The Preparation of Laminated Timber Based on the Characteristics of Moso Bamboo

Abstract

China ranks first worldwide in rich in bamboo forestry and bamboo production whereby various bamboo composite boards have been developed so far. Meanwhile, it still faces many challenges associated with low lateral strength, poor dimensional stability, and large variability in different parts of bamboo. In this study, special attention was paid to the influence of bonding interface and bamboo pitch properties on the bonding performance of bamboo strips. The effects of 'micro-hole treatment' technology, bamboo pitch, hot pressing conditions and assembly method on the performance of bamboo laminated wood were investigated as well. The response surface analysis method was used to optimize the production of bamboo laminated timber via high temperature heat treatment of 5-year-old bamboo strips at a height of 3 meters from the ground. The results showed that the bonding interface forms (QQ, QH, and HH) exerted no significant impact on the shear strength, bending strength and elastic modulus of glued bamboo strips. Moreover, independently of whether bamboo strips had bamboo nodes or not, they imposed no significant effect on compressive strength and shear strength, but strongly influenced flexural strength, flexural modulus of elasticity and tensile strength of the timber. Besides that, the mechanical properties of non-jointed bamboo strips were superior to those of jointed bamboo strips, and the dislocation distance between adjacent bamboo strips in the range of 3-10 cm was beneficial for the improvement of the mechanical parameters of glued bamboo strips. The preparation process of laminated timber was optimized, which promoted the efficient utilization of bamboo and laid a foundation for the green processing and industrialization development of laminated timber.