为了解决沥青病害带来的问题,延长沥青路面的生命周期,对改性沥青的性能进行了许多研究,尤其是聚氨酯(PU)改性沥青。本研究是用废聚氨酯(WP)代替部分苯乙烯-丁二烯-苯乙烯(SBS)改性剂,用于制备WP/SBS复合改性沥青,以及探索其性能和微观结构。在此基础上,用常规性能试验研究了WP/SBS复合改性沥青的基本性能,分析高低温流变特性,通过动态剪切流变仪(DSR)和弯曲梁流变仪(BBR)测试WP/SBS复合改性沥青的永久变形抗力和储存稳定性。利用荧光显微镜(FM)和傅里叶变换红外光谱(FTIR)观察了WP/SBS复合改性沥青的微观结构,以及WP和沥青之间的反应。根据这项研究的结果,WP可以代替SBS作为改性剂制备耐低温性能好的WP/SBS复合改性沥青,其高温性能将低于SBS改性沥青。经过综合考虑,4%SBS含量和15%WPU含量(4S/15W)被确定为WPU/SBS复合改性沥青的合适类型。
In order to solve the problems caused by asphalt diseases and prolong the life cycle of asphalt pavement, many studies on the properties of modified asphalt have been conducted, especially polyurethane (PU) modified asphalt. This study is to replace part of the styrene-butadiene-styrene (SBS) modifier with waste polyurethane (WP), for preparing WP/SBS composite modified asphalt, as well as exploring its properties and microstructure. On this basis, this paper studied the basic performance of WP/SBS composite modified asphalt with a conventional performance test, to analyze the high- and low-temperature rheological properties, permanent deformation resistance and storage stability of WP/SBS composite modified asphalt by dynamic shear rheometer (DSR) and bending beam rheometer (BBR) tests. The microstructure of WP/SBS composite modified asphalt was also observed by fluorescence microscope (FM) and Fourier transform infrared spectroscopy (FTIR), as well as the reaction between WP and asphalt. According to the results of this study, WP can replace SBS as a modifier to prepare WP/SBS composite modified asphalt with good low-temperature resistance, whose high-temperature performance will be lower than that of SBS modified asphalt. After comprehensive consideration, 4% SBS content and 15% WPU content (4 S/15 W) are determined as the suitable types of WPU/SBS composite modified asphalt.