Dynamic mechanical properties of composite polyphosphate modified bitumen mixture

• 1、School of Civil Engineering, Inner Mongolia University of Technology, Hohhot 010051,China
• 2、Inner Mongolia Autonomous Region Key Laboratory of Civil Engineering Structure and Mechanics (Inner Mongolia University of Technology), Hohhot 010051, China
• 3、School of Transportation, Dalian University of Technology, Dalian, Liaoning 116024, China

Abstract：In order to investigate the dynamic mechanical properties of PPA+SBS modified asphalt mixtures, uniaxial compression dynamic modulus test were conducted. The influence of temperature and frequency on dynamic modulus and phase angle was analyzed. Additionally, dynamic modulus and phase angle master curves were constructed based on the modified Havriliak-Negami (HN) model. A comparative analysis was also performed with SBS-modified asphalt mixtures. The results indicate that both types of asphalt mixtures exhibit similar trends in dynamic modulus and phase angle variations with changes in temperature and frequency. The HN model accurately fits the master curves of dynamic modulus and phase angle for both asphalt mixtures. In comparison to SBS-modified asphalt mixtures, the phase angle of PPA+SBS composite modified asphalt mixtures decreases at -10, 20, and 50 C, while the dynamic modulus decreases at -10 C, shows relatively minor changes at 20 C, and increases at 50 C. Over a wider frequency range, PPA+SBS composite modified asphalt mixtures exhibit increased dynamic modulus and decreased phase angle at high temperatures and low frequencies, while they show decreased dynamic modulus and relatively stable phase angle at low temperatures and high frequencies. These findings suggest that PPA+SBS composite modified asphalt mixtures possess superior dynamic mechanical properties.

Keywords： road engineering polyphosphoric acid+SBS composite modified asphalt mixture dynamic modulus phase angle main curve