ABSTRACT

The objective of this study was to evaluate some mechanical properties of OSB/3 after one to ten cycles of soaking and oven/drying (accelerated aging). The modulus of rupture (MOR), modulus of elasticity (MOE), found by 3-point bending and screw withdrawal load (SWL), were determined in dry and wet conditions in the face and back surface, and in the cutting edge. The specimens were soaked for 24 hours and dried for 48 hours in a ventilated drying box. The MOR, MOE and SWL values dropped significantly after the first cycle, continued to decrease after three cycles and stabilized in the last cycles of soaking and drying. The surface and cross-sections of the samples were also studied using the X-ray technique. This analysis explained a significant decrease in the values of the studied properties after the first soaking cycle as a result of non-restored plastic deformation of the resin matrix. The low retention values of the studied properties could raise the durability issue of the investigated commercial OSB/3 boards as they should be moisture resistant according to EN 300:2006.

摘要

本研究的目的是评估 OSB/3 在浸泡和烘箱/干燥（加速老化）循环 1 到 10 次后的一些机械性能。断裂模量 (MOR)、弹性模量 (MOE) 由 3 点弯曲和螺钉拔出载荷 (SWL) 得出，在干湿条件下测定正面和背面以及切削刃。将试样浸泡 24 小时，然后在通风干燥箱中干燥 48 小时。MOR、MOE 和 SWL 值在第一个循环后显着下降，三个循环后继续下降，并在最后一个浸泡和干燥循环中趋于稳定。还使用 X 射线技术研究了样品的表面和横截面。该分析解释了由于树脂基体未恢复的塑性变形，在第一次浸泡循环后所研究的特性值显着下降的原因。根据 EN 300:2006，所研究的特性的低保留值可能会增加所研究的商用 OSB/3 板的耐久性问题，因为它们应该是防潮的。