Zhang Kai, Zhong Xuwen, Huang Xukun, Wan Weihua, Zhou Hai, Liu Bin
Road Material and Structure Engineering Technology Research Center of Jiangxi Provincial, Jiangxi Communications Investment Maintenance Technology Group Co., Ltd., Nanchang 330200, China.
School of Civil and Architectural Engineering, East China University of Technology, Nanchang 330013, China.
Materials (Basel). 2025 Jun 4;18(11):2643. doi: 10.3390/ma18112643.
Currently, research on the modification mechanisms of activated rubber/SBS (styrene-butadiene-styrene) composites and the microscopic processes involved remains limited. To investigate the impact of the rubber activation treatment combined with SBS modifier on asphalt modification, this study employs composite-modified asphalt formulations using either a conventional mix or activated rubber in conjunction with SBS. Infrared spectroscopy (IR) and scanning electron microscopy (SEM) were utilized to analyze the chemical components and microscopic morphology of the composite-modified asphalt following activation treatment. Microscopic analysis revealed that the asphalt stirred for 20 min has a characteristic peak with a wave number of 966 cm, while the characteristic peak with a wave number of 700 cm is not obvious. That is, the asphalt sample contains the polybutadiene component and a reduced amount of the polystyrene component. Therefore, it can be inferred that the asphalt sample only contains activated rubber, along with less SBS modifier content. Traditional rubber undergoes significant expansion reactions during the mixing stage, but there are difficulties in degradation, which leave large particles and reduce the proportions of the lightweight asphalt components. However, active rubber and SBS mainly expand and degrade more completely during the shear stage, forming many micro-volume particles in asphalt. Additionally, frequency scanning and multiple creep recovery tests were conducted to evaluate the high-temperature rheological properties of the asphalt. The results indicate that activated rubber, doped at 20%, and SBS, doped at 2%, significantly enhance the high-temperature rheological properties of the composite-modified asphalt compared to base asphalt, exhibiting a 417.16% increase in the complex modulus at 64 °C and 1 Hz. Furthermore, these modifiers interact synergistically to improve modification efficiency.
目前，关于活性橡胶/苯乙烯-丁二烯-苯乙烯（SBS）复合材料的改性机理及相关微观过程的研究仍然有限。为了研究橡胶活化处理与SBS改性剂相结合对沥青改性的影响，本研究采用了传统混合或活性橡胶与SBS结合的复合改性沥青配方。利用红外光谱（IR）和扫描电子显微镜（SEM）分析了活化处理后复合改性沥青的化学成分和微观形态。微观分析表明，搅拌20分钟的沥青在波数为966 cm处有特征峰，而波数为700 cm的特征峰不明显。也就是说，该沥青样品含有聚丁二烯成分且聚苯乙烯成分含量减少。因此，可以推断该沥青样品仅含有活性橡胶，SBS改性剂含量较少。传统橡胶在混合阶段会发生显著的膨胀反应，但降解存在困难，会留下大颗粒并降低轻质沥青成分的比例。然而，活性橡胶和SBS主要在剪切阶段更完全地膨胀和降解，在沥青中形成许多微体积颗粒。此外，还进行了频率扫描和多次蠕变恢复试验以评估沥青的高温流变性能。结果表明，与基质沥青相比，20%掺量的活性橡胶和2%掺量的SBS显著提高了复合改性沥青的高温流变性能，在64℃、1Hz时复数模量提高了417.16%。此外，这些改性剂协同作用以提高改性效率。
