Influence of high content crumb rubber and different preparation methods on properties of asphalt under different aging conditions: Chemical properties, rheological properties, and fatigue performance

Asphalt pavements are prone to aging in construction and during service, which can affect the properties of asphalt. The behaviors high content crumb rubber modified asphalt (HCRMA) were investigated this paper. binders aged laboratory performances before after tested using attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR) test, temperature sweep (TS) frequency tests, multiple stress creep recovery (MSCR) zero shear viscosity (ZSV) bending beam rheometer (BBR) linear amplitude (LAS) test. FTIR test result shows that as progresses, (CR) continues undergo desulphurization degradation reactions HCRMA, with release substances such silica S-C bonded material from CR into bituminous phase. elasticity HCRMA decreases then increases degree increases. Besides, low performance is controlled by stiffness value, relaxation process better than 20% Moreover, reduce integrity fatigue resistance while increasing compatibility HCRMA.