High temperature rheological properties of high content rubber-SBS composite modified asphalt
In order to study the effects of composite modification by high content rubber powder-SBS on the high-temperature rheo-logical properties of matrix asphalt,the trend of the performance of high content crumb rubber-SBS composite modified asphalt with the change of crumb rubber content was studied firstly by three indexes and Brookfield rotational viscosity.Subsequently,six test schemes were designed and the high temperature rheological properties of six kinds of asphalt were explored by dynamic shear rheom-eter,based on which a detailed comparative study was carried out.The results show that the high and low temperature performance of high content crumb rubber-SBS composite modified asphalt increases with the increase of crumb rubber content.When the con-tent of crumb rubber is 42%,good performance and satisfaction of construction requirements can be achieved simultaneously.In the high temperature rheological property test,compared with the single modified asphalt,the complex shear modulus(G*),rutting fac-tor(G*/sin(δ))and creep recovery rate(R)of the matrix asphalt are significantly improved by the composite modification,and the phase angle(δ)and irrecoverable flexibility(Jnr)are reduced.Meanwhile,stronger elastic properties,high temperature rutting resis-tance,deformation recovery ability,and deformation resistance are obtained.In addition,with the increase of rubber powder content from 21%to 42%,the elastic components of rubber powder-SBS composite modified asphalt also increase,the deformation recov-ery ability and deformation resistance are stronger,and the high temperature rheological properties are improved.
high content rubber powderSBShigh content rubber powder-SBS composite modified asphaltrheological proper-tiesdynamic shear rheology test
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