ABSTRACT

Poplar is a common tree species that is extensively cultivated in China, and its density is relatively low. The low density of poplar results in low mechanical properties, which restrict its application range. However, the density of wood can be increased by compressing the porous structure in the transverse direction. Before compression, the wood needs to be softened from a rigid state to a thermoplastic flow state. After compression, the compressive deformation needs to be fixed. The hot water pretreatment and heat post-treatment is by far the most convenient and environment-friendly way for the manufacture of the densified wood. This study presents the mechanical properties of densified poplar by hot water pretreatment with different compression ratio and thermal modification time, and explores the engineering application potential of densified poplar as wooden dowel to connect timber members instead of steel dowel.

摘要

杨树是我国广泛栽培的常见树种，密度较低。杨木密度低，力学性能低，限制了其应用范围。然而，可以通过在横向压缩多孔结构来增加木材的密度。在压缩之前，木材需要从刚性状态软化到热塑性流动状态。压缩后，需要固定压缩变形。热水预处理和热处理是目前制造密实木最方便、最环保的方法。本研究介绍了通过不同压缩比和热改性时间的热水预处理致密杨树的力学性能，