当前位置: X-MOL 学术Eur. J. Wood Prod. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Use of northern hardwoods in glued-laminated timber: a study of bondline shear strength and resistance to moisture
European Journal of Wood and Wood Products ( IF 2.6 ) Pub Date : 2020-07-25 , DOI: 10.1007/s00107-020-01572-3
Alexandre Morin-Bernard , Pierre Blanchet , Christian Dagenais , Alexis Achim

The growing demand for engineered wood products in the construction sector has resulted in the diversification of the product offer. Used marginally in structural products in North America, northern hardwoods are now attracting a growing interest from industry and policy makers because of their outstanding strength as well as their high availability and distinctive appearance. Currently, there is no standard in Canada governing the use of hardwoods in the manufacturing of glued-laminated timber. As part of a larger project aiming to assemble the basic knowledge that would lead to such standard, the specific objective of this study was to assess the shear strength in dry and wet conditions of assemblies made from different hardwood species and structural adhesives. Results suggest that a mean shear strength as high as 20.5 MPa for white oak, 18.8 MPa for white ash and respectively 18.2 MPa and 17.4 MPa for yellow birch and paper birch can be obtained in dry conditions. The choice of adhesive did not affect the dry shear strength of these specimens, but differences were observed in wet conditions. Specimens bonded with melamine-formaldehyde adhesive had generally the highest wet shear strength and wood failure values. These results also highlight the important influence of wood density on the percentage of failure that occurs in wood and, to a lesser extent, on shear strength. Further investigations on finger joint strength and full-size bending tests will allow confirming the potential for the investigated species to be used in glued-laminated timber.



中文翻译:

北方硬木在胶合层压木材中的使用:粘结线剪切强度和耐湿性的研究

建筑领域对工程木产品的需求不断增长,导致产品种类多样化。北美硬木由于其出色的强度,高可用性和独特的外观,在北美仅少量用于结构产品,现在引起了行业和政策制定者的越来越多的兴趣。目前,加拿大尚无规范胶合层压木材生产中使用硬木的标准。作为旨在汇总将导致该标准的基础知识的大型项目的一部分,本研究的具体目标是评估由不同硬木和结构胶制成的组件在干燥和潮湿条件下的剪切强度。结果表明,18的白橡木的平均剪切强度高达20.5 MPa。在干燥条件下,白灰分别为8 MPa和黄桦和纸桦分别为18.2 MPa和17.4 MPa。粘合剂的选择不影响这些样品的干剪切强度,但是在潮湿条件下观察到差异。用三聚氰胺-甲醛粘合剂粘合的样品通常具有最高的湿剪切强度和木材破坏值。这些结果也凸显了木材密度对木材中破损率的重要影响,并在较小程度上影响了剪切强度。对手指关节强度和全尺寸弯曲测试的进一步研究将证实所研究物种用于胶合层压木材的潜力。粘合剂的选择不影响这些样品的干剪切强度,但是在潮湿条件下观察到差异。用三聚氰胺-甲醛粘合剂粘合的样品通常具有最高的湿剪切强度和木材破坏值。这些结果也凸显了木材密度对木材中破损率的重要影响,并在较小程度上影响了剪切强度。对手指关节强度和全尺寸弯曲测试的进一步研究将证实所研究物种用于胶合层压木材的潜力。粘合剂的选择不影响这些样品的干剪切强度,但是在潮湿条件下观察到差异。用三聚氰胺-甲醛粘合剂粘合的样品通常具有最高的湿剪切强度和木材破坏值。这些结果也凸显了木材密度对木材中发生破坏的百分比以及在较小程度上对剪切强度的重要影响。对手指关节强度和全尺寸弯曲测试的进一步研究将证实所研究物种用于胶合层压木材的潜力。这些结果也凸显了木材密度对木材中发生破坏的百分比以及在较小程度上对剪切强度的重要影响。对手指关节强度和全尺寸弯曲测试的进一步研究将证实所研究物种用于胶合层压木材的潜力。这些结果也凸显了木材密度对木材中发生破坏的百分比以及在较小程度上对剪切强度的重要影响。对手指关节强度和全尺寸弯曲试验的进一步研究将证实所研究的树种可用于胶合层压木材。

更新日期:2020-07-25
down
wechat
bug