Evaluation of Mechanical Properties of Reinforced Poplar Laminated Veneer Lumber

Wang, Jie; Guo, Xiaoguang; Zhong, Wei; Hui-yun, Wang; Cao, Pingxiang

doi:10.15376/biores.10.4.7455-7465

Cited by 16 publications

(16 citation statements)

References 14 publications

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“…The thickness swelling was slightly higher, but the water absorption was lower than usually found in the literature for LVL [15]. Probably the main reason behind this behavior is the level of pressure applied.…”

Section: Resultsmentioning

confidence: 65%

“…Wang et al [14] found f m ranged from 79.9 to 90.5 N/mm 2 whereas the E M ranged from 8362–9185 N/mm 2 for non-reinforced poplar PF resin-bonded LVL. Recently, Bal [15] also evaluated the properties of PF-bonded poplar LVL and found 66.1 N/mm 2 for f m and 5433 N/mm 2 for E M . The values presented here were also between the range presented by the Forest Products Laboratory [16] for E M (4900–12,500 N/mm 2 ) and f m (33.8–88.2 N/mm 2 ).…”

Section: Resultsmentioning

confidence: 99%

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Reactions with Wood Carbohydrates and Lignin of Citric Acid as a Bond Promoter of Wood Veneer Panels

et al. 2018

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The reaction of citric acid with wood veneers was studied by Cross Polarization Magic Angle Spinning Nuclear Magnetic Resonance (CP MAS 13C NMR) and matrix assisted laser desorption ionization time of flight (MALDI ToF) mass spectrometry. The analysis showed that reactions of citric acid occurred with both lignin and carbohydrate constituents of wood. The reactions occurring are esterifications between the carboxylic acid functions of citric acid and the numerous aromatic and aliphatic hydroxyl groups of the main wood constituents. Reaction of citric acid with glucose as a simple model compound of carbohydrates hydroxyl groups also yielded reactions leading to linear and branched oligomers by esterification. The result indicate that the reactions of esterification are accompanied in parallel by some internal rearrangements of lignin. The applied results on bonding wide flat wood surfaces such as veneers to obtain LVL panels yielded excellent strength results even if the conditions of pressing were more drastic than what is usual for this application. The applied bonding results have shown that citric acid has great potential to be used as a bio-binder for wood veneers.

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Section: Resultsmentioning

confidence: 65%

Section: Resultsmentioning

confidence: 99%

Reactions with Wood Carbohydrates and Lignin of Citric Acid as a Bond Promoter of Wood Veneer Panels

et al. 2018

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“…Bal [27] found MOR ranged from 79.9 to 90.5 N/mm 2 whereas the MOE ranged from 8362-9185 N/mm 2 for non-reinforced poplar PF resin-bonded LVL. Recently, Wang et al [28] also evaluated the properties of PF-bonded poplar LVL and found 66.1 N/mm 2 for MOR and 5433 N/mm 2 for MOE. The values presented here are also between the range presented by the Forest Products Laboratory [29] for MOE (4900-12500 N/mm 2 ) and MOR (33.8-88.2 N/mm 2 ) for the experimental cases T5, T6 and T7, with T6 performing in general better that the other two.…”

Section: Muf Resinmentioning

confidence: 99%

MUF Resins Improved by Citric Acid as Adhesives for Wood Veneer Panels

Menezzi¹,

Pizzi²,

Amirou³

et al. 2023

Journal of Renewable Materials

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This article presents the first applied results of using citric acid in combinations with a melamine-urea-formaldehyde (MUF) resin for bonding wood veneers. The chemical reactions involved are shown based on a MALDI ToF analysis of the reaction of the MUF resin with citric acid. The preliminary results of the physical and mechanical properties of the LVL prepared are also presented. Veneers from Populus sp were used to manufacture 5-layer laminated veneer lumber (LVL) of small dimensions. Five combinations of the amount of citric acid, MUF spread rate and pressing parameters were tested. LVL bonded with 20% of citric acid + 100 g/m 2 of MUF, hotpressed using a 3-step process with maximum 1.5 MPa of pressure yielded the board with better dimensional stability and mechanical properties. It could be concluded that citric acid in combination with MUF can be used for bonding wood veneer and the research should be continued to study further the parameters involved and to enhance the results.

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“…Furthermore, previous works have demonstrated the importance of the quality of the wood used in laminated lumber under bending stresses [15]. The use of carbon and basalt fiber reinforced polymers (CFRP and BFRP, respectively) has been studied in sawn wood and technological products such as glulam and LVL elements, demonstrating the improvement of mechanical properties under different reinforcement configurations [16][17][18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of bending properties of Douglas-fir and poplar laminate veneer lumber (LVL) beams with carbon and basalt fibers reinforcement

Rescalvo

Duriot

Pot

et al. 2020

Construction and Building Materials

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This paper presents the experimental results of the bending mechanical behavior (static and dynamic moduli, and maximum stress) of LVL (Laminated Veneer Lumber) beams reinforced with fiber polymer material (FRP). Different variables were studied: i) Wood species (Douglas fir or poplar); ii) Type of reinforcement (bidirectional carbon, unidirectional carbon or basalt); iii) Veneer quality and iv) Veneers orientation in the beam (flatwise or edgewise). The reinforcement percentages respect to the total cross-section was of 2.17%, 0.89% and 1.74% for the unidirectional carbon, bidirectional carbon and basalt, respectively. A clear improvement provided by unidirectional carbon has been demonstrated (up to 40% more in the elastic modulus for the flatwise layout and more than 20% of the maximum stress, for both wood species). The influence of the quality of the veneers of the panel was also clearly demonstrated: the weakest wood material obtained the greatest improvements in their mechanical properties when reinforced, allowing to obtain stiff second quality poplar LVL, or strong second quality Douglas fir LVL.

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Evaluation of Mechanical Properties of Reinforced Poplar Laminated Veneer Lumber

Cited by 16 publications

References 14 publications

Reactions with Wood Carbohydrates and Lignin of Citric Acid as a Bond Promoter of Wood Veneer Panels

Reactions with Wood Carbohydrates and Lignin of Citric Acid as a Bond Promoter of Wood Veneer Panels

MUF Resins Improved by Citric Acid as Adhesives for Wood Veneer Panels

Enhancement of bending properties of Douglas-fir and poplar laminate veneer lumber (LVL) beams with carbon and basalt fibers reinforcement

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