Abstract：In order to compare the rheological properties of different modified asphalts in a wide frequency range, base asphalt and four kinds of modified asphalts of StyreneButadieneStyrene (SBS), highelasticity, highviscosity and highstrength asphalts were determined by
dynamic mechanical analysis(DMA).By strain sweep test, it is found that the linear viscoelastic range of several modified asphalts is lower than that of base asphalt for the same complex modulus value. By frequency sweep test within the linear viscoelastic range, complex modulus and phase angle master curves were constructed based on timetemperature superposition principle to identify the performance of different modified asphalts. The results show that highelasticity modified asphalt shows a marked improvement of temperature susceptibility and elastic recoverability with the shallowest complex modulus master curve and the lowest phase angle. Highviscosity and SBS modified asphalts have similar rheological properties, while
the hightemperature performance of the former is better than that of the latter. Highstrength modified asphalt has the biggest complex modulus in full frequency range with the best ruttingresistance.
2011, Vol. 32 
