Song Meijun, Gao Ying, Li Guangyao, Lv Xiaobo, Zhao Yajun, Zhang Xiaoxiong, Luo Hui
School of Civil Engineering, Hebei University of Engineering, Handan, Hebei 056038, P. R. China.
State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao, Hebei 266580, P. R. China.
Langmuir. 2025 May 6;41(17):10818-10830. doi: 10.1021/acs.langmuir.4c05075. Epub 2025 Apr 25.
This study aims to address the increasingly complex environmental demands by enhancing the high-temperature durability of asphalt pavements during service, study on the effect and mechanism of silicon carbide (SiC) ceramic micropowder on the performance of modified asphalt. The rheological properties and modification mechanism of SiC-modified asphalt were analyzed using Saturates, Aromatics, Resins, and Asphaltenes (SARA) fraction analysis, viscosity tests, dynamic shear rheological (DSR) tests, Fourier transform infrared spectroscopy (FTIR), and molecular dynamics (MD) simulations. The results show that SiC ceramic micropowder, with its high specific surface area and rich porous structure, effectively adsorbs the lighter components of asphalt, significantly improving its viscosity and high-temperature stability. Rheological tests demonstrate that SiC ceramic micropowder significantly increases the viscosity and rutting factor of asphalt, with a 34.74% improvement in G*/sin δ at 60 °C, indicating a marked enhancement in high-temperature performance. FTIR spectra confirm that the modification of asphalt by SiC is a physical process, as no new functional groups were formed. MD simulations reveal that the interfacial energy between SiC and asphalt is negative, indicating an attractive interaction between the two phases. The selective adsorption of SiC on the SARA fractions follows the order: aromatics > resins > saturates > asphaltenes, which promotes the aggregation of saturates and aromatics on the SiC surface, altering the composition of asphalt. In conclusion, the interfacial interactions and selective adsorption characteristics of SiC ceramic micropowder significantly enhance the viscosity and high-temperature performance of asphalt. This study provides a theoretical foundation for the practical application of SiC ceramic micropowder in high-temperature asphalt environments and offers valuable insights for its engineering applications.
本研究旨在通过提高沥青路面服役期间的高温耐久性来应对日益复杂的环境需求，研究碳化硅（SiC）陶瓷微粉对改性沥青性能的影响及作用机理。采用饱和烃、芳香烃、树脂和沥青质（SARA）组分分析、粘度测试、动态剪切流变（DSR）测试、傅里叶变换红外光谱（FTIR）和分子动力学（MD）模拟等方法，分析了SiC改性沥青的流变性能和改性机理。结果表明，SiC陶瓷微粉具有高比表面积和丰富的多孔结构，能有效吸附沥青中的轻质组分，显著提高其粘度和高温稳定性。流变测试表明，SiC陶瓷微粉显著提高了沥青的粘度和车辙因子，60℃时G*/sinδ提高了34.74%，表明高温性能有显著增强。FTIR光谱证实，SiC对沥青的改性是一个物理过程，因为没有形成新的官能团。MD模拟表明，SiC与沥青之间的界面能为负，表明两相之间存在吸引相互作用。SiC对SARA组分的选择性吸附顺序为：芳香烃＞树脂＞饱和烃＞沥青质，这促进了饱和烃和芳香烃在SiC表面的聚集，改变了沥青的组成。总之，SiC陶瓷微粉的界面相互作用和选择性吸附特性显著提高了沥青的粘度和高温性能。本研究为SiC陶瓷微粉在高温沥青环境中的实际应用提供了理论基础，并为其工程应用提供了有价值的见解。
