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Alternative Title:National Highway System Innovative Pavement Design Study
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Abstract:This research investigated the history and performance of hot mix asphalts (HMA) used by Alaska DOT&PF. The history and changes of HMA used between the 1970’s and 2022 was documented, and currently used mixes were evaluated using pavement management data to determine the rut and transverse (thermal) cracking rates by mix and binder types. Prall testing, used to simulate studded tire wear, and Hamburg testing to determine rut deformation and stripping potential were used on a combination of lab and field mixes. Falling Weight Deflectometer (FWD) testing was performed on recently constructed projects to document fall season modulus values for HMA, base and subbase layers. It was found that the newly implemented PG64-40E binder is providing superior rutting resistance than the previously used PG58-34E binder at low and moderate speeds, the use of a hard aggregate specification is reducing the rate of studded tire rutting, and lower voids in HMA (increasing density) is improving its fatigue cracking and rut resistance. Improving HMA compaction plays a very important role in the longevity of our pavements.
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