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Performance Evaluation of Asphalt Rubber Mixture with Additives.
Xianpeng Cheng1, Yamin Liu2, Wanyan Ren3
1Highway and Airport Pavement Research Center, School of highway, Chang'an University, Xi'an 710064, China. cheng_xp@chd.edu.cn.
Materials (Basel, Switzerland)
|April 25, 2019
Summary
Granular Polymer Durable additive (GPDa) improves asphalt rubber Stone Matrix Asphalt (AR-SMA) performance, enhancing high-temperature and fatigue resistance. GPDa is a good choice for AR-SMA, though optimal asphalt content may increase.
Area of Science:
- Materials Science
- Civil Engineering
- Recycling Technology
Background:
- Crumb rubber in asphalt offers environmental benefits and pavement advantages like crack resistance and durability.
- However, crumb rubber modified asphalt shows poor high-temperature performance.
- Additives are explored to enhance the properties of asphalt rubber Stone Matrix Asphalt (AR-SMA).
Purpose of the Study:
- To investigate the effect of additives on the laboratory performance of AR-SMA.
- To evaluate the high-temperature and fatigue properties of AR-SMA with different additives and asphalt rubber content (ARC).
Main Methods:
- Three AR-SMA groups were tested: no additives (control), Styrene-Butadiene-Styrene (SBS), and Granular Polymer Durable additive (GPDa).
- Each group was analyzed at three ARCs: 6.4%, 6.9%, and 7.4%.
- High-temperature performance and fatigue properties were assessed through laboratory testing.
Main Results:
- High-temperature performance decreased with increasing ARC for mixtures without additives.
- For SBS and GPDa, high-temperature performance initially increased then decreased with rising ARC.
- AR-SMA with GPDa at 6.9% ARC exhibited the best rutting resistance.
- AR-SMA with GPDa showed improved fatigue life and reduced sensitivity to fatigue cracking compared to the control group at appropriate ARC.
- The positive impact of GPDa on fatigue performance diminished with increasing ARC.
Conclusions:
- Granular Polymer Durable additive (GPDa) is effective in improving the high-temperature and fatigue performance of AR-SMA.
- GPDa is a suitable additive for enhancing AR-SMA, but requires a higher optimal asphalt content than traditional mixtures.
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