Yu Haosheng, Jin Yong, Liang Xingmin, Dong Fuqiang
Nanjing Foreign Language School Xianlin Campus, Nanjing 210023, China.
College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China.
Polymers (Basel). 2022 Sep 14;14(18):3848. doi: 10.3390/polym14183848.
To reduce the cost of high-viscosity modifier (HVM) and alleviate white pollution problems, we prepared the environment-friendly HVM (E-HVM) by using waste-low density polyethylene/styrene-butadiene-styrene (waste-LDPE/SBS) composite. The physical characteristics of the E-HVM modifier were first investigated. Additionally, the effects of E-HVM modifier dosage (8 wt% to 20 wt%) on the rheological properties and microstructure of asphalt were, respectively, researched by dynamic shear rheometer (DSR), bending beam rheometer (BBR), and fluorescence microscopy (FM). The results show that the E-HVM modifier has lower molecular weight, and its distribution is wider than that of the Tafpack-Super (TPS) modifier; thus, the E-HVM modifier had better compatibility with asphalt, which has also been proven by FM images. Due to these reasons, the E-HVM modifier improves the high-temperature performances of asphalt more effectively than the TPS modifier, which is shown by the higher dynamic viscosity (60 °C) and G and the lower δ and Jnr(τ) Furthermore, compared to TPS modified asphalt, E-HVM modified asphalt also has a higher fatigue life at different strain levels (2.5% and 5.0%), but worse low-temperature performance. Following a comprehensive consideration of performances, the reasonable dosage range of E-HVM modifier is 12 wt% to 16 wt%.
为降低高黏度改性剂（HVM）成本并缓解白色污染问题，我们利用废弃低密度聚乙烯/苯乙烯-丁二烯-苯乙烯（waste-LDPE/SBS）复合材料制备了环保型高黏度改性剂（E-HVM）。首先研究了E-HVM改性剂的物理特性。此外，分别采用动态剪切流变仪（DSR）、弯曲梁流变仪（BBR）和荧光显微镜（FM）研究了E-HVM改性剂用量（8 wt%至20 wt%）对沥青流变性能和微观结构的影响。结果表明，E-HVM改性剂分子量较低，其分布比Tafpack-Super（TPS）改性剂更宽；因此，E-HVM改性剂与沥青具有更好的相容性，这也通过FM图像得到了证实。由于这些原因，E-HVM改性剂比TPS改性剂更有效地改善了沥青的高温性能，这表现为更高的动态黏度（60℃）、G值以及更低的δ和Jnr(τ)。此外，与TPS改性沥青相比，E-HVM改性沥青在不同应变水平（2.5%和5.0%）下也具有更高的疲劳寿命，但低温性能较差。综合考虑性能后，E-HVM改性剂的合理用量范围为12 wt%至16 wt%。
