| Pervious asphalt pavement has the benefits of improving the traffic safety and the driving comfort,reducing the traffic noise and so on,which attract road workers’ attention in recent years.As an important component of the pervious asphalt pavement,the quality of the high viscosity asphalt influences the quality of the pervious asphalt pavement directly,therefore,it gradually becomes one of the hot topics of the high performance modified asphalt.According to the technical requirements of permeable asphalt pavement high viscosity modified asphalt,analyzed the permeable asphalt pavement material composition characteristics of high viscosity modified asphalt,ductility,penetration and softening point conventional indexes such as dynamic viscosity and 60℃ as control index,the matrix asphalt,SBS and dosage of stabilizing agent,extract oil of high viscosity modified asphalt the influence law of various indicators,to determine the optimal dosage of modifier.A kind of high viscosity modified asphalt suitable for permeable asphalt pavement with excellent properties was prepared by special modification technology.The dynamic mechanical properties of high-viscosity asphalt modified by SBS were studied.The results showed that in the temperature scanning mode,complex modulus G*,elastic modulus G’,loss modulus G " and G*/sin all presented an increasing trend with the decrease of temperature and the increase of SBS content.In frequency scanning mode,modified asphalt with high SBS content has low sensitivity to frequency and the higher SBS content is,the more viscoelastic the modified asphalt is.The cole-cole diagram in frequency scanning mode shows that,with the increase of SBS content,the cole-cole diagram shows a trend of deviation from the semicircular shape,and its compatibility with asphalt gradually becomes worse.Through creep recovery test,it is found that with the increase of SBS content,the creep recovery rate of asphalt increases gradually,while the non-recoverable compliance decreases gradually.The viscoelastic index(G*,G’,G" and G*/sin)of bitumen did not change significantly at the same temperature with the increase of the amount of viscosifier.TPS high-viscosity asphalt was selected as the control group,and the temperature sensitivity of two kinds of asphalt was studied by penetration index and viscosity-temperature index.The results showed that the temperature sensitivity of self-developed high-viscosity modified asphalt was low.TFOT aging test was used to study the aging performance of two kinds of asphalt.The dynamic shear rheometer was used to test the temperature scanning of the self-made high viscosity asphalt and TPS high viscosity asphalt. |
