Abstract
This study investigated the dynamic response of various asphalt concrete (AC) mixtures subjected to sinusoidal loading. Eight AC mixtures (four wearing and four base course) were selected including (but not limited to): superpave, asphalt institute manual series, and dense bituminous macadam. The uniaxial dynamic modulus (|E*|) test at various temperatures (4.4–54.4 °C) and frequencies (0.1–25 Hz) was conducted using asphalt mixture performance tester. Statistical analysis of two-level factorial was employed to regulate the factors affecting the AC mixtures. The results revealed that an increase in temperature (from 21.1 to 37.8 °C), translated into 45 and 43 % drop in |E*| values on average while 80 and 67 % decrease in |E*| values was attributed to the sweep of frequency (from 25 to 0.1 Hz) for wearing and base course mixes, respectively. Non-linear regression model was developed to express the dynamic modulus as a function of test temperature, loading frequency and mixture volumetric parameter. Furthermore, Witczak model of dynamic modulus prediction was evaluated and the results indicated a close fit with an average under prediction error of 0.20. The study characterized and ranked the representative AC mixtures that could help in selecting the material/gradation for mechanistic-empirical pavement design approach.
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Acknowledgments
This research was sponsored by National Highway Authority (NHA) through Highway Training and Research Center (HRTC) and was part of research project titled “Improvement of asphalt mix design technology for Pakistan” under collaboration agreement with National University of Sciences and Technology. The technical support and financial assistance provided by NHA, staff/officials HRTC, and NUST is hereby acknowledged.
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Ali, Y., Irfan, M., Ahmed, S. et al. Investigation of factors affecting dynamic modulus and phase angle of various asphalt concrete mixtures. Mater Struct 49, 857–868 (2016). https://doi.org/10.1617/s11527-015-0544-3
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DOI: https://doi.org/10.1617/s11527-015-0544-3