Zeng Bing, Wu Shuo, Yao Shufang
CABR Testing Center Company Limited, China Academy of Building Research, Beijing 100013, China.
Materials (Basel). 2025 Jul 25;18(15):3484. doi: 10.3390/ma18153484.
In civil engineering, with the increasing demand for structural reinforcement and renovation projects, polymer-rich anchoring adhesives have attracted much attention due to their performance advantage of having high strength and have become a key factor in ensuring the safety and durability of buildings. In this study, polymer-rich anchoring adhesives underwent three artificial aging treatments (alkali medium, hygrothermal, and water bath) to evaluate their aging performance. Alkali treatment reduced bending strength by up to 70% (sample 5#) within 500 h before stabilizing, while hygrothermal and water-curing treatments caused reductions of 16-51% and 15-77%, respectively, depending on adhesive composition. Dynamic thermomechanical analysis revealed significant loss factor decreases (e.g., epoxy adhesives dropped from >1.0 to stable lower values after 500 h aging), indicating increased rigidity. Infrared spectroscopy confirmed chemical degradation, including ester group breakage in vinyl ester resins (peak shifts at 1700 cm and 1100 cm) and molecular chain scission in unsaturated polyesters. The three test methods consistently demonstrated that 500 h of aging sufficiently captured performance trends, with alkali exposure causing the most severe degradation in sensitive formulations (e.g., samples 5# and 6#). These results can be used to establish quantitative benchmarks for adhesive durability assessment in structural applications.
在土木工程中，随着对结构加固和翻新项目需求的不断增加，富含聚合物的锚固胶粘剂因其高强度的性能优势而备受关注，并已成为确保建筑物安全性和耐久性的关键因素。在本研究中，对富含聚合物的锚固胶粘剂进行了三种人工老化处理（碱性介质、湿热和水浴），以评估其老化性能。在500小时内，碱性处理使弯曲强度在稳定前降低了70%（5#样品），而湿热处理和水养护处理分别导致强度降低16% - 51%和15% - 77%，具体降幅取决于胶粘剂的成分。动态热机械分析表明损耗因子显著降低（例如，环氧胶粘剂在老化500小时后从>1.0降至稳定的较低值），这表明刚性增加。红外光谱证实了化学降解，包括乙烯基酯树脂中酯基的断裂（在1700 cm和1100 cm处的峰位移）以及不饱和聚酯中的分子链断裂。这三种测试方法一致表明，500小时的老化足以捕捉性能趋势，对于敏感配方（如5#和6#样品），碱暴露会导致最严重的降解。这些结果可用于建立结构应用中胶粘剂耐久性评估的定量基准。
