| Summary: | Qingchuan rock asphalt and rubber powder were used to modify the basis asphalt, and rubber powder modified asphalt and rock asphalt/rubber powder co-modified asphalt were prepared by changing the amount of rock asphalt with the constant mass fraction of 20% of rubber powder. The macroscopic properties, storage stability, rheological properties and deformation resilience were analyzed by penetration test, dynamic shear rheological test and multi stress repeated creep test, and Burgers constitutive equation was used to simulate and analyze the change law of the proportion of each component of modified asphalt under sustained stress loading. The results showed that the addition of rubber powder and rock asphalt could greatly improve the high-temperature performance of the basis asphalt and make the basis asphalt become viscous. The addition of rock asphalt had a strong weakening effect on the low-temperature performance of basis asphalt, but could improve its storage stability, while the addition of rubber powder could reduce the weakening effect of rock asphalt on the low-temperature performance of basis asphalt. The addition of rock asphalt improved the rutting resistance of the modified asphalt and increased greatly the content of elastic components of the basis asphalt, but did not make a significant difference to the content of viscous components. The ability of the basis asphalt to resist large loading was enhanced, while the stress sensitivity was reduced. The viscosity of rock asphalt/rubber powder co-modified asphalt increased slowly and rock asphalt/rubber powder co-modified asphalt hardened quickly, so that the deformation could quickly recover when subjected to large loading for a longer time.
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