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Abstract
This paper addresses the development and evaluation of a mix stability index referred to as the gyratory stability (GS). GS is calculated from the compaction data by summing the cumulative energies dissipated in the compaction of a gyratory sample. A wide range of commonly used mixes in the State of Idaho were selected for evaluation. Mixes were tested for dynamic modulus (E*) and flow number (F N); rutting was measured with the asphalt pavement analyser (APA). Furthermore, E* test results were used in the AASHTO Mechanistic–Empirical Pavement Design Guide (MEPDG) as level 1 inputs, to predict rutting for these mixes; GS ranked mixes similarly to the APA and F N tests and MEPDG results. Furthermore, results indicated that the GS has the potential to be used as a screening tool for asphalt mix design, especially to decide upon the acceptance of the mix aggregate structure, and as a quality control tool.
Acknowledgements
This research is funded by the ITD and the US Department of Transportation under contracts with the National Institute of Advanced Transportation Technology (NIATT) at the University of Idaho (project numbers KLK483 and KLK479). The authors would also like to thank Mr Frank Eckwright, an undergraduate student in Civil Engineering at the University of Idaho, for his help in specimens' preparation and MEPDG runs.
