基质沥青对花岗岩改性沥青混合料动态模量与相位角的影响

Effect of matrix asphalt on dynamic modulus and phase angle of granite modified asphalt mixture

为充分利用福建本地储量丰富的花岗岩,降低工程造价,为沥青路面设计提供动态参数,采用花岗岩改性沥青混合料,选择3种品牌基质沥青与花岗岩骨料分别制作AC-16C改性沥青混合料,进行动态模量和动稳定度试验,分析在不同温度和不同加载频率综合作用下改性沥青混合料的动态模量与相位角的变化规律。试验结果表明:随温度的升高和加载频率的减小,3种品牌基质沥青AC-16C改性沥青混合料的动态模量均逐渐减小;相位角的变化规律随温度变化较复杂,高硫沥青品牌的基质沥青AC-16C改性沥青混合料在高温低频时动态模量相对较大,相位角相对较小。试验结果可用于预测和分析不同温度与加载频率条件下的沥青路面行为特征,为沥青路面设计提供参考。

In order to make full use of the abundant granite in Fujian and reduce the project cost,the granite modified asphalt mixture is used to provide dynamic parameters for the design of asphalt pavement.Three kinds of brand of asphalt and granite aggregate are selected to make AC-16C modified asphalt mixture,and dynamic modulus and dynamic stability test are carried out to analyze the change law of dynamic modulus and phase angle of the modified asphalt mixture under the combined effect of temperature and frequency.The results show that with the increase of temperature and the decrease of loading frequency,the dynamic modulus of 3 brands of asphalt AC-16C modified asphalt mixture gradually decreases,and the change of phase angle with temperature is more complicated.The dynamic modulus of the asphalt AC-16C modified asphalt mixture of high-sulfur asphalt is relatively larger,and the phase angle is relatively small at high temperature and low frequency.The test results can be used to predict and analyze the behavior characteristics of asphalt pavement under different temperatures and loading frequencies,and provide reference for asphalt pavement design.