Multi-scale studies on interfacial system compatibility between asphalt and SBS modifier using molecular dynamics simulations and experimental methods
Multi-scale studies on interfacial system compatibility between asphalt and SBS modifier using molecular dynamics simulations and experimental methods
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DOI：
10.1016/j.conbuildmat.2022.128502
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发表时间：
2022-09
影响因子：
7.4
通讯作者：
X. Yao;Chixuan Li;Tao Xu
中科院分区：
文献类型：
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作者：
X. Yao;Chixuan Li;Tao Xu
为了了解丁苯橡胶(SBS)改性剂与沥青的界面性质及其对其相容性的影响，并进一步揭示其相容机理，采用界面能、相对浓度和径向分布函数等指标探讨了沥青与SBS改性剂的界面性质，并在建立的SBS/沥青界面模型的基础上，采用分子动力学方法对其相容性进行了评价。此外，还对在160℃、170℃、180℃和190℃下制备的SBS改性沥青样品进行了激光扫描共聚焦显微镜(LSCM)和扫描电子显微镜(SEM)测试，以研究沥青与SBS改性剂之间的相容性。结果表明，在170℃制备温度下，沥青与SBS改性剂的相容性较好，此时沥青与SBS改性剂之间的界面能大于其他三种制备温度下的界面能。在170℃的制备温度下，芳烃与SBS改性剂之间的相互作用和聚集作用更加明显，从而促进了体系的相容性。此外，芳烃和饱和物都有利于沥青与SBS改性剂的相容性，而沥青质则相反。最后，建议采用高芳烃、低沥青质沥青来改善沥青与SBS改性剂的界面性能及与SBS改性剂的相容性，从而制备出高性能的SBS改性沥青。
To understand the interfacial property and its effect on the compatibility between styrene–butadienestyrene (SBS) modifier and asphalt, as well as to further reveal their compatibility mechanism, the indexes of interfacial energy, relative concentration, and radial distribution function were used to discuss the interfacial property between asphalt and SBS modifier, as well as to evaluate the compatibility based on the established SBS/asphalt interface model using molecular dynamics (MD) method. Moreover, the laser scanning confocal microscope (LSCM) and scanning electron microscope (SEM) tests were also conducted on SBS modified asphalt samples prepared at the temperatures of 160 °C, 170 °C, 180 °C and 190 °C to study the compatibilities between asphalt and SBS modifier. Results indicate that the compatibility between asphalt and SBS modifier is better at the preparation temperature of 170 °C. At this point, the interfacial energy between asphalt and SBS modifier is larger than those at the other three preparation temperatures. Also, the compatibility at the preparation temperature of 170 °C is promoted by the more obvious interaction and aggregation between aromatics and SBS modifier. Additionally, both aromatics and saturates are conductive to the compatibility between asphalt and SBS modifier, while the asphaltenes are inverse. Finally, asphalt with high-content aromatics and low-content asphaltenes is proposed to use for improving the interfacial property and the compatibility between asphalt and SBS modifier, so as to prepare a high-performance SBS modified asphalt.