Technical Approaches to the Recycling of Reclaimed Asphalt Pavement into Aggregate and Binder
Abstract
:1. Introduction
2. Overview of Separate Recycling
2.1. Separating Aggregate from Concrete
2.2. Separating Aggregate from Asphalt Concrete
3. Methods
3.1. Hydrothermal Rubbing Method
3.2. Hydropyrolysis
4. Results and Discussion
4.1. Hydrothermal Rubbing Method
4.1.1. Properties of Recovered Aggregate
4.1.2. Quality of Recovered Aggregate
4.2. Hydropyrolysis
4.2.1. Chemical Properties of Rejuvenated Binder
4.2.2. Physical Properties of Rejuvenated Binder
5. Analysis
6. Conclusions and Recommendations
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Composition | Unit | R5–13 | R0–5 |
---|---|---|---|
Compounding rate | % | 46.7 | 53.3 |
Properties | Unit | R0–13 | R5–13 | R0–5 | |
---|---|---|---|---|---|
Old asphalt penetration | 1/10 mm | 21 | 21 | 20 | |
Old asphalt content | % | 5.9 | 4.0 | 7.7 | |
Percentage passing by mass | 13.2 mm | % | 100.0 | 100.0 | 100.0 |
4.75 mm | 67.3 | 33.2 | 100.0 | ||
2.36 mm | 49.8 | 22.8 | 75.7 | ||
1.18 mm | 40.9 | 19.8 | 62.2 | ||
0.6 mm | 32.3 | 16.3 | 47.7 | ||
0.3 mm | 22.8 | 12.1 | 33.0 | ||
0.15 mm | 14.0 | 9.5 | 18.3 | ||
0.075 mm | 6.9 | 5.5 | 8.2 |
Volume | 1000 mL | Appearance of Equipment |
Allowable pressure | 19 MPa | |
Allowable temperature | 360 °C | |
Container material | SUS 316 | |
Heater method | Aluminum block heater | |
Applicable law | Small pressure vessel |
Properties | Unit | ORG | AGI |
---|---|---|---|
Penetration | 1/10 mm | 67 | 20 |
Softening point | °C | 47.3 | 64.9 |
Elongation | cm | 100+ | 6 |
Properties | Unit | Separation Temperature (°C) | ||
---|---|---|---|---|
70 | 80 | 90 | ||
Moisture content (After natural cooling) | % | 0.83 | 0.77 | 0.57 |
Old asphalt content | % | 0.78 | 0.70 | 0.56 |
Content of aggregates finer than 75 µm sieve | % | 0.2 | 0.2 | 0.2 |
Properties | Unit | Separation Temperature (°C) | ||
---|---|---|---|---|
70 | 80 | 90 | ||
Moisture content (After natural cooling) | % | 1.47 | 1.08 | 1.04 |
Old asphalt content | % | 0.68 | 0.57 | 0.44 |
Content of aggregates finer than 75-µm sieve | % | 0.1 | 0.2 | 0.2 |
Properties | Unit | SR5–13m 1 | R5–13m | SR1-5m | R1–5m | Virgin Aggregate (Standard Values) | |||||
---|---|---|---|---|---|---|---|---|---|---|---|
80 °C | 90 °C | 80 °C | 90 °C | ||||||||
SR2.5–5m | SR1–2.5m | SR2.5–5m | SR1–2.5m | R2.5–5m | R1–2.5m | ||||||
Moisture content (After natural cooling) | % | 0.23 | 0.17 | - | 2.50 | 1.97 | - | - | |||
Old asphalt content | % | 0.87 | 0.70 | 2.95 | 0.07 | 0.01 | - | - | |||
Content of aggregates finer than 75 µm sieve | % | 0.1 | 0.1 | 2.3 | 0.2 | 0.3 | - | - | |||
Specific gravity | × 10−3 kg/m3 | 2.63 | 2.66 | 2.67 | 2.67 | 2.67 | 2.66 | 2.66 | 2.67 | 2.65 | 2.45 or more |
Water absorption | % | 0.42 | 0.50 | 0.79 | 0.50 | 0.82 | 0.55 | 0.83 | 0.79 | 1.00 | ≤ 3.0 |
Abrasion loss rate | % | 11 | 11 | 11 | 10 | - | 14 | - | 14 | - | ≤ 30 |
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Akatsu, K.; Kanou, Y.; Akiba, S. Technical Approaches to the Recycling of Reclaimed Asphalt Pavement into Aggregate and Binder. Constr. Mater. 2022, 2, 85-100. https://doi.org/10.3390/constrmater2020007
Akatsu K, Kanou Y, Akiba S. Technical Approaches to the Recycling of Reclaimed Asphalt Pavement into Aggregate and Binder. Construction Materials. 2022; 2(2):85-100. https://doi.org/10.3390/constrmater2020007
Chicago/Turabian StyleAkatsu, Kengo, Yousuke Kanou, and Shouichi Akiba. 2022. "Technical Approaches to the Recycling of Reclaimed Asphalt Pavement into Aggregate and Binder" Construction Materials 2, no. 2: 85-100. https://doi.org/10.3390/constrmater2020007