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Effects of Cryogenic Treatment on Shear Strength and Mechanical Properties of Bamboo Laminated Lumber

HUANG Zhi-wei;GUAN Ming-jie;Nanjing Forestry University;  
In order to develop bamboo-based composites under extremely low temperature,the changes in bonding strength and mechanical properties of bamboo laminated lumber under cryogenic treatment were studied. Using the bleached and carbonized bamboo strips as materials,and phenol formaldehyde modified with larch thanaka and urea as adhesive,2-ply bamboo laminated lumbers were made in the assemble pattern of inner to inner and outer to outer. Before and after the cryogenic treatment,the shear strength,modulus of rupture,and modulus of elasticity were measured. The results showed that shear strength,modulus of rupture and modulus of elasticity increased by 9%- 34%,3. 6%- 6. 8%,3. 6%- 7. 9%respectively,indicating that the bamboo laminated lumber has the good application prospect under extremely low temperature.
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