Proceedings of the 5th International Conference on Advanced Design and Manufacturing Engineering

Dynamical characteristics of asphalt binder containing Polyphosphoric acid modifiers

Authors
Qunshan Ye
Corresponding author
Qunshan Ye
Keywords
Polyphosphoric acid; modified asphalt; complex modulus; phase angle; rutting parameter.
Abstract
The rheological properties of Polyphosphoric acid (PPA) modified asphalt binder were investigated by the dynamic shear test, and the composition change of modified asphalt was use to analyze the improvement mechanism of rheological characteristics. Test results indicated that the complex shear modulus of PPA modified asphalt binder was decreased at low temperatures, while the phase angle of asphalt binder was increased. At high temperatures, the complex shear modulus of asphalt binder with PPA modifier was increased while the phase angle was decreased. The high temperature grade of PPA modified asphalt binder could be increased 1~2 levels when the content of PPA was up to 1.0~1.5%, which implied that the rutting resistance of PPA modified asphalt binder was improved significantly.
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