基于DSR/BBR对橡胶高黏沥青流变及疲劳性能研究

Study of rheological and fatigue properties of rubber high viscosity asphalt based on DSR/BBR

利用废旧轮胎胶粉、G型高黏剂、基质沥青制备一种高黏度改性沥青,采用动态剪切流变仪DSR测试沥青高温流变性能及疲劳性能,利用低温弯曲梁流变仪BBR测试沥青低温蠕变劲度和蠕变速率。结果表明,G型高黏剂可以有效调节橡胶沥青各组分的比例,提高其弹性比例成分,并在橡胶沥青中形成网络结构,改善其胶体稳定性,大幅度提升橡胶沥青的高温抗变形能力、低温延展性、弹性恢复能力、应力敏感性、疲劳等性能,G型高黏剂在橡胶沥青中合适掺量为8%。较橡胶沥青而言,橡胶高黏沥青的黏度、高温稳定性、低温柔韧性、抗疲劳性能等大幅增加,可有效保障排水沥青路面的路用性能及使用寿命。

Use waste tire glue powder,G-type high adhesive,and matrix asphalt to prepare a high-viscosity modified asphalt.The dynamic shear rheometer DSR was used to test the high temperature rheological properties and fatigue performance of asphalt,and the low temperature bending beam rheometer BBR was used to test the low temperature creep strength and creep rate of asphalt.The results show that:G-type high viscosity agent can effectively adjust the proportion of each component of rubber asphalt,improve its elastic proportion of components,and form a network structure in the rubber asphalt,to improve its colloidal stability,and greatly enhance the high temperature deformation resistance,low temperature ductility,elastic recovery,stress sensitivity,fatigue and other properties of the rubber asphalt,and G-type high viscosity agent appropriate dosage in rubber asphalt is 8%.Compared with rubber asphalt,the viscosity,high temperature stability,low temperature flexibility,and anti-fatigue properties of rubber high viscosity asphalt have increased significantly,which can effectively protect the road performance and service life of drainage asphalt pavements.