Assessment in Bending and Shear Strength of Glued Laminated Timber Using Selected Malaysian Tropical Hardwood as Alternative to Timber Railway Sleepers

Bhkari, Norshariza Mohamad; Ahmad, Zakiah; Bakar, Ab Halim Abu; Tahir, Paridah Md.

doi:10.11113/jt.v78.8627

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…However, concerning wood panel products, not much research has been done on the effect of CCA preservation on the mechanical behaviour of Eucalyptus wood especially in glue-laminated products a.k.a Glulam. Glulam products have been successfully applied in construction as building materials (Raftery & Whelan, 2014) because with application of Glulam technology timbers with low density can be improved to a higher grade (Mohamad et al, 2016;Mohamad et al, 2014). Nonetheless, because they are derived from wood they need chemical pretreatment to protect them from biological degradation (Wang et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Effect of Chromated Copper Arsenate impregnation treatment on flexural and shear properties of Glue Laminated Eucalyptus grandis

Zziwa

Nabacwa

Kizito

et al. 2023

Preprint

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This study examined the effect of Chromated Copper Arsenate (CCA) preservative treatment on selected mechanical properties of glue laminated Eucalyptus grandis wood. Test specimens were prepared and tested for Modulus of Elasticity [MOE], Modulus of Rupture [MOR] and shear strength using a Universal Testing Machine in accordance with ASTM D198 and BS373. The soaking delamination test was used to test for delamination percentage. The data was analyzed using the Levene’s test for the flexural properties (MOE and MOR) and one-way ANOVA test for the shear properties at 95% significance level. The results showed that MOE and MOR decreased in the treated glulam samples by 19.1% and 13.3% respectively. The shear strength properties also decreased in the treated samples by 3.3%. However, no delamination was found in all glulams. The treated wood glulams had lower MOE, MOR and shear strength properties than that of the untreated glulams but no significant differences in strength properties were detected. In conclusion, treatment of the eucalyptus glulam with CCA does not significantly weaken its flexural and shear properties. It is recommended that glulams extracted from CCA treated Eucalyptus grandis should not be used for high structural purposes but could be used in light construction works.

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Section: Introductionmentioning

confidence: 99%

Effect of Chromated Copper Arsenate impregnation treatment on flexural and shear properties of Glue Laminated Eucalyptus grandis

Zziwa

Nabacwa

Kizito

et al. 2023

Preprint

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show abstract

“…Glulam is now well recognized as a high-performance timber composite material for use in buildings. Glulam is a structural product timber that is manufactured by gluing together separate parts of dimensioned and strength-graded timber under specified manufacturing conditions [1]. Based on the needed specifications, glulam can be manufactured and engineered to address the requirements of the construction sector.…”

Section: Introductionmentioning

confidence: 99%

Manufacturing Study on Different Glue Spread and Press Pressure for Glued Laminated Timber Made from Laran

Muhammad Amirul Akmal Rosli,

Norshariza Mohamad Bhkari,

Muhammad Muzammil Zuki

et al. 2023

ARAM

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Amidst challenges such as dwindling timber log supply from natural forests, concerns about timber quality, and rising timber costs, the timber industry has increasingly turned to engineered lumber solutions, including glued laminated timber (glulam) crafted from fast-growing species. However, the performance of glulam derived from plantation trees, notably swift-growing varieties like Laran, remains an area warranting exploration. This study addresses critical aspects of glulam production, encompassing adhesive selection, spread rate, and press pressure, which collectively influence material performance. The objectives of this research encompass an assessment of the bonding integrity of glulam originating from Laran plantation species and an evaluation of the optimal adhesive spread rate and press pressure for Laran-derived glulam. Various adhesive spread rates (200 g/m2, 250 g/m2, 350 g/m2 and 400 g/m2) and press pressures (0.7, 1.0 and 1.4 MPa), utilizing Phenol-Resorcinol Formaldehyde (PRF) adhesives, were systematically investigated in alignment with the guidelines stipulated in MS 758: 2020. Bonding integrity was evaluated via block shear and cyclic delamination tests. The study reveals that these parameters indeed exert a tangible influence on the bonding efficacy of PRF adhesive with Laran species. Remarkably, an optimal adhesive spread rate of 399.78 g/m2 and press pressure of 1.18 MPa emerged as pivotal thresholds for superior bonding outcomes. Notably, the significance of adeptly designed glulam beams within wooden structural frameworks is underscored, particularly in light of the multifaceted imperatives of sustainability, economics, and environmental conscientiousness.

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Bending and Bonding Properties of Mixed-Species Glued Laminated Timber From Merpauh, Jelutong and Sesendok

2019

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This study investigates the bending and bonding performances of glued laminated timber beams manufactured using a combination of Malaysian lower and higher- grade timber species. Two types of beams were prepared which were mono-species and mixed-species glulam. Mono-species glulam with uniform layup were fabricated using Merpauh, Jelutong and Sesendok. Mixed-species glulam with balanced layup were fabricated whereby Merpauh was positioned equally at the outer layers and either Jelutong or Sesendok were positioned at the inner layers. Three replicates of ten-layered glulam beams measuring 100 mm in width, 300 mm in depth and 6200 mm in length were manufactured according to MS758 for each mono and mixed-species glulam. Bending, delamination and block shear tests were done on all the glulam beams. The results show that glulam manufactured from the combination of Sesendok and Merpauh obtained the highest bending properties and structural efficiency. In addition, the bonding performance at the interface between Sesendok-Merpauh lamellas proved to be excellent.

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Assessment in Bending and Shear Strength of Glued Laminated Timber Using Selected Malaysian Tropical Hardwood as Alternative to Timber Railway Sleepers

Cited by 3 publications

References 4 publications

Effect of Chromated Copper Arsenate impregnation treatment on flexural and shear properties of Glue Laminated Eucalyptus grandis

Effect of Chromated Copper Arsenate impregnation treatment on flexural and shear properties of Glue Laminated Eucalyptus grandis

Manufacturing Study on Different Glue Spread and Press Pressure for Glued Laminated Timber Made from Laran

Bending and Bonding Properties of Mixed-Species Glued Laminated Timber From Merpauh, Jelutong and Sesendok

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