沥青混合料动态模量及主曲线试验研究

Research on Dynamic Modulus and Master Curve of Asphalt Mixture

采用旋转压实仪成型了三种沥青混合料圆柱形试件,并钻芯取得动态模量试验试件。使用UTM-30试验系统在不同试验温度和荷载频率条件下,对三种不同类型沥青混合料进行了动态模量试验。分析了沥青混合料动态模量与试验温度、荷载频率、沥青种类及混合料类型的变化关系。利用西格摩德(Sigmoidal)函数构建了沥青混合料的动态模量主曲线。研究表明:在相同试验条件下,试验温度升高和荷载频率减小使动态模量减小,温度降低和荷载频率增大使动态模量提高。采用高模量沥青对SMA-13沥青混合料动态模量的提高能力优于SBS改性沥青。20℃试验温度下,沥青混凝土的动态模量主要与高模量改性沥青胶结料有关。动态模量主曲线与动态模量实测值有较好的相关性。

Three test pieces of cylindrical asphalt mixture were formed by Superpave Gyratory Compactor,and the test pieces of dynamic modulus were obtained by the core.Dynamic modulus tests were carried out on three different types of asphalt mixtures by using the UTM-30 test system at different test temperatures and load frequencies.The relationship between the dynamic modulus of asphalt mixture and the test temperature,load frequency,asphalt type and mixture type was analyzed.The dynamic modulus master curve of the asphalt mixture was constructed by using the Sigmoidal function.The study has shown that under the same test conditions,the dynamic modulus was reduced with the increase of test temperature and the decrease of load frequency,and the dynamic modulus was increased with the decrease of temperature and the increase of load frequency.The dynamic modulus of SMA-13 asphalt mixture is better than SBS modified asphalt when using high modulus modified asphalt.The dynamic modulus of asphalt concrete is mainly related to high modulus modified asphalt binder at 20.The master curve of dynamic modulus takes a good correlation from the measured values of the dynamic modulus.