Abstract
The frictional properties of the coarse aggregate used in asphalt concrete are a major contributor to the friction of the surface mixes. Selecting an aggregate that is not only polish and crush resistant to withstand the mechanical degradation and grinding under traffic loading, but also has a low friction loss rate and reasonable friction life is vital. A laboratory aggregate test program was carried out to evaluate the polishing/friction and crushing performance of 25 different aggregate sources from different locations. Two widely used friction test methods, i.e., British pendulum testing (BPT) and dynamic friction testing (DFT) in conjunction with the three-wheel polishing testing (TWPD) and the aggregate crushing value test (ACV) were used to quantify the polishing and crushing resistance of aggregates, respectively. Several frictional and crushing test parameters were introduced, analyzed, and finally, a correlation analysis was performed to relate different aggregate friction, polishing, and crushing test parameters. All three tests showed low variability when replicate samples were compared. A strong correlation (R value of 0.92) was found between the friction loss rate and the ACV test parameters and a linear correlation with R2 of greater than 0.80 was observed between the final friction life of the aggregate and the BPT test parameters. The ACV and TWPD/BPT tests can be potentially considered as an alternative test for friction evaluation of the coarse aggregates in case the DFT device is not available, with some loss in the sensitivity in characterizing marginal materials.
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Acknowledgements
The authors are grateful to the Texas Department of Transportation for the financial support provided. The technical support provided by Mr. Richard Izzo, Mr. Edward Morgan, and Mr. Jeffrey Perabo from the Texas DOT is appreciated. The authors acknowledge the UTEP Center for Transportation Infrastructure Systems’ staff, Jose Garibay and Sergio Rocha, for their efforts in fabricating the TWPD devices.
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The authors confirm contribution to the paper as follows: study conception and design: MS, IA, data collection: CH, MS; analysis and interpretation of results: MS, MA, SN; draft manuscript preparation: MS, SN. All authors reviewed the results and approved the final version of the manuscript.
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Saghafi, M., Abdallah, I.N., Ahmad, M. et al. Correlating Aggregate Friction Test Results Under Accelerated Laboratory Polishing and Aggregate Crushing. Int. J. Pavement Res. Technol. 17, 423–434 (2024). https://doi.org/10.1007/s42947-022-00245-z
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DOI: https://doi.org/10.1007/s42947-022-00245-z