Zhou Shuo, Wang Dengfeng, Wu Liuxing, Maimaitisidike Alimire, Wang Zhiqing, Zhao Hongbo, Ren Jiaolong
School of Civil Engineering and Geomatics, Shandong University of Technology, Zibo 255000, China.
Zhumadian Transportation Construction Technology Center, Zhumadian 463000, China.
Materials (Basel). 2025 Apr 10;18(8):1731. doi: 10.3390/ma18081731.
Styrene-butadiene-styrene (SBS)-modified asphalt, a widely utilised binder in pavement engineering, is susceptible to ageing due to the coupling effects of thermo-oxidation, ultraviolet radiation, and humidness. Due to the limited availability of high-quality asphalt resources, recycling aged asphalt has emerged as a vital strategy for addressing resource shortages and reducing environmental pollution. This study investigated the effects of thermal-ultraviolet-humidness coupled ageing on the pavement performance of SBS-modified asphalt, with a specific focus on the hot-wet climates of Guangzhou and Chengdu. Beijing's standard climate serves as a reference for this study. Additionally, industrial animal oil was chosen as a rejuvenator for aged SBS-modified asphalt. The mechanisms underlying hot-wet coupling ageing and regeneration of SBS-modified asphalt were analysed using Fourier Transform Infrared Spectroscopy (FTIR) and Fluorescence Microscopy (FM). The findings indicate that thermal-oxidation and humidness accelerate sulphide formation, resulting in a marked increase in sulfoxide groups and facilitating the migration of lighter components, ultimately leading to asphalt hardening. Under high-temperature and humidness conditions, the butadiene index (BI) of asphalt decreased by 5.96% in Chengdu and 15.78% in Guangzhou compared to Beijing. The sulfoxide index (SI) and aromaticity index (CI) increased by 3.74% and 3.89% in Chengdu, and by 9.39% and 8.54% in Guangzhou, respectively, confirming the exacerbating effect of humidness on ageing. During the regeneration process, industrial animal oil effectively diluted polar molecules in aged asphalt, resulting in reductions in SI by 38.88%, 36.74%, and 37.74%, and in CI by 63.77%, 62.54%, and 63.11% under ageing conditions in Beijing, Guangzhou, and Chengdu, respectively. Rejuvenation is achieved by replenishing lighter components, thereby promoting the aggregation and swelling of the degraded SBS chains.
苯乙烯-丁二烯-苯乙烯（SBS）改性沥青是路面工程中广泛使用的一种粘结料，由于热氧化、紫外线辐射和湿度的耦合作用，容易老化。由于优质沥青资源有限，回收老化沥青已成为解决资源短缺和减少环境污染的一项重要策略。本研究调查了热-紫外线-湿度耦合老化对SBS改性沥青路面性能的影响，特别关注广州和成都的湿热气候。北京的标准气候作为本研究的参考。此外，选择工业动物油作为老化SBS改性沥青的再生剂。使用傅里叶变换红外光谱（FTIR）和荧光显微镜（FM）分析了SBS改性沥青的热湿耦合老化和再生机制。研究结果表明，热氧化和湿度加速了硫化物的形成，导致亚砜基团显著增加，并促进了轻质组分的迁移，最终导致沥青硬化。在高温和湿度条件下，与北京相比，成都沥青的丁二烯指数（BI）下降了5.96%，广州下降了15.78%。成都的亚砜指数（SI）和芳香度指数（CI）分别增加了3.74%和3.89%，广州分别增加了9.39%和8.54%，证实了湿度对老化的加剧作用。在再生过程中，工业动物油有效地稀释了老化沥青中的极性分子，在北京、广州和成都的老化条件下，SI分别降低了38.88%、36.74%和37.74%，CI分别降低了63.77%、62.54%和63.11%。通过补充轻质组分实现再生，从而促进降解的SBS链的聚集和溶胀。
