|Table of Contents|

Rheological property of polyphosphoric acid modified asphalt(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2019年06期
Page:
14-26
Research Field:
道路与铁道工程
Publishing date:

Info

Title:
Rheological property of polyphosphoric acid modified asphalt
Author(s):
WEI Jian-guo1; 2;  SHI Song1; 3;  ZHOU Yu-ming1; 2;  LI Ping1; 2;  CHEN Zhi-yuan2;  GUAN Yang2
(1. National Engineering Laboratory of Highway Maintenance Technology, Changsha University of Science and Technology, Changsha 410114, Hunan, China; 2. School of Traffic and Transportation Engineering, Changsha University of Science and Technology, Changsha 410114, Hunan, China; 3. Xuchang Construction Investment Co., Ltd., Xuchang 461000, Henan, China)
Keywords:
pavement engineering;  pavement material;  polyphosphoric acid modified asphalt;  four-component;  compatibility;  rheological property;  low temperature performance
PACS:
U414
DOI:
10.19818/j.cnki.1671-1637.2019.06.002
Abstract:
To study the effect and action mechanism of polyphosphoric acid(PPA)on the asphalt performance, the effects of PPA on the chemical compositions of different matrix asphalts were studied by performing the four-component analysis test and three major indices test of asphalt. Based on the dynamic shear rheometer(DSR), the temperature scanning test and frequency scanning test of asphalt were carried out. The changing trends of rheological properties of PPA modified asphalt, PPA/SBS modified asphalt and PPA/rubber powder modified asphalt with different ratios under different temperatures and different dynamic frequency loading conditions were analyzed. Analysis result shows that as the PPA content(mass fraction, same later)increases, the asphaltene content increases gradually, and the oil content(saturation and aromatic)decreases. The asphalt changes gradually from the sol structure to the solution-gel structure, and the high temperature performance of asphalt enhances gradually. The high temperature performance of PPA modified asphalt is related to the asphaltene content of matrix asphalt. After being modified by PPA, the asphaltene content of matrix asphalt with high asphaltene content increases the most, its penetration reduces the most, and it has better high temperature performance. The rutting resistance factors of matrix asphalt, SBS modified asphalt and rubber powder modified asphalt increase by 1.0-8.2, 0.8-13.9 and 2.9-19.7 kPa, respectively, indicating that the PPA can effectively improve the high temperature performances, temperature sensitivities, and rheological properties of matrix asphalt, SBS modified asphalt and rubber powder modified asphalt, enhance the elastic characteristics of the asphalts, and improve their resistances to shear deformation. Compared with the single modified asphalt, the rheological property of PPA composite modified asphalt improves more obviously. There exists a good compatibility between the PPA and the polymer modified asphalt. As the PPA content increases, the ductility of asphalt at 10 ℃ decreases gradually. When the PPA content is 1.5%, the ductilities of matrix asphalt, SBS modified asphalt and rubber powder modified asphalt at 10 ℃ decrease by 77%, 64% and 39%, respectively, indicating that the PPA has a certain negative effect on the low temperature performance of asphalt. It is recommended that the PPA content should not exceed 1.0%. The optimal compound ratio of PPA/SBS modified asphalt is 1.0% PPA compounding 3%. The optimal compound ratio of PPA/rubber powder modified asphalt is 0.75% PPA compounding 15% rubber powder. 8 tabs, 23 figs, 42 refs.

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Last Update: 2020-01-13