Wang Juanjuan, Li Xian, Sun Guojun, Ma Xingpeng, Du Hongwei
China Electronics Engineering Design Institute Co., Ltd., Beijing 100142, China.
China Electricity Council, Beijing 100761, China.
Polymers (Basel). 2024 Sep 13;16(18):2593. doi: 10.3390/polym16182593.
With global warming in recent years, extreme weather conditions have increased in frequency and intensity, exacerbating the challenges for waterproofing materials. The current stages of SBS asphalt waterproofing membrane aging research mainly focus on the raw materials and modifiers in a single factor; multifactor-coupled aging research is less studied. This study focused on the coupled aging characteristics of SBS-modified asphalt waterproofing membranes, aiming to reveal the mechanism of its influence on the material's performance under the environmental effects of high temperature and freeze-thaw. Through the accelerated aging test, we simulated the environmental conditions of high temperature in summer and freeze-thaw in winter to observe the mechanical properties of waterproofing membranes, low-temperature flexibility, and apparent phenomena. Then, Fourier transform infrared spectroscopy (FTIR) evaluated the performance and chemical structure of SBS-modified asphalt waterproofing membranes after aging by the coupled aging of the thermo-oxidative freeze-thaw cycle. The results showed that the low-temperature flexibility of the waterproofing membranes was significantly reduced after the coupled aging effect, and, at the same time, their tensile strength was also reduced. However, despite the tensile properties being impaired, the membrane maintained good ductility, and its elongation at break did not fall below 47%.
近年来，随着全球气候变暖，极端天气状况的发生频率和强度都有所增加，这加剧了防水材料面临的挑战。目前SBS 沥青防水卷材老化研究阶段主要集中在单一因素的原材料和改性剂方面；多因素耦合老化研究较少。本研究聚焦于SBS 改性沥青防水卷材的耦合老化特性，旨在揭示其在高温和冻融环境作用下对材料性能的影响机制。通过加速老化试验，模拟夏季高温和冬季冻融的环境条件，观察防水卷材的力学性能、低温柔韧性及表观现象。然后，利用傅里叶变换红外光谱（FTIR）对经热氧化冻融循环耦合老化后的SBS 改性沥青防水卷材的性能和化学结构进行评估。结果表明，耦合老化作用后防水卷材的低温柔韧性显著降低，同时其拉伸强度也有所下降。然而，尽管拉伸性能受损，但卷材仍保持良好的延展性，其断裂伸长率不低于47%。
