Developing Laminated Strand Lumber (LSL) based on underutilized Hungarian wood species

Bejó, László és Alpár, Tibor László és Altaher Omer Ahmed, Ahmed (2024) Developing Laminated Strand Lumber (LSL) based on underutilized Hungarian wood species. In: 11TH HARDWOOD CONFERENCE PROCEEDINGS : Sopron, Hungary, 30-31 May 2024. Hardwood conference proceedings . Soproni Egyetem Kiadó, Sopron, pp. 475-480. ISBN 9789633345184

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Absztrakt (kivonat)

The demand for wood-based construction materials is increasing, and the current supply of softwood from Austria and Germany is likely to run out in the coming years. At the current rate of production, the supply of traditionally used softwood raw materials is unsustainable. In addition, the warming climate is making it more difficult to grow Softwood species such as pines, which are one of the most important raw materials for the wood industry. As a result, there is a need to find alternative tree species that can adapt to the changing climate, and whose technical properties are suitable for use in construction. One potential source of alternative wood is hardwood species from the Carpathian Basin. This study, which is the part of the ERDOLAB (Forest Lab) research project, aims to develop Laminated Strand Lumber (LSL) from underutilized Hungarian hardwood species for use in the construction industry. Several LSL panels were manufactured using poplar strands and MDI adhesive, with dimensions 340x340x35 mm, and 600 to 650 kg/m3 in density. Tests included bending and internal bond strength, as well as water absorption and thickness swelling. Test results show that the experimental LSL meets most of the requirements of the standard for structural building materials, with the exception of tensile strength perpendicular to the plane, which is slightly lower than the required standard. However, all other properties of LSL meet or exceed the requirements of the standard. Therefore, LSL can be considered a suitable material for structural applications with the exception of applications where high tensile strength perpendicular to the plane is required.

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