TOR橡胶沥青流变性能试验

为了得到TOR橡胶沥青的流变性能,对薄膜烘箱老化和压力老化试验后的沥青试样进行布氏黏度试验和动态剪切流变试验.给出了改性沥青的制备方法、试验方法,分析了TOR对橡胶沥青复数模量、相位角、车辙因子、黏度、疲劳因子的影响.结果表明:加入TOR后,沥青的复数模量增大,相位角减小,TOR促进了废胶粉颗粒与沥青的相容性,增加了沥青的高温抗车辙性能.薄膜加热老化后基质沥青、橡胶沥青和TOR橡胶沥青的车辙因子数值均增大,黏温敏感性增强,TOR橡胶沥青的抗车辙性能较橡胶沥青有所改善.加入TOR的橡胶沥青,经压力老化后抗疲劳性能得到了加强,在较低温度环境下比橡胶沥青好;经有水压力老化,可以有效改善橡胶沥青的热氧水老化能力.

Experiments on rheological properties of TOR asphalt rubber

In order to investigate rheological properties of TOR rubber asphalt,asphalts were determined by Brinell viscosity and dynamic shear rheometer(DSR) after film oven and pressure aging treatments.The preparation and test method of modified asphalt were proposed,and the influences of TOR on the asphalt rubber properties of complex modulus,phase angle,rut factor,viscosity and fatigue factor were analysed.The results show that the complex modulus is increased by adding TOR,but with decreased phase angle.TOR can promote the compatibility between waster rubber powder particles and asphalt with increased rutting resistance at high temperature.The rut factors of asphalt,asphalt rubber and TOR asphalt rubber are all increased after heat aging with increased viscosity-temperature sensitivity.Compared with asphalt rubber,TOR asphalt rubber has better rutting resistance in actual process.The fatigue resistance of TOR asphalt rubber is improved and better than that of asphalt rubber at low temperature after pressure aging.The resistance abilities of TOR asphalt rubber to heat,oxygen and water are effectively improved after pressure aging with water.