ABSTRACT

This research study utilized a Thermal Cycler to simulate the field aging conditions and compared with standard laboratory aging methods. The Thermal Cycler intends to simulate asphalt binder aging under specific environmental conditions. The main purpose of the study is to assess the aging potential in the binder during the thermo-oxidation process. Sulphur, Methane Phosphorus Compound, Elvaloy, Multiwalled Carbon nanotubes, Carbon black nanoparticles, and Graphene nanoplatelets were used and their influence was studied on virgin binder considering their aging sensitivities. Scanning Electron Microscope, Dynamic shear rheometer, and Fourier Transform Infrared spectroscopy were used to study dispersion, rheology, and chemical changes in the binder, respectively. The results showed that aging increases the oxidation process causing more oxygen content formation. The amount of aging in PAV was equivalent to 28 days aged in Thermal Cycler. At higher temperatures, a substantial improvement in Thermal Cyclic aging was observed and around 6–8 h of aging at 110°C produced the same effect as that in PAV. Graphene nanoplatelets modified bitumen with the least Carbonyl and Sulfoxide index is relatively effective to retard aging rate. Sulphur and Methane Phosphorous Compound are relatively more sensitive to thermo-oxidative aging than the rest of the modified blends.

摘要

本研究使用热循环仪模拟现场老化条件，并与标准实验室老化方法进行比较。热循环仪旨在模拟特定环境条件下的沥青粘合剂老化。该研究的主要目的是评估粘合剂在热氧化过程中的老化潜力。使用了硫、甲烷磷化合物、Elvaloy、多壁碳纳米管、炭黑纳米颗粒和石墨烯纳米片，并考虑了它们的老化敏感性，研究了它们对原始粘合剂的影响。扫描电子显微镜、动态剪切流变仪和傅里叶变换红外光谱分别用于研究粘合剂的分散、流变和化学变化。结果表明，老化增加了氧化过程，导致更多的氧含量形成。PAV 中的老化量相当于在热循环仪中老化 28 天。在更高的温度下，观察到热循环老化的显着改善，并且在 110°C 老化约 6-8 小时产生与 PAV 相同的效果。具有最低羰基和亚砜指数的石墨烯纳米片改性沥青相对有效地延缓老化速率。硫和甲烷磷化合物比其他改性混合物对热氧化老化相对更敏感。具有最低羰基和亚砜指数的石墨烯纳米片改性沥青相对有效地延缓老化速率。硫和甲烷磷化合物比其他改性混合物对热氧化老化相对更敏感。具有最低羰基和亚砜指数的石墨烯纳米片改性沥青相对有效地延缓老化速率。硫和甲烷磷化合物比其他改性混合物对热氧化老化相对更敏感。