ABSTRACT

Wood is one of the most important building materials. During the service life of wood and derived materials, various degradation factors affect performance. To assess how weathering influenced the material resistance and moisture dynamics of wood, 11 different materials were exposed to natural weathering for 9, 18 and 27 months or artificial accelerated weathering. Afterwards, the moisture performance of wood was determined in line with the Meyer-Veltrup procedure. Weathered samples were also exposed to the brown-rot fungus Gloeophyllum trabeum for 16 weeks. Respective materials were classified into durability classes according to EN 350, and relative resistance dose (D_{rd rel}) was calculated. Weathering resulted in leaching of biologically active extractives, changed surface morphology and increased permeability. All these changes were reflected in decreased relative resistance dose for all tested materials. The largest deceases were determined for thermally modified wood, Scots pine, European larch and sweet chestnut heartwood.

摘要

木材是最重要的建筑材料之一。在木材和衍生材料的使用寿命期间，各种退化因素会影响性能。为了评估风化如何影响木材的材料抵抗力和水分动力学，将 11 种不同的材料暴露于自然风化 9、18 和 27 个月或人工加速风化。然后，根据 Meyer-Veltrup 程序确定木材的水分性能。风化样品也暴露于褐腐真菌Gloeophyllum trabeum 16 周。根据 EN 350 和相对电阻剂量 ( D _{rd rel}) 计算得出。风化导致生物活性提取物浸出、表面形态改变和渗透性增加。所有这些变化都反映在所有测试材料的相对电阻剂量降低上。死亡人数最多的是热改性木材、欧洲赤松、欧洲落叶松和甜栗心材。