ABSTRACT

During the service life of a Structural Sealant Glazing (SSG) facade, its silicone bond is simultaneously exposed to climatic and mechanical loads. Current durability assessment methods yet schedule separate test programmes for accelerated weathering and mechanical loading. This study presents a durability test that applies mechanical loading and weather cycling simultaneously simulating 50 years of use. Two common structural sealants are tested. The mechanical behaviour of medium-scale system specimens in tension, compression and shear is recorded for performance assessment during exposure. Moduli and dissipated energies show a characteristic decrease, indicating stress relaxation and degradation. Tensile and shear moduli and strengths of sections cut out from the system specimens after exposure are notably reduced by combined loading compared to those of reference and weathered specimens. Differences between performance and durability characteristics of the two sealants are consistent, also regarding supplementary visual inspection and hardness measurements. The approach introduced in this article provides a basis for more comprehensive performance-related durability testing of SSG-systems.

摘要

在结构密封胶玻璃 (SSG) 外墙的使用寿命期间，其有机硅粘合剂同时暴露于气候和机械负载。当前的耐久性评估方法还为加速老化和机械负载安排了单独的测试程序。本研究提出了一项耐久性测试，该测试同时应用机械负载和天气循环，模拟 50 年的使用。测试了两种常见的结构密封剂。记录中等规模系统试样在拉伸、压缩和剪切中的力学行为，以便在暴露期间进行性能评估。模量和耗散能量显示出特征性的降低，表明应力松弛和退化。与参考样品和风化样品相比，组合载荷显着降低了暴露后从系统样品中切出的部分的拉伸和剪切模量和强度。两种密封剂的性能和耐久性特征之间的差异是一致的，在补充目视检查和硬度测量方面也是如此。本文介绍的方法为更全面的 SSG 系统性能相关的耐久性测试提供了基础。