为进一步推动直植式SBS改性沥青研究的发展,本文分析了直接对植物SBS改性剂的发展。从物质组成和作用机理出发,常见的直接对植物SBS改性剂进行了分析,并根据其作用机理分为四类,包括即时溶解原则,分子内润滑原理,非造粒原理,和硫化原理。从改性效果的评价来看,总结了直接入厂SBS改性沥青性能的研究方法,包括荧光显微镜,AFM技术,分子动力学模拟技术。从实际应用的角度来看,论述了直接入厂SBS改性沥青的施工工艺,包括设计阶段,原料准备阶段,配合比设计阶段,和现场施工阶段。结果表明,常见的直接对植物SBS改性剂主要是具有小粒径(小于200目)或特定模型的SBS,辅以添加剂(EVA,环烷油,硫磺,石油树脂,等。),提高熔化效率和润滑性或使其经历硫化反应,改变沥青组分的比例,提高稳定性。在评价直植式SBS改性沥青的改性效果时,通过观察干混合后的颗粒残留物来确定直接对植物SBS改性剂的差异。用改性沥青和改性沥青混合料的宏观指标来确定直植SBS改性剂与沥青的交联效果,并在微观水平上评价了湿法SBS改性剂的改性机理和改性效果。直植式SBS改性沥青的开发应结合直植式SBS改性剂的特点和现场应用的属性,有针对性的研究,以及开发适用于不同地区的高性能直植SBS改性剂和完整生产技术,加强改性效果评估的改进,形成完整的理论体系。
To further promote the development of research on direct-to-plant SBS-modified asphalt, this article analyzes the development of direct-to-plant SBS modifiers. Starting from the material composition and mechanism of action, common direct-to-plant SBS modifiers were analyzed and classified into four categories based on their mechanism of action, including the instant dissolution principle, intramolecular lubrication principle, non-granulation principle, and vulcanization principle. From the evaluation of the modification effect, the method of studying the performance of direct-to-plant SBS-modified asphalt is summarized, including fluorescence microscopy, AFM technology, and molecular dynamics simulation technology. From the perspective of practical application, the construction process of direct-to-plant SBS-modified asphalt was discussed, including the design stage, raw material preparation stage, mix design stage, and on-site construction stage. The results show that common direct-to-plant SBS modifiers are primarily SBS with a small particle size (less than 200 mesh) or specific model, supplemented by additives (EVA, naphthenic oil, sulfur, petroleum resin, etc.), which improve melting efficiency and lubricity or make it undergo vulcanization reaction, change the proportion of asphalt components, and improve stability. In the evaluation of the modification effect of direct-to-plant SBS-modified asphalt, the disparity of the direct-to-plant SBS
modifier is determined by observing the particle residue after dry mixing. Macroscopic indexes of modified asphalt and modified asphalt mixture are used to determine the cross-linking effect of direct-to-plant SBS
modifier and asphalt, and the modification mechanism and modification effect of wet SBS
modifier are evaluated at the microscopic level. The development of direct-to-plant SBS-modified asphalt should combine the characteristics of direct-to-plant SBS modifiers and the attributes of field application, targeted research, and the development of high-performance direct-to-plant SBS modifiers and complete production technologies applicable to different regions, strengthen the improvement of modification effect evaluation, and form a complete theoretical system.