Influence of Storage Period of Pieces in Stiffness of &lt;i&gt;Pinus elliottii&lt;/i&gt; Glulam Beams

Christofóro, André Luis; Lahr, Francisco Antônio Rocco; Chahud, Eduardo; Branco, Luiz Antônio Melgaço Nunes; Battistelle, Rosane Aparecida Gomes; Valarelli, Ivaldo De Domênico

doi:10.4028/www.scientific.net/amr.1025-1026.64

Cited by 3 publications

(4 citation statements)

References 7 publications

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“…As an engineered wood product Glued Laminated Timber (Glulam) requires manufacturing precision in all its stages [2][3][4], and only laboratory tests can be used to evaluate finished specimens [5][6][7]. To ensure that glulam properties are appropriate to the strength required by normative codes quality control is required in production [8].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Shear Strength and Cyclic Delamination of Paricá (Schizolobium amazonicum) Glued Laminated Timber

Cavalheiro¹,

Neto²,

Christofóro³

et al. 2016

ijme

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Glued laminated timber (glulam) is an engineered product that requires manufacturing precision in all its stages.The finished product can only be tested in laboratory conditions; however, it is necessary to provide the quality control in production to ensure that glulam properties are appropriate to the product specified requirements in accordance with proper codes. This research aimed to evaluate the proposed trials conducted with combinations of Paricá (Schizolobium amazonicum, a tropical wood species coming from a certificate reforestation area), three adhesives (polyurethane, phenol resorcinol formaldehyde, melamine formaldehyde) and two types of treatment (CCA, CCB). The shear strength and delamination test results of all the treated samples showed the good performance of Paricá glulam, which can be used to indoor and outdoor applications.

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Section: Introductionmentioning

confidence: 99%

Evaluation of Shear Strength and Cyclic Delamination of Paricá (Schizolobium amazonicum) Glued Laminated Timber

Cavalheiro¹,

Neto²,

Christofóro³

et al. 2016

ijme

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“…Several papers aim to associate the improvement in the production processes and composition of glulam (Calil Neto et al, 2014;Christoforo et al, 2014;Lahr et al, 2015;Icimoto et al, 2016), where the adhesives most used in industrial scale for glulam production and wood based panels have formaldehyde in their constitution, as resorcinol-formaldehyde, urea-formaldehyde; phenol-formaldehyde; phenol-resorcinol-formaldehyde; melamine-formaldehyde; melanine-urea-formaldehyde and tannin-formaldehyde (Guimarães et al, 2014;Scatolino et al, 2017;Martins et al, 2018;Martins et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Number of laminae on the mechanical behavior of glued laminated timber (glulam) of Toona ciliata produced with vegetable polyurethane adhesive

et al. 2019

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The glued laminated timber (glulam) is a composite material obtained from the bonding of wood laminae arranged with parallel fibers put together. The purpose of this paper was to evaluate the influence of the number of laminae on the mechanical behavior of glulam of Toona ciliata produced with vegetable-based polyurethane adhesive. The glulam beams were produced with lamellae in the dimensions of 6.0 x 1.5 x 120.0 cm, with 3 beams being made per treatment, which were structurally composed by 5, 7 and 9 laminae. The polyurethane adhesive based on castor oil was used, applying a grammage of 350 g m-². For the technological characterization of the wood the moisture in the dry base, bulk density, chemical characterization, compressive strength parallel to the fibers, shear and modulus of elasticity (MOE) and rupture (MOR) in the static bending test. While the properties of modulus of elasticity (MOE), modulus of rupture (MOR), shear strength, delamination and visualization of the glue line through photomicrographs of the laminated wood samples were determined for glulam beams. The results showed that the beams with 5 laminae presented values similar to solid wood. The increase in the number of laminae provided lower values for stiffness and strength of the beams. The photomicrographs showed the quality of the bonding and the satisfactory values for shear strength and delamination, indicating the viability of the species under study for situations with high moisture content.

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“…In order to provide competitiveness to Glulam in opposite to other building materials, such as reinforced concrete and steel, beyond of disclosure aiming to increase demand, it is also necessary to develop researches aiming lowering final product cost, that can occur with improvement of manufacturing processes as well as with raw materials economy [4,6].…”

Section: Introductionmentioning

confidence: 99%

“…As an engineered product, its production process requires an industry with quality control on manufacturing steps by trained manpower and raw material with compatible performance to requirements of products [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Influence of Lamellar Thickness on Strength and Stiffness of Glued Laminated Timber Beams of Pinus oocarpa

Icimoto¹,

Neto²,

Ferro³

et al. 2016

ijme

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Glued laminated timber is a structural engineered product that requires precision and strict quality control in its manufacture. For ensure that produced elements properties are in compliance with regulatory requirements, final product must be tested under laboratory conditions. Determining factors in final glulam pieces cost are the type and the quantity of adhesive used in structural elements manufacture. This study aimed to investigate, aided by three point static bending tests and variance analysis (ANOVA), influence of glue lines (3, 5, 7) and lamellae (4, 6, 8) on strength (MOR) and stiffness (MOE) properties of glulam beams manufactured with Pinus oocarpa (CCA treated) and bonded with Phenol Resorcinol resin (Cascophen RS-216-M). These beams presented nominal dimensions 90mm wide; 100mm height; and 1350mm length. For 100 mm fixed height, three beams configurations were tested (a) with four lamellae of 25 mm (3 glue lines); with 6 lamellae of 16,7 mm (5 glue lines) and 8 lamellae of 12.5 mm each (7glue lines), being fabricated 6 beams for experimental condition. In addition to investigating influence of glue lines and lamellae number, possibility of estimating MOE and MOR based on apparent density was also evaluated. ANOVA results showed no significance about glue lines number (or lamellae thickness) in strength and stiffness values, implying, for economic reasons, be configuration with four 25mm lamellae the best among tested beams. From regressions, apparent density was only significant in MOE estimating (R 2 = 46.90%), indicating not be possible to estimate the stiffness and strength values of the glued laminated timber evaluated by the apparent density.

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Influence of Storage Period of Pieces in Stiffness of <i>Pinus elliottii</i> Glulam Beams

Cited by 3 publications

References 7 publications

Evaluation of Shear Strength and Cyclic Delamination of Paricá (Schizolobium amazonicum) Glued Laminated Timber

Evaluation of Shear Strength and Cyclic Delamination of Paricá (Schizolobium amazonicum) Glued Laminated Timber

Number of laminae on the mechanical behavior of glued laminated timber (glulam) of Toona ciliata produced with vegetable polyurethane adhesive

Influence of Lamellar Thickness on Strength and Stiffness of Glued Laminated Timber Beams of Pinus oocarpa

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