). Water uptake of wood is reduced by the heat-treatment process (Hyttinen et al 2010), since hemicellulose and cellulose are the main wood components responsible for decay and hygroscopicity of wood (Li et al 2017).…”

Section: Equilibrium Moisture Content (Emc) and Moisture Exclusion Efficiency (Mee)mentioning

confidence: 99%

Properties of modified wood according to treatment technology and thermo-vacuum process for birch (Betula pendula Roth) veneers

Meija-Feldmane

Cuccui²,

Irbe

et al. 2020

BioRes

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Thermally modified birch (Betula pendula Roth) veneers that had been subjected to wood treatment technology (WTT) or thermo vacuum (TV) processes were compared in this study. After modification of veneers in the range of temperatures from 160 °C to 218 °C and times from 0.5 h to 3 h, the color, mass loss, density, tensile strength, hygroscopicity, and decay resistance against brown rot fungus Coniophora puteana were determined. Treatment regimes with the greatest mass loss were at 217 °C for 3.0 h in TV (7.8%) and 160 °C for 0.8 h in the WTT (6.7%). As expected, wood mass loss correlated well with moisture exclusion efficiency (MEE) in all relative humidity (RH) environments (r = 0.95 to 0.99). Strength loss in the WTT was considerable compared to the TV process (57% and 40%, respectively). The resistance against brown rot fungus was moderate with a mass loss of 12% to 33%. Among the investigated samples, the regime 217/3.0/TV showed the best resistance against brown rot fungus and acceptable other properties.

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“…When dried to 273 h, the 1# and 2# MC sample boards first collapsed at MCs of 15.50% and 17.10%, reaching the collapse depth at 2.69 and 2.33 mm, respectively; as drying continued, the collapse depth also fluctuated, reaching its maximum at 3.21 and 3.39 mm, respectively. Previous research identified tree species, wood density, water content, drying temperature, drying speed, and so on as external factors for wood collapse [27][28][29][30].…”

Section: Drying Defectsmentioning

confidence: 99%

Effect of Impregnation with Maltodextrin and 1,3-Dimethylol-4,5-Dihydroxyethyleneurea on the Conventional Drying Characteristics of Poplar Wood

Cai

et al. 2019

Applied Sciences

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The drying characteristics of poplar wood (Populus adenopoda Maxim) under three treatments were investigated with the aim of improving the drying quality of the impregnated wood. Untreated materials, impregnated materials with 10% initial moisture content (MC), and impregnated materials with 20% initial MC—denoted as T1, T2, and T3, respectively—were examined during conventional drying. Relative to that of T1, the average drying rate of T2 was reduced by 46%, and that of T3 was reduced by 37%. The anti-swelling efficiency of T2 sharply increased, whereas that of T3 only slightly increased in width and thickness. The drying defects of T2 were markedly less than those of T1 and T3, attributed to the reduced residual stress and fixation of the modifier. Scanning electron microscopy indicated that large amounts of modifiers were deposited inside the cell cavity of T2, whereas small amounts of modifiers were deposited in the cell cavity of T3. The impregnation treatment generally reduced the average drying rate and MC uniformity and delayed the decrease in residual stress; however, it reduced the number of defects in the wood and considerably improved the dimensional stability of the wood. Meanwhile, impregnation treatment with increased initial MC could potentially lead to more drying defects and increase production cost.

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Glulam beam made from hydrothermally treated poplar wood with reduced moisture induced stresses

Cited by 35 publications

References 20 publications

Thermal treatment of wood using vegetable oils: A review

Thermal treatment of wood using vegetable oils: A review

Properties of modified wood according to treatment technology and thermo-vacuum process for birch (Betula pendula Roth) veneers

Effect of Impregnation with Maltodextrin and 1,3-Dimethylol-4,5-Dihydroxyethyleneurea on the Conventional Drying Characteristics of Poplar Wood

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