Abstract: In order to determine the definition standard of high modulus asphalt, three kinds of high modulus modifiers were selected to modify the base asphalt. The softening point, penetration, ductility, viscosity, complex shear modulus, rutting factor and PG grading index of the prepared high modulus modified asphalt were tested by conventional performance test and rheological performance test. And the dynamic modulus and dynamic stability parameters of asphalt concrete prepared from the three kinds of high modulus asphalt were tested by uniaxial compression test and rutting test. On this basis, the regularity, discrimination and consistency of various indexes were analyzed. Through the correlation analysis between the performance indexes of high modulus modified asphalt and the dynamic modulus of high modulus asphalt concrete, the definition standard of high modulus asphalt was established with complex shear modulus as the key index and penetration index system as the auxiliary index. It is suggested that the complex shear modulus of high modulus asphalt G* (60 C, 10 Hz, 0.1%) should be greater than 66.43 kPa, G* (60 ℃, 10 Hz, 12%) should be greater than 12.8 kpa and the softening point should be greater than 61.6 ℃.

Key words: highway engineering; high modulus asphalt; dynamic modulus; complex shear modulus; definition standard; grey relation analysis

摘要： 为确定高模量沥青界定标准，选用3种高模量改性剂对基质沥青改性，通过常规性能试验和流变性能试验，分别对所制备高模量改性沥青的软化点、针入度、延度、黏度、复数剪切模量、车辙因子以及PG分级指标进行测试；采用单轴压缩试验和车辙试验，对相应沥青混凝土的动态模量及动稳定度进行测试。在此基础上，对各项指标规律性、区分度、一致性进行分析，并通过对高模量改性沥青的各项性能指标与高模量沥青混凝土动态模量的关联性分析，建立以复数剪切模量为关键性指标、针入度指标体系为辅助性指标的高模量沥青界定标准。建议高模量沥青的复数剪切模量G* (60 ℃，10 Hz，0.1%)≥66.43 kPa、G*(60 ℃，10 Hz，12%)≥12.8 kPa、软化点≥61.6 ℃。

关键词: 道路工程；高模量沥青；动态模量；复数剪切模量；界定标准；灰色关联分析