石油树脂对3D打印沥青多尺度性能的影响研究

Study on the Effect of C9 Petroleum Resin on Multi-scale Properties for 3D Printed Asphalt

中文关键词: 道路工程  3D打印沥青  C9石油树脂  多尺度性能研究

英文关键词: road engineering  3D printed asphalt  C9 petroleum resin  multi-scale properties study

中文摘要:

      SBS/胶粉复合改性3D打印沥青作为裂缝修补材料存在相容性不足的问题。为改善其储存稳定性并保证其高温性能，本文选用不同掺量的C9石油树脂对3D打印沥青进行改性。根据对针入度、软化点、延度、锥入度、弹性恢复率、177℃旋转黏度等指标的分析，研究C9石油树脂对3D打印沥青物理性能的影响；采用离析试验评价C9石油树脂对3D打印沥青相容性的影响；通过温度扫描试验和多重应力蠕变恢复试验探究C9石油树脂对3D打印沥青流变性能的影响；借助傅里叶红外光谱仪和荧光显微镜进一步分析C9石油树脂对3D打印沥青微观结构的影响。宏、微观试验结果表明，当C9石油树脂掺量从0%增加至4%，3D打印沥青的针入度和锥入度减小幅度分别为5.7%和6.3%，软化点和177℃旋转黏度分别提升了1.25℃和0.42Pa·s，延度和弹性恢复率小幅降低；3D打印沥青的48h软化点差值从6.7℃降至1.6℃，相容性得到有效改善；3D打印沥青的高温稳定性和抗永久变形能力增强；3D打印沥青中芳香分含量增加，聚合物改性剂均匀分布，充分结合形成更稳固的空间结构，此过程主要表现为物理改性。当C9石油树脂掺量增加至6%，会过度增容3D打印沥青，破坏其中改性剂交联形成的稳定结构，对其高温性能和储存稳定性的改善效果趋于饱和，甚至出现不利影响。推荐3D打印沥青中C9石油树脂的最佳掺量为4%。

英文摘要:

      The SBS/CR composite modified 3D printed asphalt is a crack sealant with poor compatibility. In order to improve its storage stability and ensure its high temperature performance, different dosages of C9 petroleum resin were used to modify 3D printed asphalt in this study. According to the needle penetration, softening point, ductility, cone penetration, elastic recovery rate and rotational viscosity at 177℃ tests, effect of C9 petroleum resin on physical properties for 3D printed asphalt was investigated. Segregation test was conducted to analyze the influence of C9 petroleum resin on the compatibility for 3D printed asphalt. The influence of C9 petroleum resin on rheological properties for 3D printed asphalt was evaluated by temperature scan test and multiple stress creep recovery test. And the characteristics of 3D printed asphalt microstructure were indicated by Fourier transform infrared spectroscopy and fluorescence microscopic. The results of micro and macro tests show that when the content of C9 petroleum resin is increased from 0% to 4%, the needle and cone penetration of 3D printed asphalt are reduced by 5.7% and 6.3%; the softening point and rotational viscosity at 177℃ are increased by 1.25℃ and 0.42Pa·s; while the ductility and elastic recovery rate decrease slightly. The 48h softening point difference of 3D printed asphalt decrease from 6.7℃ to 1.6℃ and the compatibility is effectively improved. The high temperature stability and resistance to permanent deformation of 3D printed asphalt are enhanced; With the increase of aromatic content in 3D printed asphalt, the polymer modifiers are distributed uniformly and combined to form a more stable spatial structure and the physical modification mainly occurs in this process. In conclusion, four percentage of C9 petroleum resin is recommended as the optimum content in 3D printed asphalt.