Performance test of Laminated Veneer Lumber (LVL) from rubber wood for different physical and mechanical properties

Kamala, B. S.; Kumar, P. T. Santhosh; Rao, R. V.; Sharma, S. N.

doi:10.1007/s001070050025

Cited by 39 publications

(20 citation statements)

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“…The effectiveness of adhesion was determined by measuring the shear strength and the portion of wood failure when the wood was saturated with water before testing. The type of the preservative, the retention amount, and the length of assembly time, all affected the durability of the bonds significantly 5–7. In literature, pressure treatment with wood preservatives has been reported to interfere with the bond integrity of solid wood glued specimens.…”

Section: Introductionmentioning

confidence: 99%

Determination of some physical and mechanical properties of laminated veneer lumber impregnated with boron compounds

Özçi̇fçi̇

Örs

Uysal

2007

J of Applied Polymer Sci

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The aim of this study was to determine the effects of Tanalith‐C 3310 (T‐C 3310), borax (Bo), boric acid (Ba), borax + boric acid (Bo + Ba), and diammonium phosphate (D) impregnations for some physical and mechanical properties of laminated veneer lumber (LVL). The veneers used for the LVL samples (based on BS EN 204) were cut from Scots pine (Pinus sylvestris L.), oriental beech (Fagus orientalis L.), and poplar (Populus nigra). They were impregnated with full‐cell method according to ASTM‐D 1413 standards and bonded with phenol formaldehyde (PF) and melamine formaldehyde (MF) adhesives. The following parameters have been tested: density, compression strength, bending strength, modulus of elasticity (MOE) in bending, and shear strength tests. Test results obtained from this study showed that impregnation with Boric acid and Tanalith‐C 3310 (based acidic characteristic) affected the strength of LVL negatively, when the wood material is impregnated with acidic impregnations and bonded with PF, which is an alkali, the glue‐line becomes more elastic, the bonding strength of adhesive weakens. Boric acid and Tanalith‐C 3310 impregnations could not be recommended for LVL elements exposed to bending or shear strength. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007

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Section: Introductionmentioning

confidence: 99%

Determination of some physical and mechanical properties of laminated veneer lumber impregnated with boron compounds

Özçi̇fçi̇

Örs

Uysal

2007

J of Applied Polymer Sci

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“…7). Performance of LVL made from paricá, expressed in f c,0 , was low in comparison to results observed for LVL made from Hevea brasiliensis (Kamala et al 1999), Fagus orientalis (Aydin et al 2004) and other species of Pinus (Gabriel 2007;Souza et al 2011) and Eucalyptus (Pio 2002;Aydin et al 2004). However, the values obtained for all treatments were greater than those required for structural design using LVL type compounds.…”

Section: Mechanical Propertiesmentioning

confidence: 78%

“…Iwakiri et al (2010) observed values for shear stress parallel to the glue line for LVL made from paricá, glued with phenol-formaldehyde to be in a range between 1.81 N/ mm 2 and 2.47 N/mm 2 , approximately half of the resistance obtained for this study. Using the same glue, Kamala et al (1999) found a parallel shear strength of 9.4 N/mm 2 and perpendicular shear strength of 10.5 N/mm 2 for LVL made from rubber tree veneers (Hevea brasiliensis). For LVL made from Eucalyptus grandis, Pio (2002) obtained parallel and perpendicular shear resistance of 11.64 and 11.91 N/mm 2 , respectively.…”

Section: Mechanical Propertiesmentioning

confidence: 94%

Effects of grading of veneers on properties of LVL made from Schizolobium amazonicum Huber ex. Ducke

Melo

Menezzi²

2015

Eur. J. Wood Prod.

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The work aimed at evaluating the influence of pre-classification of veneer made from paricá (Schizolobium amazonicum Huber ex. Ducke) plantation trees on Laminated Veneer Lumber (LVL) properties. This species is native to the Amazonian and is fast growing with low density. For LVL production, veneers were separated into four classes according to the density or dynamic modulus of elasticity. LVL was produced considering three different strategies of assembly-random veneers assembly; assembly using veneers with greater E Md placed at the surface layer with gradual reduction up to the center of the panels; assembly using veneers with greater density placed at the surface layer and gradual reduction into the center of the panels. The following mechanical and physical properties were then evaluated: static bending modulus of elasticity (E M ), modulus of rupture (f M ), compression strength parallel to grain (f c0 ), shear strength parallel to glue-line (f v0 ), shear strength perpendicular to glue-line (f v90 ), water absorption and thickness swelling for 2 and 24 h of water immersion. Physical properties of LVL were not found to be influenced by different pre-classification strategies, while for mechanical properties only bending strength at flatwise position was influenced by pre-classifying veneers.

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“…Hence, LVL has the potential to be used in structural and nonstructural applications such as construction and furniture industry, material for flooring, and numerous other areas. [1,4,5] The changes of properties that are characteristics of LVL are caused by various factors acting upon this material during the production process. First of all, the properties depend on the wood species from which the panels are manufactured.…”

Section: Introductionmentioning

confidence: 99%

Effect of Some Chemicals on Thermal Conductivity of Impregnated Laminated Veneer Lumbers Bonded with Poly(vinyl acetate) and Melamine–Formaldehyde Adhesives

Kol

Altun

2009

Drying Technology

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Thermal conductivity is a very important parameter in determining heat transfer rate and is required for the development of drying models and for the industrial operations such as adhesive cure rate. The objective of this research was to investigate the effects of impregnation on the thermal conductivity of six-layered laminated veneer lumber (LVL) made of beech and pine. Boric acid, zinc chloride, and ammonium sulfate were used as impregnation chemicals and poly(vinyl acetate) (PVAc) and melamine-formaldehyde (MF) adhesives as bonding agent were used to produce LVLs. The veneers were impregnated by using the vacuum-pressure method. The thermal conductivity test was performed based on ASTM C 1113-99 hot-wire method. Results showed that the impregnation chemicals increase the thermal conductivity. As impregnation chemicals the highest values were obtained with boric acid and zinc chloride. In addition, the thermal conductivity of LVL made of beech was higher than that of LVL made of pine. The thermal conductivity of LVL bonded with PVAc was absolutely higher than LVL bonded with MF in both wood species.

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Performance test of Laminated Veneer Lumber (LVL) from rubber wood for different physical and mechanical properties

Cited by 39 publications

References 0 publications

Determination of some physical and mechanical properties of laminated veneer lumber impregnated with boron compounds

Determination of some physical and mechanical properties of laminated veneer lumber impregnated with boron compounds

Effects of grading of veneers on properties of LVL made from Schizolobium amazonicum Huber ex. Ducke

Effect of Some Chemicals on Thermal Conductivity of Impregnated Laminated Veneer Lumbers Bonded with Poly(vinyl acetate) and Melamine–Formaldehyde Adhesives

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