Durability Analysis of Structural Oriented Strandboard Made with Borate-Modified Wood Flakes

定向刨花板(OSB)是一种结构木材复合材料，广泛应用于房屋建筑中，用作护套、地板和工字形托梁材料。作为一种生物材料，OSB容易受到台湾白蚁的攻击，在全国范围内，白蚁每年给房屋造成超过20亿美元的损失。基于硼酸盐的系统已被证明为OSB提供了足够的白蚁保护。然而，化学物质的添加往往会导致OSB的强度和耐久性显著降低。本项目的目标是全面了解添加硼酸盐对OSB强度和长期耐久性的影响。具体目标是：(1)开发用于制造带硼酸改性鳞片的OSB的压制技术；(2)确定添加硼酸盐对板材硬度、强度和稳定性的影响；(3)确定木材鳞片中硼酸锌的含量和微观分布；以及(4)测量和模拟OSB的蠕变行为。在这项工作中，将制造硼酸盐改性的OSB板。将确定板材的强度、化学含量和分布、膨胀和蠕变性能。将开发数学模型来描述观察到的蠕变和耐久性行为。这项工作将导致加工技术和基本耐久性信息的发展，以制造具有良好生物性能的耐久OSB。

Oriented Strandboard (OSB) is a structural wood composite widely used in house construction as sheathing, flooring, and I-joist materials. As a biological material, OSB is subject to attack from Formosan termites, which nationwide cause over $2 billion a year in damages to homes. Borate-based systems have been shown to provide adequate termite protection for OSB. However, the addition of the chemical often leads to a significant reduction in the strength and durability of OSB. The goal of this project is to pursue an overall understanding of the influence of borate addition on OSB's strength and long-term durability. The specific objectives are: (1) To develop pressing technology for manufacturing OSB with borate-modified flakes; (2) To determine the effects of borate addition on panel stiffness, strength, and stability; (3) To determine contents and micro-distribution of zinc-borate within wood flakes; and (4) To measure and model the creep behavior of the OSB. In this work, borate-modified OSB panels will be manufactured. Panel strength, chemical content and distribution, swelling and creep properties will be determined. Mathematical models will be developed to describe observed creep and durability behavior. The work will lead to the development of processing technology and fundamental durability information information for the manufacture of durable OSB with sound biological performance.