发育时间对橡胶沥青性能的影响

摘要

制备了不同发育时间的胶粉改性沥青样品,并通过动态剪切流变仪(DSR)和弯曲梁流变仪(BBR)等对其进行分析.用得到的高温指标(黏度、软化点、车辙因子等)和低温指标(延度、蠕变劲度)分析发育时间对胶粉改性沥青性能的影响.结果表明:胶粉改性沥青样品的高温性能和低温性能均较好;随发育时间的增加,胶粉和沥青的相容性变好,热储存稳定性变好,但温度敏感性变大,说明高温性能和低温性能有所下降.%A series of crumb rubber modified asphalt samples was prepared with different swelling times and analyzed by dynamic shear rheomter and bending beam rheometer.The influence of swelling time on properties of crumb rubber modified asphalt though analysis of high temperature parameters (viscosity,soft point,rutting factor) and low temperature parameters (ductility,creep stiffness).The results show that the properties of the modified asphalt were improved both at high and low temperature by adding rubber power into base asphalt,the compatibility and storage stability is better.However,the temperature sensitivity goes up as extending the swelling time,indicating slightly decrease of properties both at high and low temperature.