Effect of Re-Recycling on Rheology and Microstructure of Asphalt Binder
Abstract
:1. Introduction
- (1)
- Evaluating the evolution of rheological properties of the re-recycled asphalt;
- (2)
- Analyzing the microstructure of re-recycled asphalt binder by FTIR and AFM;
- (3)
- Correlating macro properties and microstructures of the asphalt.
2. Materials and Methods
2.1. Materials and Binder Preparation
2.2. Rheological Properties Test
2.2.1. Viscosity Test
2.2.2. DSR Test
2.2.3. BBR Test
2.3. Microstructure Test
2.3.1. AFM Test
2.3.2. FTIR Test
3. Results and Discussions
3.1. Rheological Properties Analysis
3.1.1. High-Temperature Properties Analysis
3.1.2. Fatigue Performance Analysis
3.1.3. Low-Temperature Performance Analysis
3.2. Microstructure Analysis
3.2.1. AFM Test Analysis
3.2.2. FTIR Test Analysis
3.3. Macro–Micro Correlation
4. Conclusions
- Re-recycling improves the high-temperature performance of asphalt binder; however, it significantly reduces fatigue and low-temperature performance. The aged re-recycled asphalt’s ΔTc ≤ −2.5 °C; the re-recycled asphalt has the risk of low-temperature cracking. ΔTc is an effective index to evaluate the low-temperature performance of re-recycled asphalt.
- Aging accelerates the decay of the rheological properties and significantly increases the microscopic roughness and carbonyl index of re-recycled asphalt. The macro–micro results show that re-recycling significantly reduces the anti-aging performance of asphalt.
- As recycling times increase, the adhesion between asphalt binder and aggregate gradually decreases. Therefore, the re-recycled asphalt mixture has a greater adhesion cracking risk.
- The carbonyl index increases significantly in recycled asphalt binders before and after aging. However, the sulfoxide index has a small change in aged recycled asphalt binders because of sulfur consumption.
- The macroscopic properties are strongly correlated with aging functional groups, roughness, and surface energy of recycled asphalt; aging functional groups also strongly correlate with surface energy and roughness. The microstructural changes in asphalt significantly affect the macroscopic properties.
- All results are based on asphalt experiments; however, the asphalt mixture is also an essential part of recycling, and additional asphalt mixture experiments are crucial. In addition, multiple recycled asphalt preparation method is complex; a simple preparation method is urgently needed.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Technical Index | Results |
---|---|
Penetration Value/0.1 mm | 77.76 |
Softening Point/°C | 47.85 |
Ductility at 10 °C/cm | >100 |
Number | Sample ID | Description |
---|---|---|
1 | TFOT | Thin-film oven test |
2 | PAV | Pressure aging vessel |
3 | RAB | Raw asphalt binder |
4 | AA | Aged raw asphalt binder |
5 | SRA | Single recycled asphalt binder |
6 | ASRA | Aged single recycled asphalt binder |
7 | RRA | Re-recycled asphalt binder |
8 | ARRA | Aged re-recycled asphalt binder |
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Chen, R.; Zhu, H.; Ou, L.; Xu, Y. Effect of Re-Recycling on Rheology and Microstructure of Asphalt Binder. Materials 2022, 15, 6641. https://doi.org/10.3390/ma15196641
Chen R, Zhu H, Ou L, Xu Y. Effect of Re-Recycling on Rheology and Microstructure of Asphalt Binder. Materials. 2022; 15(19):6641. https://doi.org/10.3390/ma15196641
Chicago/Turabian StyleChen, Ruipu, Hongzhou Zhu, Li Ou, and Yanling Xu. 2022. "Effect of Re-Recycling on Rheology and Microstructure of Asphalt Binder" Materials 15, no. 19: 6641. https://doi.org/10.3390/ma15196641