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相关概念视频

Wood Products01:21

Wood Products

79
Wood products encompass a broad range of materials crafted from wood strands, veneers, lumber, and even waste wood-like shreds, designed for both structural and nonstructural purposes. Various specialized wood products have been developed to enhance strength, durability, and versatility in building applications.
Glue-laminated wood, often referred to as glulam, combines multiple smaller pieces of dimensional lumber using adhesives to form a single, larger piece. Cross-laminated timber consists...
79
Introduction to Wood01:19

Introduction to Wood

210
Wood, derived from trees, is a versatile and widely used construction material. Trees feature a trunk surrounded by a protective layer of dead bark. Beneath this outer layer lies the living bark, followed by the cambium, and then the sapwood which transitions into heartwood as it matures. At the center of the trunk is the pith. The age of a tree can be discerned by examining its growth rings, which are concentric bands visible in the trunk's cross-section.
The structural integrity of the...
210
Wood Panel Products01:18

Wood Panel Products

70
Wood panel products are essential materials used in construction for applications such as flooring, siding, and roofing, typically available in standard dimensions of 4 feet by 8 feet, with thicknesses varying from one-quarter of an inch to one and one-eighth inches. Among the most common types of wood panels is plywood, which is produced by gluing multiple layers of thin wood veneers under pressure. The grain of the outer veneers runs lengthwise, while the grains of the interior layers run...
70
Wood Surfacing01:14

Wood Surfacing

88
Wood surfacing is a critical finishing process designed to smoothen the wood surface, enhance its dimensional accuracy, and make handling safer. This process compensates for potential shrinkage during the seasoning phase by marginally increasing the wood dimensions before surfacing. It also helps correct some distortions that may occur as the wood dries.
The equipment used in the surfacing process is a plane equipped with rotating blades. This tool efficiently smoothens the wood surface and can...
88
Softwoods and Hardwoods01:28

Softwoods and Hardwoods

149
Softwoods and hardwoods, derived from different types of trees, are distinguished by their leaf structures and cellular compositions, each serving unique purposes in construction and manufacturing. Softwoods come from cone-bearing trees with needle-like leaves and are predominantly composed of longitudinal cells called tracheids and a smaller proportion of radial cells known as rays. Due to their cellular structure, softwoods are commonly used in construction for structural frames, sheathing,...
149
Structural Properties and Dimensions of Lumber01:21

Structural Properties and Dimensions of Lumber

80
Wood's structural properties derive from fibers aligned along the tree's length, contributing significantly to its mechanical strength. Wood exhibits up to twenty times greater tensile strength along these fibers compared to across them, and generally shows better performance under compression than tension. The length of fibers varies, with hardwoods having fibers around one twenty-fifth inch long and softwoods ranging from one-eighth to one-third inch.
The strength characteristics of...
80

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在工程木材中使用木材废料和生物聚氨形成结构.

Aurelija Rimkienė1, Agnė Kairytė1, Sigitas Vėjelis1

  • 1Building Materials Institute, Faculty of Civil Engineering, Vilnius Gediminas Technical University, Linkmenu str. 28, LT-08217 Vilnius, Lithuania.

Materials (Basel, Switzerland)
|August 29, 2024
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概括

这项研究探讨了再利用木材废弃物来制造强大的工程木材用于建筑的日志. 化学处理增强了木材废弃物特性,显著增加了可持续建筑材料的抗拉强度.

关键词:
散装密度 散装密度 散装密度压力压力压力是压力压力的压力.工程木材是工程木材的产品.颗粒度组合的组成微观结构的微观结构拉力强度 拉力强度是什么木材废弃物:木材废弃物是一种废弃物.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 可持续工程 可持续工程
  • 木材科学 木材科学 木材科学

背景情况:

  • 木材废弃物对处置具有重大挑战.
  • 工程木制品为传统木材提供可持续的替代品.
  • 从废弃物中开发高强度木材复合材料对于建筑业至关重要.

研究的目的:

  • 调查在工程木材日志中再利用木材废弃物的加工方法.
  • 评估这些日志是否符合结构性木材强度要求.
  • 评估化学处理对木材废弃物特性和粘合剂粘合的影响.

主要方法:

  • 三种木材废弃物类型的表征 (包装,建筑/家具,门制造).
  • 对粒子大小,形状和表面微观结构的分析.
  • 用生物聚氨粘合剂粘合木质颗粒并评估粘合力.
  • 木材颗粒的化学处理 (碳酸,高酸,过氧化物).
  • 工程木材日志的拉伸和压力强度测试.

主要成果:

  • 化学处理使填充剂的重量减少了高达30%.
  • 用碳酸处理的包装废物的工程木材的拉力强度从8331增加到12702kPa.
  • 处理对拉伸强度的影响因使用的化学溶液而变化.
  • 压力强度被确定以评估整体结构完整性.

结论:

  • 木材废弃物可以有效地被加工成工程木材用于建筑.
  • 化学表面处理提高了木材废弃物颗粒与生物聚氨粘合剂的粘合.
  • 优化处理可以显著改善机械性能,满足结构性木材标准.