United States Department of Transportation
i
Developing Balanced Mix Design Gyrations (Ndesign) for North Dakota’s HMA Pavements
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2022-01-01
[PDF-2.37 MB]
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Edition:Final Report
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Abstract:The main objective of this study was to determine the effect of varying number of design gyrations on the hot mix asphalt (HMA) performance in terms of rutting, low-temperature cracking, and fatigue cracking resistances. Project mix samples were constructed and tested based on Ndesign values of 75, 65, and 55 (or 50) gyrations. The sample matrix included fine aggregate angularity (FAA) values of 45, 43, and 40. It also included asphalt binders of PG 58S-28, PG 58H-34, and PG 58H-28. The Analysis of Variance (ANOVA) was performed on the results and showed that the results within and across gyration levels were significantly different, thus can be compared. Test results showed that lower number of gyrations and higher binder content resulted in higher fatigue cracking and thermal cracking resistances. Even-though, lowering the number of gyrations decreased the rutting resistance, the overall rut resistance performance stayed within acceptable levels.
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