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首页> 外文会议>RILEM conference"Joints in Timber Structures" >Finger Jointing of Freshly Sawn Norway Spruce Side Boards - A Comparative Study of Fracture Properties of Joints Glued with Phenol-Resorcinol and One-Component Polyurethane Adhesive
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Finger Jointing of Freshly Sawn Norway Spruce Side Boards - A Comparative Study of Fracture Properties of Joints Glued with Phenol-Resorcinol and One-Component Polyurethane Adhesive

机译：手指关节新锯挪威云杉侧板 - 用苯酚 - 芳丙烯酚和单组分聚氨酯粘合剂粘合的关节断裂性能的对比研究

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摘要

Finger jointing of unseasoned Norway Spruce was studied with respect to tensile strength, adhesive penetration and durability. Finger joints were manufactured with 1) unseasoned wood and one component polyurethane (PUR) adhesive, 2) dried wood and PUR adhesive and 3) dried wood and phenol resorcinol formaldehyde (PRF) adhesive. Two levels of wood density were used. The tensile strength of the finger joints was determined and the deformations within the joint were studied with an optical measurement system (ARAMIS). The penetration of the adhesive was studied with x-ray microtomography. The durability of the joints was determined according to the standard ASTM D 4688. The results show that the tensile strength and the durability of green glued finger joints are on the same level as that of dry glued PUR joints. The penetration of the PUR adhesive is high in the unseasoned wood and cavities within the bonds seem to be smaller than in dry glued PUR joints. The tensile strength of the finger joints is dependent on density, independent on the adhesive system used. The strength of the green glued PUR adhesive bonds in finger joints measured with small scale specimens did not differ from the strength of the dry glued PUR bonds.
机译：针对拉伸强度，粘合剂渗透和耐久性研究了无若干挪威云杉的手指连接。手指接头用1）不合时宜的木材和一种组分聚氨酯（PUR）粘合剂，2）干木材和PUR粘合剂，3）干木质和苯酚共聚单醛甲醛（PRF）粘合剂。使用两种水平的木质密度。测定指点的拉伸强度，并用光学测量系统（Aramis）研究关节内的变形。用X射线显微镜图研究了粘合剂的渗透。接头的耐久性根据标准ASTM d 4688.结果表明，拉伸强度和绿色胶合手指关节的耐久性是在同一水平上作为干的胶合接头PUR确定。 PUR粘合剂的渗透在未被挑选的木材中高，粘合内的空腔似乎小于干粘合的pur关节。手指接头的拉伸强度取决于密度，独立于所用的粘合剂系统。用小规模标本测量的手指接头中的绿色胶合PUR粘合剂键的强度与干燥胶合粘合剂的强度不同。

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