基于重复加载蠕变试验的沥青混合料高温稳定性能研究

为了研究车辙随温度和应力改变的变化规律,对AC-13、AC-16和AC-20三种不同级配沥青混合料,在三种温度下进行重复加载蠕变试验,提取多种反映沥青混合料高温变形性能的力学参数,并进一步分析了这些参数在不同温度水平下的变化规律.研究结果表明,随着温度的增加,劲度模量、流动次数和斜率表现出一定的规律性,而永久变形没有明显的规律性；加载应力为0.7MPa、温度为60℃时,劲度模量、流动次数和斜率对于三种不同的混合料区分度最大.

High Temperature Stability of Asphalt Mixture Based on Repeated Loading Creep Test

In order to study the variation of rutting with the variation of temperature and stress, the repeat- ed creep tests of three different graded asphalt mixtures, AC-13, AC-16 and AC-20, are conducted under three different temperatures, extracting a variety of mechanical parameters to reflect high tempera- ture deformation of asphalt mixture performance and further analyzing the change law of these parameters at different temperature levels. The results show that as the temperature increases, stiffness modulus, flow number and slope show a certain regularity and permanent deformation shows no apparent regularity; when loading stress is 0.7MPa and temperature is 60℃, the stiffness modulus, mobile number and slope have max discrimination on three different mixes.