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Recycled Heavy Bio Oil as Performance Enhancer for Rubberized Bituminous Binders
Jiangmiao Yu1, Zhibin Ren2, Zheming Gao3
1School of Civil Engineering and Transportation, South China University of Technology, Wushan Road, Tianhe District, Guangzhou 510000, China. yujm@scut.edu.cn.
Polymers
|May 8, 2019
Summary
Heavy bio oil (HBO) improves asphalt rubber (AR) workability and storage stability. This sustainable paving material shows enhanced resistance to rutting and fatigue, with direct mixing yielding the best results.
Area of Science:
- Materials Science
- Civil Engineering
- Sustainable Pavement Technology
Background:
- Asphalt rubber (AR) is a sustainable paving material utilizing waste tires, offering reduced traffic noise and improved mechanical properties.
- However, challenges with AR's workability and storage stability hinder its widespread adoption in road construction.
Purpose of the Study:
- To address the workability and storage stability issues of asphalt rubber (AR) simultaneously.
- To investigate the effects of incorporating heavy bio oil (HBO) into AR binders.
Main Methods:
- Preparation of bio-asphalt rubber (bio-AR) binders using three distinct mixing sequences.
- Conducting a comprehensive series of rheological and chemical tests on the prepared binders.
Main Results:
- Bio-AR binders demonstrated superior resistance to rutting and fatigue compared to conventional AR binders.
- The viscosity of bio-AR binders approached that of AR modified with commercial warm mix additives, indicating improved workability.
- Enhanced storage stability was observed in bio-AR due to a reduced density difference between the asphalt and crumb rubber phases, attributed to HBO's higher density.
Conclusions:
- Direct mixing (ARB) of HBO resulted in the best overall performance among the tested bio-AR binders.
- Early incorporation of HBO minimally impacted binder performance while offering potential energy savings during production.
- Further research is recommended on the performance of bio-AR mixtures and a quantitative assessment of energy savings in production and compaction.
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