Effects of polyphosphoric acid modified asphalt on the low-temperature cracking of asphalt mixtures  

多聚磷酸改性沥青对沥青混合料低温抗裂性能的影响（英文）

作　　者：丁海波[1] 张华 王郴平[1] 

机构地区：[1]西南交通大学土木工程学院,成都610031 [2]福州市规划设计研究院,福州350003

出　　处：《Journal of Southeast University(English Edition)》2016年第2期215-218,共4页东南大学学报（英文版）

基　　金：The National Natural Science Foundation of China(No.51278060)

摘　　要：In order to determine whether polyphosphoric acid （PPA） can partially or completely substitute styrene-butadiene- styrene （SBS） modifier while it does not adversely affect the resistance to thermal cracking of the asphalt mixture, the low- temperature fracture properties of the PPA modified mixtures are evaluated and compared to the SBS modified mixtures. First, laboratory compacted test samples were tested by the indirect tensile test （IDT） and the newly developed fracture testing protocol, named as disk-shaped compact tension （DCT）. Then, the effects of the test temperature and air-void ratio on the low-temperature fracture properties of asphalt mixtures were analyzed. The results show that the fracture resistance of the PPA modified mixtures is worse than that of the SBS modified mixtures. However, for those modified mixtures that use the PPA substituting part of the SBS modifier, a relatively low-temperature fracture resistance can be obtained compared with the mixture only using the SBS modifier.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.

关 键 词：asphalt mixture low temperature polyphosphoricacid disk-shaped compact tension 

分 类 号：U414[交通运输工程—道路与铁道工程]