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采用原子力显微镜技术(AFM)的轻敲和力曲线模式,在微观尺度下对沥青与矿料表面的二维图像和三维形貌信息进行采集和分析,并测试和计算表征材料物理黏结特性的表面能。测试和分析结果显示,不同油源的沥青具有明显不同的化学组分和表面粗糙度,具有蜂形结构的沥青表面粗糙度更大。老化将明显减少沥青的表面粗糙度,降低其表面能,进而对沥青与矿料的黏附产生不利影响。结合宏观的黏附拉拔力学试验,对沥青和矿料表面粗糙度、表面能与宏观拉拔强度间的关联进行统计分析。结果表明,对于含蜂形结构的沥青,沥青和矿料表面粗糙度对黏附力学性能较为重要;而对于不含蜂形结构的沥青,其与矿料的黏附性更决定于所选材料的表面能,即两种材料间的物理黏结作用。
The tapping and force curves of atomic force microscopy (AFM) were used to collect and analyze the two-dimensional images and three-dimensional topography information of asphalt and mineral aggregate surface at the microscopic scale. The surfaces that characterize the physical bonding properties of materials were tested and calculated. can. The results of testing and analysis show that bitumen with different oil sources have significantly different chemical compositions and surface roughness, and bitumen with bee-shaped structure has a greater surface roughness. Aging will significantly reduce the surface roughness of asphalt and reduce its surface energy, which will adversely affect the adhesion of asphalt and mineral aggregate. Combined macroscopic adhesion pullout mechanics test, the correlation between surface roughness and surface energy and macro-drawing strength of asphalt and mineral was statistically analyzed. The results show that the surface roughness of bitumen and mineral is more important for the mechanical properties of bitumen with bee-like structure, while the adhesion to bauxite is more dependent on the surface of the selected material Can, that is, the physical bonding between the two materials.