Some technological properties of laminated veneer lumber produced with fast-growing Poplar and Eucalyptus

Bal, Bekir Cihad

doi:10.4067/s0718-221x2016005000037

Cited by 30 publications

(31 citation statements)

References 25 publications

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“…The interest in fast-growing plantation species such as eucalypt is increasing as they may have the potential to ensure a sustainable supply of raw materials for producing mass laminated timber products for different structural building applications [1][2][3][4][5][6]. The goal of this study was to characterise the physical and mechanical properties of lumber obtained from a 16-year-old pulpwood Eucalyptus nitens (E. nitens) H.Deane & Maiden resource.…”

Section: Introductionmentioning

confidence: 99%

Characterisation of Physical and Mechanical Properties of Unthinned and Unpruned Plantation-Grown Eucalyptus nitens H.Deane & Maiden Lumber

Derikvand

Kotlarewski

Lee

et al. 2019

Forests

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The use of fast-growing plantation eucalypt (i.e., pulpwood eucalypt) in the construction of high-value structural products has received special attention from the timber industry in Australia and worldwide. There is still, however, a significant lack of knowledge regarding the physical and mechanical properties of the lumber from such plantation resources as they are mainly being managed to produce woodchips. In this study, the physical and mechanical properties of lumber from a 16-year-old pulpwood Eucalyptus nitens H.Deane & Maiden resource from the northeast of Tasmania, Australia was evaluated. The tests were conducted on 318 small wood samples obtained from different logs harvested from the study site. The tested mechanical properties included bending modulus of elasticity (10,377.7 MPa) and modulus of rupture (53 MPa), shear strength parallel (5.5 MPa) and perpendicular to the grain (8.5 MPa), compressive strength parallel (42.8 MPa) and perpendicular to the grain (4.1 MPa), tensile strength perpendicular to the grain (3.4 MPa), impact bending (23.6 J/cm2), cleavage (1.6 kN) and Janka hardness (23.2 MPa). Simple linear regression models were developed using density and moisture content to predict the mechanical properties. The variations in the moisture content after conventional kiln drying within randomly selected samples in each test treatment were not high enough to significantly influence the mechanical properties. A relatively high variation in the density values was observed that showed significant correlations with the changes in the mechanical properties. The presence of knots increased the shear strength both parallel and perpendicular to the grain and significantly decreased the tensile strength of the lumber. The results of this study created a profile of material properties for the pulpwood E. nitens lumber that can be used for numerical modelling of any potential structural product from such a plantation resource.

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Section: Introductionmentioning

confidence: 99%

Characterisation of Physical and Mechanical Properties of Unthinned and Unpruned Plantation-Grown Eucalyptus nitens H.Deane & Maiden Lumber

Derikvand

Kotlarewski

Lee

et al. 2019

Forests

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“…Investigations by Muzin et al (2013) prove that using wood of higher density in the core layer favourably affects the bond quality. It results from the obvious fact that wood of higher density is characterized by better shear strength (Bal 2016). That is why, in comparison to variant I, plywood produced according to variant 2, with face layers made from low density wood, such as linden, willow and spruce, shows better bond quality if the core layer is substituted with higher density pine veneer.…”

Section: Tab 4: Bond Quality Of Experimental Plywoodmentioning

confidence: 99%

“…So far, the results of investigations have shown that both plywood and LVL can be manufactured with use of not only these wood species, but also plantation wood species. Investigations by Bal andBektas (2012, 2014) and Bal (2016) prove that mechanical properties (bending strength and modulus of elasticity) of LVL and plywood manufactured from eucalyptus are comparable to those made from beech. Research works conducted by Iwakiri et al (2006Iwakiri et al ( , 2013 also confirm that various types of eucalyptus wood can be successfully applied in the production of plywood.…”

Section: Introductionmentioning

confidence: 97%

Water Resistant Plywood of Increased Elasticity Produced From European Wood Species

Biadała¹,

Czarnecki²,

Dukarska³

2020

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The paper investigates the possibility of producing the water-resistant plywood of increased elasticity with use of veneers attained from European wood species, such as alder, birch, beech, pine as well as linden, poplar, willow and spruce. Plywood was produced in two variants. Variant I of plywood was made from various wood species, yet the veneers were of the same thickness. In variant II the centre layer in each case was made from 1 mm thick pine veneer and the face layers were made from 1.4 mm thick veneers of various wood species. The produced plywood was subjected to tests on modulus of rupture, modulus of elasticity and tensile strength, bond quality and compression ratio. Specific values of modulus of rupture and modulus of elasticity were also determined taking into consideration the differences in the thickness of applied veneers. Based on these investigations, the authors concluded that, regardless of the manufacturing method, the highest values of modulus of rupture as well as modulus of elasticity and bond quality are achieved for plywood made from linden, poplar, willow and spruce. The change in the plywood structure (variant II) resulted in a considerable decrease in the values of modulus of rupture and modulus of elasticity (and their specific values) both parallel and across the grain. The lowest values of these parameters were obtained for poplar, linden and willow plywood. What is more, as a result of the applied procedure the bond quality of the produced plywood increased and the compression ratio was reduced. Taking the above into account, we can assume that linden, poplar and willow wood is an optimum choice for the face veneers of plywood with increased elasticity. The centre layer of this kind of plywood can be made from pine veneer of lesser thickness.

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“…An increasing amount of studies on the physical and mechanical properties of LVL panels produced from eucalyptus emerged in recent years. It was found that eucalyptus-based LVLs are comparable to those made from poplar, Beech, and even Norway spruce [11][12][13][14][15][16]. However, it was also summarized that various problems still exist in the production of eucalyptus-based LVLs, including the glue difficulty, end-splits, and breakage of sheets of veneer [11].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of a Eucalyptus-Based Oriented Oblique Strand Lumber for Structural Applications

Chen¹,

Xiong²,

Wang³

et al. 2019

Journal of Renewable Materials

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Wood and wood-based composite materials have gained increasing attention in the sustainable building industry because of their renewability and environmental friendliness. Oriented oblique strand lumber (Eucalyptus Strand Wood, ESWood), which is manufactured from fast-growing small diameter eucalyptus wood (Eucalyptus urophylla × E. grandis), is introduced in this paper. Small clear specimen tests were conducted to determine the mechanical properties of ESWood material while full-scale component tests were performed to observe the structural performance of ESWood beams. A comparison of mechanical properties of ESWood with other wood/bamboo-based materials is then reported. From the results presented herein, it appears that the strength and stiffness properties of ESWood are affected by grain directionality and glued layers. However, it still has preferable mechanical properties as a building material, which is comparable or superior to those of other engineered wood/bamboo-based products (e.g., Sitka spruce, LVL, OSL, Glulam, and Glubam). Furthermore, results from full-scale component tests show the stable mechanical performance of beams made by ESWood. This study makes a significant contribution to a potential utilization of fast-growing eucalyptus for general use in construction, and the presented mechanical tests results can serve as a fundamental data for more applications of ESWood in practical engineering.

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Some technological properties of laminated veneer lumber produced with fast-growing Poplar and Eucalyptus

Cited by 30 publications

References 25 publications

Characterisation of Physical and Mechanical Properties of Unthinned and Unpruned Plantation-Grown Eucalyptus nitens H.Deane & Maiden Lumber

Characterisation of Physical and Mechanical Properties of Unthinned and Unpruned Plantation-Grown Eucalyptus nitens H.Deane & Maiden Lumber

Water Resistant Plywood of Increased Elasticity Produced From European Wood Species

Mechanical Properties of a Eucalyptus-Based Oriented Oblique Strand Lumber for Structural Applications

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