Cracking Performance Evaluation of RAP Mixes
Publication: Journal of Transportation Engineering, Part B: Pavements
Volume 149, Issue 1
Abstract
Cracking is one of the most common pavement distresses that affect the design life and durability of hot-mix asphalt pavements. The evaluation of cracking resistance is essential in pavement design. Several laboratory tests and performance indicators are used to evaluate cracking resistance. This study examines the sensitivity of various cracking tests and performance indicators to the change in mix composition and evaluates the variability and correlation between various cracking performance indicators. The cracking performance indicators used in this study are IDEAL-, cracking resistance index (CRI), , , fracture energy (), , , and flexibility index (FI). The results showed that and captured the change in binder content, binder grade, and RAP content. Other indices, including IDEAL-, , CRI, and , were sensitive to binder content and to only one RAP source. RAP source was found to have a significant effect on cracking performance in this study. The results also showed that high RAP content (up to 50%) provided performance comparable to that of the control mix depending on the RAP source. In addition, cracking performance could be improved by increasing the binder content in mixes with stiffer RAP materials. This indicates the importance of balanced mix design when incorporating RAP materials in asphalt mixes.
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Data Availability Statement
All data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This study is sponsored by Idaho Transportation Department (ITD). The authors acknowledge the support provided by the ITD Project Research Committee members and ITD district engineers.
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© 2022 American Society of Civil Engineers.
History
Received: Feb 7, 2022
Accepted: Sep 16, 2022
Published online: Nov 23, 2022
Published in print: Mar 1, 2023
Discussion open until: Apr 23, 2023
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