沥青混合料高温性能试验指标的对比分析

Comparison and analysis of test indexes of high temperature performance for asphalt mixture

为了探究评价沥青混合料高温性能的最佳试验方法以及研究各试验指标之间的相关性,分别采用高温车辙试验、单轴贯入试验、马歇尔稳定度试验、动态模量试验来评价沥青混合料的高温稳定性。同时与沥青PG高温分级试验进行相关性分析。试验结果表明,沥青自身的复剪切模量与大多数指标的相关性都好; SBS-AC混合料具有最好的高温性能;利用车辙试验和高温低频条件下的动态模量能很好的评价沥青混合料的高温性能,且二者的相关性很好;单轴贯入试验得到的指标不能对同级配不同沥青混合料做出较好的区分;因此,在一定程度上,动稳定度和高温低频条件下的动态模量及车辙因子能更好的评价沥青混合料高温稳定性,建议在设计和质量控制中使用该指标。

The high temperature rutting test,uniaxial penetration test,Marshall stability test,dynamic modulus test were used to evaluatethe high temperature stability of asphalt mixture and explore the best method to evaluate the high temperature performance of asphaltmixture and study the correlation between the test indexes and analysis the correlation with the high temperature grade of asphaltPG. The results show that the asphalt itself complex correlation between shear modulus and most of the indicators are good;SBS - ACmixture has better high temperature performance. using rutting test and high temperature low frequency under the condition of dynamicmodulus can be a very good evaluation of asphalt mixture high temperature performance,and the correlation is very good. indicatorsobtained from the uniaxial penetration test can’t be on the same level with different asphalt mixture material to make the distinction betweengood. Therefore,in a certain extent,stability and high temperature low frequency under the condition of dynamic modulus andrutting factor can better evaluate the asphalt mixture material high - temperature stability,it is recommended to use the index in thedesign and quality control.