Characterization of Recovery in Asphalt Binders
Abstract
:1. Introduction
2. Measurement of Internal Stress in Asphalt Binders
2.1. Measurement Principle of the CSR Test
- σk < σi so σe < 0: the residue strain decreases with time, as indicated by .
- σk = σi so σe = 0: the residue strain remains constant, as indicated by .
- σk > σi so σe > 0: the residue strain increases with time, as indicated by .
2.2. Design of CSR Test for Asphalt Binders
3. Materials and Tests
4. Verification of CSR Test in Asphalt Binders
4.1. Verification of Loading Conditions
4.2. Effect of Disturbance by Step-Loads
4.3. Accuracy of Measured Internal Stress
5. Characterization of Recovery Properties for Asphalt Binders
- (1)
- The proposal of the kinetics-based model to evaluate and predict the recovery properties for asphalt binders; and
- (2)
- The analysis of the model results for both undamaged and damaged asphalt binders.
5.1. Development of the Kinetics-Based Recovery Model
5.2. Analysis of the Modeling Results
6. Conclusions and Future Work
- The CSR test to measure the internal stress in asphalt binders is feasible and accurate at 15 °C, 25 °C, and 35 °C. It is applicable to both the unaged base binder and SBS modified binder.
- For the destructive CSR test, the creep compliance cannot be calculated beyond the loading period, so it is of great significance to use the destructive CSR test to measure the internal stress of damaged asphalt binders.
- The kinetics-based recovery model is developed for both an unaged base binder and SBS modified binder at 15 °C, 25 °C, and 35 °C based on the recovery modulus. The change of recovery modulus with the recovery time can be predicted accurately based on this model.
- The recovery modulus decreases when the temperatures increase from 15 °C to 35 °C. The constant-rate recovery activation energy indicates major differences between nondestructive and destructive loading conditions in unaged asphalt binders, while the fast-rate recovery activation energy stays almost constant regardless of the loading conditions.
- The activation energy for healing is calculated by the constant-rate recovery activation energy of both undamaged and damaged unaged base binder and SBS modified binders. The results indicate that SBS modified unaged asphalt binder has better healing abilities than the unaged base binder.
Author Contributions
Funding
Conflicts of Interest
References
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Step Number | Step-Load Number | ||||||
---|---|---|---|---|---|---|---|
1 | 2 | 3 | 4 | 5 | 6 | 7 | |
(a) Loading values of the nondestructive test | |||||||
1 | 20%PN | 10%PN | 8%PN | 6%PN | 4%PN | 2%PN | \ |
2 | 40%PN | 35%PN | 25%PN | 15%PN | 12%PN | 10%PN | \ |
(b) Loading values of the destructive test | |||||||
1 | 10%PD | 8%PD | 6%PD | 5%PD | 4%PD | 2%PD | 1%PD |
2 | 30%PD | 20%PD | 15%PD | 10%PD | 8%PD | 6%PD | 4%PD |
3 | 50%PD | 40%PD | 30%PD | 25%PD | 20%PD | 15%PD | 10%PD |
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Ma, F.; Luo, X.; Huang, Z.; Wang, J. Characterization of Recovery in Asphalt Binders. Materials 2020, 13, 920. https://doi.org/10.3390/ma13040920
Ma F, Luo X, Huang Z, Wang J. Characterization of Recovery in Asphalt Binders. Materials. 2020; 13(4):920. https://doi.org/10.3390/ma13040920
Chicago/Turabian StyleMa, Fuquan, Xue Luo, Zhiyi Huang, and Jinchang Wang. 2020. "Characterization of Recovery in Asphalt Binders" Materials 13, no. 4: 920. https://doi.org/10.3390/ma13040920