Abstract
The effects of dosage(by mass) of polyphosphoric acid(PPA) on physical and rheological properties of asphalts(TZ-70, SK-90) were investigated, the changes of chemical composition and colloid structure of the asphalts were studied by chemical composition and atomic force microscopy(AFM) analyses. The results show that the softening point, viscosity, complex modulus and rut factor of the asphalts are increased with the increment of dosage of PPA, while the ductility, penetration and phase angle of the asphalts are decreased with the increment of dosage of PPA. Compared with TZ-70, the physical and rheological properties of SK-90 are improved more obviously. The thermo-stability of the asphalts is improved with the introduction of PPA. The thermo-stability of TZ-70 is more obviously improved than that of SK-90. After PPA added, the transformation of asphalt from resins to asphaltenes is promoted, which contributes to the association of the dispersed phase and increases the stiffness of asphalt. As a result, the physical and rheological properties of the asphalts are improved remarkably.
| Original language | English |
|---|---|
| Pages (from-to) | 255-260 |
| Number of pages | 6 |
| Journal | Jianzhu Cailiao Xuebao/Journal of Building Materials |
| Volume | 16 |
| Issue number | 2 |
| DOIs | |
| State | Published - Apr 2013 |
Scopus Subject Areas
- Civil and Structural Engineering
- Building and Construction
- Mechanics of Materials
Keywords
- Asphalt
- Atomic force microscopy(AFM)
- Modification mechanism
- Polyphosphoric acid(PPA)
- Rheological property
- Road engineering