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动态模量可以描述沥青混合料对温度和荷载频率的敏感性,从而可以客观地反映沥青混合料在路面结构中的行为特性。本文对SMA 13、Superpave 20、Superpave 25和ATB 25等4种沥青混合料分别进行了不同温度和荷载频率下的动态模量试验,并利用DSR对混合料中所用的两种沥青胶结料(普通70号沥青和SBS改性沥青)进行对应温度和荷载频率下的动态剪切模量试验,利用试验结果对动态模量Hirsch预测模型进行了验证研究。研究结果表明利用Hirsch模型预测动态模量的精度较好,只是在高温和低荷载频率时预测偏差较大。
Dynamic modulus can describe the sensitivity of asphalt mixture to temperature and load frequency, which can objectively reflect the behavior of asphalt mixture in pavement structure. In this paper, four kinds of asphalt mixtures, such as SMA 13, Superpave 20, Superpave 25 and ATB 25, were tested for dynamic modulus under different temperature and loading frequency respectively. Two kinds of asphalt binder used in the mixture 70 asphalt and SBS modified asphalt) were used to carry out dynamic shear modulus tests at corresponding temperature and load frequency. The Hirsch prediction model of dynamic modulus was verified by the test results. The results show that the Hirsch model is more accurate in predicting dynamic modulus, but the prediction error is larger at high temperature and low load frequency.