Rheological Properties of Composite Modified Asphalt with Direct Coal Liquefaction Residues

Abstract In order to solve the problem of high-value utilization coal-to-oil residual direct coal liquefaction asphalt, it is compounded with SBS and aromatic oil modify matrix 9 compounding schemes are designed using orthogonal experimental methods. Dynamic frequency sweep tests DSR a simplified Carreau equation model fitted complex viscosity obtain its zero shear viscosity; creep recovery rate, irrecoverable flexibility difference each modified asphalt were determined by MSCR at different temperatures stress levels, high temperature rheological properties composite asphalts evaluated grey correlation analysis parameters. Bending beam experiments carried out on aged analyse low based viscoelastic parameters linear fitting Burgers model. The results show that: deformation resistance DCLR better than most influential modifier SBS, higher dose, stronger resistance. unrecoverable J nr3.2 70 °C can respond performance ratio 9% + 4% 2% best performance. reflect process has some defects in performance, dose DCLR, poorer asphalt. sensitivity been reduced, crack slightly enhanced.