为确定多聚磷酸(PPA)是否能部分或完全替代苯乙烯—丁二烯—苯乙烯(SBS)改性剂而不会对沥青混合料的低温性能产生不利的影响,对PPA改性沥青混合料的低温断裂特性进行了评估,且与SBS改性沥青混合料进行了比较.首先,采用间接拉伸试验及新开发的断裂测试方法,即盘状紧凑拉伸试验对室内成型试件进行了测试.然后,分析了测试温度及空隙率对沥青混合料低温断裂特性的影响.结果表明,PPA改性沥青混合料的低温抗裂性能劣于SBS改性沥青混合料,而PPA部分替代SBS改性剂制得的改性沥青混合料的低温断裂性能与仅采用SBS改性剂的混合料断裂性能相当. To determine whether poly (PPA) could partially or completely replace styrene-butadiene-styrene (SBS) modifiers without adversely affecting the low temperature performance of the asphalt mixture, PPA modified asphalt was mixed The low temperature rupture properties of the composites were evaluated and compared with that of SBS modified asphalt mixtures.Firstly, the indirect tensile test and the newly developed fracture test method, namely the disk-shaped compact tensile test, The influence of test temperature and voidage on the low temperature rupture properties of asphalt mixture was analyzed.The results showed that the low temperature cracking resistance of PPA modified asphalt mixture was inferior to that of SBS modified asphalt mixture and the part of PPA was replaced by SBS The low temperature rupture performance of the modified asphalt mixture prepared from the agent is equivalent to that of the mixture containing only the SBS modifier.