沥青混合料动态模量试验研究

利用Superpave简单性能试验机(SPT)测量了4种沥青混合料在不同温度和荷载作用频率下的动态模量;根据时间-温度置换原理,通过非线性最小二乘拟合,确定了4种沥青混合料的动态模量主曲线;比较了4种混合料不同试验温度、不同加载频率以及不同围压条件下沥青混合料的动态模量;采用车辙性能指标E*/sinΦ对4种沥青混合料的高温稳定性进行了分析,并用回弹模量试验进行了对比研究。结果表明,混合料类型、粉胶比、围压对混合料的高温稳定性有很大的影响。动态模量受混合料类型、围压、试验温度的影响。

Test Study on Dynamic Modulus of Asphalt Mixture

Four types dynamic moduli of asphalt mixtures at different temperatures and frequencies were tested by Superpave Simple Performance Tester(SPT).According to time-temperature superposition principle,dynamic modulus master curves under different temperatures,frequencies and confining pressures were determined through nonlinear least square regression.High temperature stability was analyzed by the value of E*/sinΦ.Contrastive study on compressive resilient modulus was conducted.The study indicated that types of mixtures,filler-bitumen ratio and confining pressure could exert great influence on high temperature stability of mixtures.Dynamic moduli could be impacted by types of mixtures,confining pressure and temperature.