Yan Tianhao, Ingrassia Lorenzo Paolo, Kumar Ravi, Turos Mugurel, Canestrari Francesco, Lu Xiaohu, Marasteanu Mihai
Department of Civil, Environmental, and Geo- Engineering, University of Minnesota, Twin Cities, 500 Pillsbury Drive SE, Minneapolis, MN 55455, USA.
Department of Civil and Building Engineering, and Architecture (DICEA), Università Politecnica delle Marche, Via Brecce Bianche, 60131 Ancona, Italy.
Materials (Basel). 2020 Feb 7;13(3):772. doi: 10.3390/ma13030772.
With the major advance in nanotechnology, there has been an emerging interest in applying nanoscale materials to asphalt pavement materials. Among them, considerable interest has been directed to carbon-based nanomaterials, such as carbon nanotubes (CNTs) and graphite nanoplatelets (GNPs). Recent studies have proven that the addition of small percentages of GNPs could significantly reduce the compaction effort required to densify HMA. Viscosity measurements showed, however, that the addition of GNPs increased the viscosity of the binder. This observation pointed towards the presence of a different mechanism responsible for the reduction of compaction effort. A new test method used for lubricants and based on tribology has been recently proposed in order to characterize the lubricating behaviour of asphalt binders. In this study, the tribological characterization of an asphalt binder modified with GNPs was performed. A novel approach in which aggregate surface microtexture was simulated using rough surfaces of the testing fixtures, shows that indeed, the addition of GNPs lowers the friction coefficient and therefore, enhances the lubrication properties of the binder when mixed with mineral aggregates.
随着纳米技术的重大进展，将纳米级材料应用于沥青路面材料的兴趣日益浓厚。其中，碳基纳米材料，如碳纳米管（CNTs）和石墨纳米片（GNPs），受到了广泛关注。最近的研究表明，添加少量的GNPs可以显著降低压实热拌沥青混合料所需的压实功。然而，粘度测量显示，添加GNPs会增加粘结剂的粘度。这一观察结果表明，存在一种不同的机制导致压实功的降低。最近提出了一种基于摩擦学的用于润滑剂的新测试方法，以表征沥青粘结剂的润滑行为。在本研究中，对用GNPs改性的沥青粘结剂进行了摩擦学表征。一种新颖的方法，即使用测试夹具的粗糙表面模拟集料表面微观纹理，表明添加GNPs确实降低了摩擦系数，因此，当与矿物集料混合时，增强了粘结剂的润滑性能。
