Evaluating the Effects of RA on the Rheological Properties and Aging Susceptibility of RAM Asphalt
Abstract
:1. Introduction
2. Materials and Method
2.1. Materials
2.2. Preparation
2.2.1. Aged Asphalt Recovery
2.2.2. Aging of Asphalt
2.3. Laboratory Testing of Rheological Properties of Recycled Asphalt
2.3.1. DSR Experiments
2.3.2. BBR Experiments
2.4. Experiments with Asphalt Mixtures
2.5. The Asphalt Aging Model
3. Results and Discussion
3.1. DSR Results
3.1.1. PGHT
3.1.2. R Value
3.1.3. G − R
3.2. BBR Results
3.2.1. PGLT Value
3.2.2. ΔTc
3.3. Mixture Test Results
3.4. Aging Model Result
4. Conclusions
- (1)
- DSR results indicate that asphalt performance levels increase with aging time. RA1 and RA2 improved the recycled asphalt’s high-temperature performance, while RA3 and RA4 had a lesser effect on the reclaimed asphalt. The R value increased as the aging time of asphalt increased. The R values of the six asphalt samples were similar. The R value of RA1 was the lowest, indicating that the recycled asphalt with RA1 had the lowest cracking sensitivity. The G − R increased with the asphalt’s aging time. The modification effect of RA1 was the best, and the G − R value still did not reach the cracking warning value of asphalt after aging for 60 h. The modification effect of RA2 ranked second, and the addition of R3 and R4 had a detrimental impact on the anti-cracking performance.
- (2)
- Based on the experimental results of the BBR test, the recycled asphalt’s PGLT continued to increase as the aging time increased. All four RAs made the PGHT lower, and RA1 obtained the lowest PGLT. Test results for ΔTc showed that the ΔTc continued to be reduced as the aging time increased. RA1 and RA2 improved the asphalt cracking resistance the most. Recycled asphalt with the addition of RA1 did not reach the crack warning limit for ΔTc after aging for 40 h. RA3 and RA4 improved the cracking resistance of unaged recycled asphalt. Nevertheless, as the aging time increased, the cracking resistance of recycled asphalt with RA3 and RA4 was worse than that noted for 40% RAP.
- (3)
- The CT experimental results showed that RA1 and RA2 significantly increase the anti-cracking index Ict of asphalt mixtures. Its value increased approximately two-fold compared with that of 40% RAP recycled asphalt, and the addition of RA3 and RA4 had minimal influence on the crack-resistance index.
- (4)
- The recycled asphalt’s ability to resist short-term and long-term aging was better analyzed using an aging model. Analyzing the fitted parameters, it was found that RA1 had the best capability for short-term aging resistance, and RA3 had the worst ability to resist short-term aging. However, the ability of recycled asphalt with the addition of RA to resist long-term aging was worse than that noted for 30% RAP and 40% RAP. Among them, RA1 had the least resistance to long-term aging. The recycled asphalt with RA1 had the lowest G − R after 60 h of aging. However, according to the predicted trend, the G − R value of recycled asphalt with the addition of RA1 exceeded that of the other five asphalt samples as the aging time increased. This finding indicated that the crack resistance of recycled asphalt with the addition of RA1 would worsen after a longer aging time.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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PGLT | Unaged | 20 h PAV | 40 h PAV | 60 h PAV |
---|---|---|---|---|
RA1 | −38.4 | −33.8 | −30.2 | −26.1 |
RA2 | −33.7 | −28.3 | −26.0 | −23.7 |
RA3 | −30.5 | −25.8 | −22.9 | −19.2 |
RA4 | −33.2 | −28.4 | −24.3 | −21.5 |
30% RAP | −31.5 | −28.1 | −24.5 | −21.5 |
40% RAP | −31.6 | −26.6 | −24.0 | −22.1 |
G − R | RA1 | RA2 | RA3 | RA4 | 30% RAP | 40% RAP |
---|---|---|---|---|---|---|
RS | 0.347 | 0.060 | 0.102 | 0.130 | 0.407 | 0.493 |
K | 0.316 | 1.367 | 1.571 | 1.795 | 2.962 | 1.596 |
Ra | 0.060 | 0.067 | 0.105 | 0.055 | 0.025 | 0.067 |
Rb | 0.038 | 0.020 | 0.021 | 0.016 | 0.002 | 0.012 |
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Yang, Q.; Liu, Z.; Wang, R.; Sun, L.; Zhang, R. Evaluating the Effects of RA on the Rheological Properties and Aging Susceptibility of RAM Asphalt. Buildings 2024, 14, 18. https://doi.org/10.3390/buildings14010018
Yang Q, Liu Z, Wang R, Sun L, Zhang R. Evaluating the Effects of RA on the Rheological Properties and Aging Susceptibility of RAM Asphalt. Buildings. 2024; 14(1):18. https://doi.org/10.3390/buildings14010018
Chicago/Turabian StyleYang, Qifeng, Zhen Liu, Rui Wang, Lijun Sun, and Runhua Zhang. 2024. "Evaluating the Effects of RA on the Rheological Properties and Aging Susceptibility of RAM Asphalt" Buildings 14, no. 1: 18. https://doi.org/10.3390/buildings14010018