Estimating the Healing Characteristic of Asphalt Binder Using the LASH Test
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 2
Abstract
Understanding of the healing behavior of asphalt binder is critical for fatigue modeling of asphalt paving materials. Binder-healing characterization based on the traditional time sweep test is time-consuming. The purpose of this study was to compare the damage-healing behavior of various neat and modified asphalt binders with the newly developed linear amplitude sweep healing (LASH) procedure, followed by verification on a simplified LASH (S-LASH) procedure to alternatively estimate binder-healing characteristics with reasonable testing efficiency. Thirteen neat and modified asphalt binders (17 sample conditions) were selected and respectively analyzed with standard LASH and S-LASH. Standard LASH showed that the healing performance of neat binders with the same penetration grade generally aligns with increasing damage. For the neat binders with different penetration grades, softer binders have better healing capacity. The negative aging effect on binder healing was demonstrated. Meanwhile, the healing master curve (HMC) was effective in comparing binder-healing characteristics under prefailure conditions. The healing rate () for the tested binders basically varied from 0.1 to 0.2. Finally, mean absolute error (MAE) analysis of HMC and between standard LASH and S-LASH indicated 50% (damage intensity at failure) with a 900-s rest period to be a critical LASH testing condition to derive reliable healing HMC and values. S-LASH is also recommended to estimate binder healing characteristic with significantly reduced testing time.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors would like to gratefully acknowledge the sponsorships of the National Natural Science Foundation of China (51608018).
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Journal of Materials in Civil Engineering
Volume 34 • Issue 2 • February 2022
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Dec 30, 2020
Accepted: Jun 3, 2021
Published online: Nov 17, 2021
Published in print: Feb 1, 2022
Discussion open until: Apr 17, 2022
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- Chao Wang, Guanyu Gong, Zhengyang Ren, Addressing the healing compensation on fatigue damage of asphalt binder using TSH and LASH tests, International Journal of Fatigue, 10.1016/j.ijfatigue.2022.107292, 167, (107292), (2023).