Li Yongyi, Zhang Weijie, Yin Chaoen, Zhang Xiaorui
College of Transportation Engineering, NJ Tech University, Nanjing 211816, China.
School of Materials Science and Engineering, Southeast University, Nanjing 211189, China.
Materials (Basel). 2022 Jun 22;15(13):4409. doi: 10.3390/ma15134409.
In this study, the phase-structure and rheological response-behavior of multi-walled carbon nanotube (MWCNTs) modified asphalt-binder (MWCNTs-MA) were measured and quantified in the laboratory. The changes in the molecular dynamics due to MWCNTs modification were simulated and quantified based on the intermolecular interaction energy computations, electrostatic potential surface analyses and phase-structure modeling of the asphalt-binder matrix. The rheological properties such as the asphalt-binder viscosity and complex modulus, of both the base and modified asphalt-binders, were determined using the standard Brookfield viscometer (BV) and dynamic shear rheology (DSR) test devices, respectively. In comparison to the base asphalt-binder, the corresponding BV-DSR test results exhibited higher viscosity and complex modulus for the MWCNTs modified asphalt-binder, with reduced sensitivity and susceptibility to temperature variations. From the study results, it was observed that MWCNTs significantly improved the rheological properties and high-temperature performance of the asphalt-binder. Overall, the study has demonstrated that MWCNT modified asphalt-binder has great promising potential for application and usage as a road-pavement material, particularly with respect to mitigating the high temperature related distresses such as rutting.
在本研究中，在实验室对多壁碳纳米管（MWCNTs）改性沥青结合料（MWCNTs-MA）的相结构和流变响应行为进行了测量和量化。基于沥青结合料基体的分子间相互作用能计算、静电势面分析和相结构建模，对由于MWCNTs改性引起的分子动力学变化进行了模拟和量化。分别使用标准布鲁克菲尔德粘度计（BV）和动态剪切流变仪（DSR）测试装置，测定了基质沥青结合料和改性沥青结合料的流变性能，如沥青结合料粘度和复数模量。与基质沥青结合料相比，相应的BV-DSR测试结果表明，MWCNTs改性沥青结合料具有更高的粘度和复数模量，对温度变化的敏感性和敏感度降低。从研究结果可以看出，MWCNTs显著改善了沥青结合料的流变性能和高温性能。总体而言，该研究表明，MWCNT改性沥青结合料作为道路路面材料具有很大的应用潜力，特别是在减轻诸如车辙等与高温相关的病害方面。
