Abstract:

The contributivity of solid wood properties to LVL strength can measure how much LVL strength is originated from solid wood properties.The proportion of end-use selection and their difference values, which were calculated by contributivity between solid wood and LVL, were used to judge the enduse selection of plantation poplar as solid wood or LVL in this paper.The results showed that the different values of Poplar 69, Poplar 72, Poplar 63 were 57 %, -15 %, -29 %, respectively, and indicated that Poplar 69 was suitably used in solid wood, Poplar 63 and Poplar 72 in LVL.When 3 kinds of LVL were assembled with veneers of 3.565 mm, 2.614 mm and 1.545 mm in thickness, their differences were 43 %, -13 %, -43 %, respectively.These indicated that poplar was suitably used in solid wood compared with LVL with thick veneers, but in LVL compared with LVL with thin veneers.In addition to all of 6 properties, poplar was suitably used in solid wood to the properties of shear strength, modulus of elasticity and impact toughness because of their positive differences, but in LVL to the properties of modulus of rupture, compressive strength and hardness because of their negative differences.

Key words: Poplar, End-use selection, Solid wood, Laminated veneer lumber(LVL), Contributivity, End-use proportion