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Mechanical Characterisation of Densified Hardwood with Regard to Structural Applications

Journal of Renewable Materials 2020年第9期8卷 1091-1109页

作者： Katharina Müller Walter Sonderegger Oliver Kläusler Michael Klippel Edwin Zea Escamilla Institute of Structural Engineering(IBK) Chair of Structural Engineering–Timber StructuresSwiss Federal Institute of Technology ZurichZurich8093Switzerland Swiss Wood Solutions AG 8600 DübendorfSwitzerlandPreviously at Institute for Building Materials(IfB)Chair of Wood Materials ScienceSwiss Federal Institute of Technology ZurichZurich8093Switzerland College of Civil Engineering Nanjing Forestry UniversityNanjing210037China Sustainable Building Center for Corporate Responsibility and SustainabilityUniversity of ZurichZurich8001Switzerland

The demand for high-performance,yet eco-friendly materials is increasing on all scales from small applications in the car industry,instrument or furniture manufacturing to greater dimensions like floorings,balcony furnishings and even *** offers a good choice on all of these scales and can be modified and improved in many different *** this study,two common European hardwood species,Beech(Fagus sylvatica L.)and Ash(Fraxinus excelsior L.)were densified in radial direction by thermo-mechanical treatment and the densified product was investigated in an extensive characterisation series to determine all relevant mechanical *** in the three main directions(longitudinal,tangential,radial)and tension perpendicular to the grain(tangential,radial)were tested and compared to reference specimens with native *** and modulus of elasticity were determined in all *** addition,a Life Cycle Assessment was carried out to evaluate the environmental impact associated to the densification *** experimental investigations showed that strength and stiffness of hardwood in the longitudinal and tangential directions improve significantly by radial densification,whereas some properties in the radial direction *** Life Cycle Assessment showed that artificial wood drying has higher impact than wood ***,the transport distance of the raw material highly influences the environmental impact of the final densified *** paper then also offers an overview of possible applications in structural timber *** hardwood is a viable option as local reinforcement,where high compressive or tensile strength is *** wood densification process offers an alternative to the use of carbon-intense steel components or hardwoods from tropical forests.

关键词： Hardwood densification high-performance construction materials thermo-mechanical treatment mechanical characterisation life cycle assessment timber structures

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