The Aging Properties of Bamboo-Poplar Composite Oriented Strand Board with Different Hybrid Ratios

摘要

In this paper, the bamboo-poplar composite oriented strand board(OSB) with different hybrid ratios were aged under the standard of ASTM D1037 to evaluate its weathering performances. The thickness swelling(TS), water absorption, modulus of rapture in perpendicular direction(MOR_┴), modulus of elasticity in perpendicular direction (MOE_┴) and internal bonding (IB) of specimens were tested. The results showed that the reduction rate of TS ranged from 21% to 69%, which increased with the poplar ratio increasing; the growth multiple of 24h water absorption of bamboo-poplar composite OSB were at the similar level, the values of which were much smaller than that of the pure bamboo or poplar OSB; the maximum and minimum retention rate of MOR_┴ and MOE_┴ belonged to pure bamboo and poplar OSB respectively, retention rate of MOR_┴ of the bamboo-poplar composite OSB rose with the increment of poplar ratio, while retention rate of MOE_┴ and IB of bamboo-poplar composite OSB were similar and the hybrid ratio 2.5:7.5(bamboo: poplar) obtained the maximum IB retention rate of 16%. Through detailed comparison, the bamboo-poplar composite OSB with the hybrid ratio 2.5:7.5 performed the best after aging.