Laminated veneer lumber poles for use in temporary soil nailing. Investigation of adhesive properties.

  • Within a current research-project the possibility of using laminated veneer lumber beech wood poles as temporary soil anchors in foundation engineering is investigated. Within this project adhesive properties of laminated veneer lumber beech wood poles are determined. For use in temporary ground applications the influence of veneer bending, veneer thickness and intensive cement contact is concerned. As standard version two different adhesive systemsmelamine formaldehyde resin (MUF) and a 1-component polyurethane adhesive (PUR) were investigated and compared. Melamine formaldehyde resin glued samples with 3 mm thick veneers and 1.0N/mm² press force show a higher tensile shear strength but also a higher adhesive failure percentage than polyurethane glued samples. In case of melamine formaldehyde resins the closed time has a great influence on bond line quality. A long closed time reveals a low penetration of adhesive in the cells and a low embedding on the wood surface. For curved structures best results were achieved with a bonding pressure of 1.0 N/mm². A significant difference in strength between the concerned MUF and PUR adhesive system was not recognized.

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Author:Sebastian Hirschmüller, Johann Pravida, Roman Marte, Michael Flach
Parent Title (English):Holzbau Forschung und Praxis. 6. Doktorandenkolloqium 2016
Editor: Universität Stuttgart
Document Type:Conference Proceeding
Publication Year:2016
Tag:Laminated veneer; Temporary soil nailing; Timber engineering
faculties / departments:Fakultät für Holztechnik und Bau
Forschung und Entwicklung
Dewey Decimal Classification:6 Technik, Medizin, angewandte Wissenschaften / 62 Ingenieurwissenschaften / 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten