增容剂对煤直接液化残渣改性沥青低温性能的影响

为了评价不同增容剂对煤直接液化残渣改性沥青低温性能的影响，首先，通过正交实验确定出三种增容剂（硅烷偶联剂、苯甲醛、二甲苯）各自的最佳掺量及掺入方式；其次，采用双边缺口拉伸（DENT）试验评价加入三种增容剂后沥青的低温抗延性断裂性能；最后，结合SEM照片并利用Image Pro plus图像处理软件计算加入三种增容剂后沥青中煤直接液化残渣的分散面积比，以定量地表征三种增容剂对煤直接液化残渣改性沥青低温性能的改善效果。结果表明，加入适量增容剂在一定程度上有助于煤直接液化残渣在沥青中的分散，提高两者之间的相容性，保持煤直接液化残渣改性沥青体系的长期稳定状态，避免因煤直接液化残渣的沉淀聚集而在相界面产生应力集中，增强煤直接液化残渣改性沥青的低温抗延性断裂性能。三种增容剂对煤直接液化残渣改性沥青低温性能改善效果不同，硅烷偶联剂最优，次之为苯甲醛，最差为二甲苯。

Effect of compatibilizer on low-temperature performances of modified asphalts from direct coal liquefaction residue

In order to evaluate influence of different compatibilizers on low-temperature performances of direct coal liquefaction residue modified asphalts (DCLR modified asphalt), 3 compatibilizers including silane coupling agent, benzaldehyde and xylene were used. At first, the optimum dosage and mixing mode of the compatibilizers were determined by orthogonal test. Secondly, resistance to low-temperature cracking of the asphalt after adding compatibilizer was evaluated using the Double-Edge-Notched Tension (DENT) test. Finally, dispersion state of DCLR in asphalt were analyzed by scanning electron microscopy and software of Image Pro Plus diagram to quantitatively analyze low-temperature performances of the asphalts after adding compatibilizer. The test results show that addition of compatibilizer is helpful to improve dispersion of DCLR in asphalt and compatibility between them. Thus, the long-term stability of DCLR modified asphalt after adding compatibilizer can be maintained and its low-temperature performances are enhanced. Additionally, the 3 compatibilizers have different effects on low-temperature performances of the DCLR modified asphalt, silane coupling agent is the best, followed by benzaldehyde and xylene.