Abstract
This study aimed to advance the implementation of the most promising wheel-tracking rutting assessment tests in the newly proposed Balanced Mixed Design (BMD) (or Performance-Engineered Mix Design method [PEMD]). In order to achieve this goal, the study examined the validity of two rutting assessment tests (i.e. Hamburg Wheel Tracking test [HWTT], and Asphalt Pavement Analyzer [APA] rut test) and three performance indicators (i.e., HWTT rut depth after 15,000 passes [HWTT15000], HWTT rut depth at 20,000 passes [HWTT20000], and APA rut depth after 8,000 cycles [APA8000]). A total number of 33 asphalt mixes including six Laboratory Mixed-Laboratory Compacted (LMLC), 10 Plant Mixed-Laboratory Compacted (PMLC), and 17 field projects were evaluated in this study. The results demonstrated that HWTT and APA rut test rutting performance indicators were sensitive to the variation in binder content and binder PG. Also, APA8000 results had low/moderate variability, while HWTT15000 and HWTT20000 had moderate variability. In addition, HWTT and APA rut test performance indicators were correlated with the observed field rutting of the evaluated field projects. Several pass/fail performance assessment thresholds were proposed including maximum rut depth of 5 mm, 10 mm, and 12.5 mm for APA8000, HWTT15000, HWTT20000, respectively. Also, the results showed that both HWTT and APA rut test provided similar rutting assessment for the evaluated mixes. The study recommended using HWTT over APA rut test since HWTT can be also used to evaluate the resistance to both rutting and moisture damage. Also, the study recommended using HWTT15000 over HWTT20000 as a performance indicator, since it requires less testing time.
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Acknowledgments
This study is sponsored by ITD. The authors acknowledge the support provided by the ITD Project Research Committee members and ITD district engineers. Also, the authors acknowledge the help from Mr. Fahmid Tousif and Dr. Ahmed Muftah in specimen preparation and testing.
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Peer review under responsibility of Chinese Society of Pavement Engineering.
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Alkuime, H., Kassem, E. Comprehensive evaluation of wheel-tracking rutting performance assessment tests. Int. J. Pavement Res. Technol. 13, 334–347 (2020). https://doi.org/10.1007/s42947-020-0265-z
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DOI: https://doi.org/10.1007/s42947-020-0265-z