The project proposal aims to increase the use of less utilized hardwoods in sustainable construction and to promote the use of environmentally friendly materials and technologies. Due to climate change, which leads to higher average air temperatures and extreme weather conditions, the composition of forests is changing and tending towards a greater proportion of deciduous trees (hardwood). As a result, more hardwood will have to be used for the production of wood-based composites in the near future. The lack of knowledge and standardization regarding the production process, quality control and structural design, restricts wider use of hardwood in construction, which is why basic research on the bonding of these wood species is crucial. Most adhesive systems for structural bonding are designed for softwoods, which can lead to unsuitable joints when bonding hardwoods or combinations of hardwood and softwood species (hybrid system). Significant problems can occur in delamination tests due to unfavourable shrinkage and swelling caused by different dimensional changes due to moisture changes. A major focus is on improving adhesion through innovative surface pre-treatment of wood lamellas using plasma and laser technologies. The project will evaluate and optimize a process for pre-treatment of wood lamellas using non-thermal dielectric barrier discharge plasma and laser techniques. It will determine and explain the influence of surface pre-treatment on adhesion when bonding different combinations of wood species with structural adhesives. The final goal is to develop and optimize a hybrid glued laminated timber (glulam) whose bonding and bending properties are comparable to those of a conventional glulam.

Keywords
Adhesion, bonding, hardwood, hybrid glued laminated timber, laser treatment, plasma treatment, surface properties, stiffness, strength, sustainable construction

25-20009L

English

Vaněrek Jan, doc. Ing., Ph.D. - principal person responsible
Laciková Petra, Ing. - fellow researcher
Šmak Milan, doc. Ing., Ph.D. - fellow researcher

Institute of Technology of Building Materials and Components
- responsible department (11.1.2024 - not assigned)
Institute of Technology of Building Materials and Components
- beneficiary (11.1.2024 - not assigned)

Responsibility: Vaněrek Jan, doc. Ing., Ph.D.