The behavior of horizontally glued laminated beams using rubber wood

Nadir, Yashida; Nagarajan, Praveen

doi:10.1016/j.conbuildmat.2014.01.032

Cited by 42 publications

(28 citation statements)

References 7 publications

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“…The mean values obtained for shear strength of rubber trees with and without preservative treatment ranged from 10.23 to 10.84 MPa, with no statistical differences between treatments. Nadir and Nagarajan (2014) when evaluating the behavior of GLT beams using rubberwood, obtained 13.45 MPa of shear strength, while Parra-Serrano et al 2018found mean values of 10.63 MPa for the same mechanical property.…”

Section: Mechanical Characterization Of the Glulam Beams Of Rubberwoodmentioning

confidence: 97%

“…The shear strength depends on the strength of the adherent materials wood and adhesive, on the stress distribution within the glue line and on the ability of the adhesive to transfer the acting stress into the glue line and thus from one adherent surface to the other (Steiger;Arnold;Risi, 2014). The literature reports MOR values ranging from 49.25 to 83.33 MPa for glued laminated beams produced with rubberwood (Nadir;Nagarajan, 2014;Parra-Serrano et al, 2018). The wood treated with CCA and CCB showed the lower values for MOR and this strength loss can reach up to 20% depending on the product retention and severity of the drying temperature applied as American Wood Protection Association -AWPA (2016).…”

Section: Mechanical Characterization Of the Glulam Beams Of Rubberwoodmentioning

confidence: 99%

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Physical and mechanical behavior of glulam beams produced with rubberwood treated with preservatives

et al. 2020

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This work aimed to evaluate the physical and mechanical behavior of glued laminated timber (GLT) - glulam pieces of Hevea brasiliensis treated with chromed copper arsenate (CCA), chromed copper borate (CCB) and pyrethroid in the production of GLT. The pieces were produced using three wooden laminae with dimensions of 60 x 20 x 1200 mm, (width x thickness x length), joined with epoxy adhesive under 1.0 MPa pressure for 24h at room temperature. The rubberwood had an apparent density of 0.624 g cm-3, a value close to that of Eucalyptus grandis wood, a species traditionally used in the manufacture of GLT. Regarding the GLT parts, it was observed that the preservative treatment with CCA and CCB influenced negatively the values of the mechanical properties. For resistance modulus (MOR), a reduction of 75.44 MPa to 62.36 and 58.57 MPa was found for the parts untreated and treated with CCA and CCB, respectively. There was no statistical difference for surface treatment with pyrethroid. The photomicrographs of the glue line showed that the reduction in these values was mainly due to the penetration of preservative solutions into the wood structure (cell lumens and vessels or pores), impairing the anchoring of the adhesive.

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Section: Mechanical Characterization Of the Glulam Beams Of Rubberwoodmentioning

confidence: 97%

Section: Mechanical Characterization Of the Glulam Beams Of Rubberwoodmentioning

confidence: 99%

Physical and mechanical behavior of glulam beams produced with rubberwood treated with preservatives

et al. 2020

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“…It is therefore, an engineered wood product (EWP) which consists of layers of stress graded timber horizontally glued up with grains parallel to each other using adhesives. It as an engineered beam glued up from selected wood pieces, or laminations prepared either in a straight or curved shape with the grain of all pieces aligned parallel to the longitudinal axis of the member (APA, 2018;Moody and Hernandez, 1997;Nadir and Nagarajan, 2014). According to Nadir (2014), it is an effective method for deriving higher performance properties from sawn timber.…”

Section: Innovative Use Of Timber: Engineered Wood Products (Ewp)mentioning

confidence: 99%

Forest Product Industry and Engineered Wood Products: The Nigerian Experience

Ekundayo¹,

Arum²,

Owoyemi³

2021

jasem

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The forest product industry in Nigeria is barely surviving rather than thriving. Faced with a lot of challenges, the industry has witnessed the closure of many wood processing industries while a few are operating at low capacity. This paper examines engineered wood products and the outlook on wood and wood products in Nigeria. It discusses some of the challenges that have inhibited the growth of the industry and provides recommendations for reinventing the industry through development of modern value-added wood products for sustainable building construction. Keywords: Collaboration; Engineered wood products; Forestry product industry; Glulam; Sustainability.

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“…Existe evidencia empírica de que la madera laminada, comparativamente con la madera sólida, mejora su densidad aparente y su módulo de elasticidad (ERDIL et al, 2009). Esta tecnología reduce además defectos naturales en la madera sólida, como son nudos y fisuras estructurales (NADIR;NAGARAJAN, 2014). Así, la madera laminada puede ser una alternativa para sustituir a la madera sólida (BOURREAU et al, 2013).…”

Section: Introductionunclassified

Caracterización mecánica por ondas de esfuerzo de la madera laminada de tres especies angiospermas

Castellanos

2020

RCM

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RESUMEN Existe evidencia empírica de que la madera laminada, comparativamente con la madera sólida mejora su densidad aparente y su módulo de elasticidad. El objetivo de la investigación fue determinar la densidad, la velocidad de onda y el módulo dinámico por ondas de esfuerzo en madera sólida y laminada de Enterolobium cyclocarpum, Tabebuia rosea y Juglans pyriformis. Se elaboraron probetas de madera sólida y laminada de pequeñas dimensiones y se realizaron pruebas de ondas de esfuerzo. La densidad aparente de la madera laminada, en comparación con la de la madera sólida, se incrementa para las tres especies. En cambio, el módulo dinámico de la madera laminada aumenta para Enterolobium cyclocarpum y Tabebuia rosea, pero disminuye para Juglans pyriformis. La variabilidad de la densidad aparente, la velocidad de onda y el módulo dinámico, aumentan o disminuyen según se trate de la especie y o del parámetro en cuestión. Los resultados son válidos para el caso de laminado de pequeñas probetas de las especies estudiadas. Para su aplicación a proyectos de ingeniería, es recomendable realizar estudios ex profeso. Palabras clave: densidad aparente; velocidad de onda; módulo dinámico. Mechanical characterization by stress waves of the laminated wood of three angiosperm species ABSTRACT There is empirical evidence that laminated wood, compared to solid wood, improves its bulk density and modulus of elasticity. The objective of the research was to determine the apparent density, the wave velocity and the dynamic modulus by stress waves in solid and laminated wood of Enterolobium cyclocarpum, Tabebuia rosea and Juglans pyriformis. Solid and laminated wood specimens of small dimensions were prepared, and stress wave tests were carried out. The apparent density of laminated wood, in comparison with that of solid wood, increases for all three species. In contrast, the dynamic modulus of laminated wood increases for Enterolobium cyclocarpum and Tabebuia rosea but decreases for Juglans pyriformis. The variability of the apparent density, the wave velocity and the dynamic modulus, increases or decreases depending on the species and/or parameter in question. The results are valid for the case of laminated small specimens of the species studied. For its application to engineering projects, it is advisable to carry out ex profeso studies.

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The behavior of horizontally glued laminated beams using rubber wood

Cited by 42 publications

References 7 publications

Physical and mechanical behavior of glulam beams produced with rubberwood treated with preservatives

Physical and mechanical behavior of glulam beams produced with rubberwood treated with preservatives

Forest Product Industry and Engineered Wood Products: The Nigerian Experience

Caracterización mecánica por ondas de esfuerzo de la madera laminada de tres especies angiospermas

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