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Effects of Field Aging on Material Properties and Rutting Performance of Asphalt Pavement
Haoyang Wang1,2, Yu Zhu3, Weiguang Zhang3
1RoadMaint Co., Ltd., Beijing 100095, China.
Materials (Basel, Switzerland)
|January 8, 2023
Summary
Field asphalt aging significantly stiffens pavement mixtures, impacting rutting performance over time. Key indicators like MSCR R3.2 and dynamic modulus are sensitive to aging, influencing pavement durability.
Area of Science:
- Civil Engineering
- Materials Science
- Geotechnical Engineering
Background:
- Pavement performance is influenced by asphalt aging and material property changes over time.
- Understanding field asphalt aging is crucial for predicting pavement rutting performance.
- NCHRP 9-49A project monitored pavement aging across diverse climate zones.
Purpose of the Study:
- To evaluate field asphalt aging through material property changes in pavements.
- To investigate the impact of asphalt aging on field rutting performance.
- To identify key parameters sensitive to field aging and correlated with rut depth.
Main Methods:
- Monitored four pavement projects in three climate zones at construction and 2-3 years post-traffic.
- Collected construction data, drilled field cores for asphalt binder and mixture property evaluation.
- Measured field rut depth, pavement structure, climate data, and base/subgrade moduli.
Main Results:
- Asphalt aging is a primary cause of asphalt mixture stiffening, though not always linear.
- Multiple Parameter Stress Control (MSCR) R3.2 and dynamic modulus are most sensitive to field aging.
- Field rut depth correlates with climate (humidity, high-temp hours, solar radiation), material properties (Hamburg rut depth, MSCR, dynamic modulus), and air voids.
Conclusions:
- Field asphalt aging significantly impacts pavement material properties and rutting performance.
- Climate conditions, specific material properties, and air voids are critical factors influencing pavement rutting.
- MSCR and dynamic modulus serve as key indicators for assessing asphalt aging effects.
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