Study on Performance of High Modulus Asphalt Composite Modified with Rock Asphalt and Crumb Rubber
In order to improve the rutting resistance of asphalt pavement and solve the pavement rutting problems caused by the rapid growth of traffic and heavy load,the asphalt is composite modified by using rock asphalt and crumb rubber(CR).Subsequently,the characteristics of deformation resistance and cracking resistance of different modified asphalt are analyzed with the test indicators of asphalt penetration,softening point,ductility,viscosity test and DSR.Besides,the change rule of high temperature storage stability and anti-aging performance of composite modified asphalt is studied by anti-aging performance and storage stability tests.Furthermore,FM and FTIR are used to explore modifying mechanism of composite modified asphalt.The result shows that(1)the mixture of crumb rubber and rock asphalt can improve the performance of asphalt effectively,and crumb rubber can weaken the deterioration effect of rock asphalt on low temperature performance of asphalt;(2)rock asphalt can improve the storage stability and anti-aging performance of asphalt effectively;(3)in addition,crumb rubber and rock asphalt particles make the elastic component of the composite modified asphalt obviously increase,the elastic recovery capacity is enhanced,and the high temperature shear resistance of the composite modified asphalt is improved more significantly,but the excess rock asphalt is difficult to be distributed uniformly,and it is easy to lead to particle accumulation;(4)rubber powder can swell in asphalt to form local network structure,rock asphalt particles can distribute in these network structures,and physical blending with asphalt,thus improving the cohesion of asphalt;(5)the contents of rock asphalt and rubber powder are 6%and 20%respectively.
road engineeringcomposite modified high modulus asphaltrheological testmodified asphaltrock asphalt
NETL
NSTL
万方数据
