Nečasová Barbora, Liška Pavel
Faculty of Civil Engineering, Brno University of Technology, Veveří 331/95, 60200 Brno, Czech Republic.
Materials (Basel). 2020 Oct 29;13(21):4847. doi: 10.3390/ma13214847.
The presented paper summarizes the main research findings on the impact of the environment concerning the durability and service life of building joint sealants. The focus is placed on sealed joints in façade applications, which can serve different purposes and can also be several meters long which often intensifies the stresses that the joint needs to withstand and therefore its service life can be significantly shortened. Different approaches, test sample geometries and high-performance sealants, were used in this context to determine the most critical aspects for the studied application sector. The research was divided into three phases where the joints were subjected to (I) artificial weathering in a laboratory environment, (II) real weathering in an external environment, and (III) weathering via a real application that was monitored for almost 4 years. The extensive research scope confirmed one commonly known presumption, that standardized artificial weathering/aging methods are not able, from a long-term perspective, to simulate the impact of a real environment. The most valuable results were obtained in the third phase of the research, where the monitoring of a real façade brought to light completely different conclusions. The joints exposed to the real environment were either completely deteriorated or showed signs of advanced aging.
本文总结了关于环境对建筑接缝密封胶耐久性和使用寿命影响的主要研究结果。重点关注外墙应用中的密封接缝，这些接缝可用于不同目的，长度可达数米，这通常会加剧接缝需要承受的应力，从而显著缩短其使用寿命。在此背景下，采用了不同方法、测试样品几何形状和高性能密封胶来确定所研究应用领域中最关键的方面。研究分为三个阶段，在这些阶段中，接缝要经历：（I）实验室环境中的人工老化，（II）外部环境中的实际老化，以及（III）通过实际应用进行老化，该实际应用被监测了近4年。广泛的研究范围证实了一个众所周知的假设，即从长期来看，标准化的人工老化方法无法模拟真实环境的影响。最有价值的结果是在研究的第三阶段获得的，在该阶段对实际外墙的监测得出了完全不同的结论。暴露在真实环境中的接缝要么完全损坏，要么显示出老化加剧的迹象。
