The effect of DMDHEU modification on physical and biological properties of parallel strand lumbers

Kurt, Ramazan; Tomak, Eylem Dizman

doi:10.1016/j.conbuildmat.2018.11.064

Cited by 12 publications

(3 citation statements)

References 28 publications

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“…This is because with the high-density glue layer between the wood layers and was pressed with high pressure during lamination. This is consistent with the research of Özçifçi et al (2007) and Kurt and Tomak (2018).…”

Section: Air-dry Density and Retention Amountsupporting

confidence: 94%

Ultraviolet light and natural weathering vs. the compression strength of laminated wood

Doruk

2023

BioRes

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Effects of protective measures were evaluated relative to the compression strength in the direction parallel to the grain of laminated veneer wood (LVL). For this purpose, laminated panels were prepared from Scots pine, Oriental beech, Castanea sativa, and sessile oak wood veneer by gluing them with Desmodur vinyl trie ketonol acetate (D-VTKA), polyvinyl-acetate (PVAc) dispersion D4 adhesive, resorcinol formaldehyde (RF), and melamine formaldehyde (MF). The samples were impregnated with a mixture of wax, linseed oil, and coated with a synthetic-based translucent varnish. The control samples (without the treatment described above), impregnated samples, and varnished samples were kept in the external environment for 1 y and in an ultraviolet (UV) environment for 240 h. The samples were tested to determine the air-dried density, retention amount, and compression strength. The results indicated that, in terms of outdoor conditions, the varnished proceeding provided better protection compared to the impregnated proceeding. The best result for compression strength was obtained on the Oriental beech samples with RF and MF glues. The ratio of the UV environment to represent the external environment was 89%.

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Section: Air-dry Density and Retention Amountsupporting

confidence: 94%

Ultraviolet light and natural weathering vs. the compression strength of laminated wood

Doruk

2023

BioRes

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“…Extensive studies have been conducted for engineered bamboo materials in terms of mechanical properties and engineering applications [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26]. Mechanical properties of PBSL is significantly affected by the manufacturing process, raw material selection, moisture content and resin properties [1,[8][9][10]. In general, mechanical properties of PBSL are comparable to or surpass that of traditional wood products [6].…”

Section: Introductionmentioning

confidence: 99%

Mechanical performance of parallel bamboo strand lumber columns under axial compression: Experimental and numerical investigation

Tan

Wei³

et al. 2020

Construction and Building Materials

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This paper presents an investigation on the mechanical performance of parallel bamboo strand lumber (PBSL) columns under axial compression. Experimental test and numerical analysis were performed for 40 PBSL columns with various slenderness ratios. Failure modes, ultimate capacity and load-strain response are reported and evaluated. Strength failure is the typical failure mode of columns with small slenderness ratios, however, buckling failure is commonly observed for longer columns. Elastic eigenvalue analysis is found effective to predict critical buckling load of long columns, as buckling occurs within elastic range. However inelastic behavior has significant effect on critical load when the buckling stress exceeds proportional limit of the material. As a result, inelastic approaches provide more accurate prediction of critical load for columns with a slenderness ratio lower than the elastic threshold (λy). The presented experimental results and numerical analysis validated the feasibility of the elastic/inelastic buckling analysis approaches on determination of ultimate capacity of axial loaded PBSL columns.

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“…Chemical modifications to wood, including heat-treatment, acetylation, modification with formaldehyde-based and N-methylol resins, and furfurylation, have been studied; some have been successfully applied in industrial production in recent decades (Xie et al 2013). N-methylol compounds, such as 1,3-dimethylol-4,5-dihydroxyethyleneurea (DMDHEU), are widely used in the textile industry as finishing agents, and have successfully been used as wood modifying agents (Krause et al 2003;Gérardin 2016;Emmerich et al 2019;Kurt and Tomak 2019). Furfuryl alcohol is a low-molecular organic chemical with a strong polarity derived from corn cobs or sugar cane.…”

Section: Introductionmentioning

confidence: 99%

Comparison of physical-mechanical and mould-proof properties of furfurylated and DMDHEU-modified wood

Chen

2019

BioRes

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In this study, 1,3-dimethylol-4,5-dihydroxyethyleneurea (DMDHEU) and furfuryl alcohol (FA) modification catalyzed by acrylic acid were comparatively studied. The effects on physical-mechanical properties and durability against mould of Masson pine and Camphor pine wood were investigated, including weight gain rate (WPG), moisture uptake, equilibrium moisture content (EMC), anti-swelling efficiency (ASE), parallel-to-grain compressive strength (CS), modulus of rupture (MOR), and mould resistance. The wood samples modified with DMDHEU closely retained their original color and texture, whereas the color of furfurylated wood became dark brown and the texture became clearer. The WPG of DMDHEU-treated wood ranged from 17.9% to 29.3%, which was lower than that of furfurylated wood that ranged from 36.7% to 39.3%. The equilibrium moisture content of DMDHEU-modified wood was slightly higher than the untreated wood, while furfurylation decreased the EMC of wood by approximately 50% compared with the untreated wood. The dimensional stability, parallel-to-grain compressive strength, and mildew resistance of Masson pine and Camphor pine improved after both modifications noticeably. It was concluded that acrylic acid can be utilized as a catalyst to perform wood furfurylation and DMDHEU modification.

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The effect of DMDHEU modification on physical and biological properties of parallel strand lumbers

Cited by 12 publications

References 28 publications

Ultraviolet light and natural weathering vs. the compression strength of laminated wood

Ultraviolet light and natural weathering vs. the compression strength of laminated wood

Mechanical performance of parallel bamboo strand lumber columns under axial compression: Experimental and numerical investigation

Comparison of physical-mechanical and mould-proof properties of furfurylated and DMDHEU-modified wood

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