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Laboratory Testing & Field Performance of NHDOT Hot Mix Asphalt (HMA) Mixes

Since 2016, UNH has performed testing on over 60 New Hampshire Department of Transportation (NHDOT) hot mix asphalt (HMA) mixtures. These tests provide measurements of stiffness, fatigue cracking, low temperature cracking, and overall durability. The information gathered from these tests can be used in mechanistic-empirical pavement design and various indices can estimate the relative performance of the mixture in the field under real-world applications. This research will compare the laboratory performance predictions to year-to-year field collected pavement condition data. The objectives of this project are to evaluate correlations between mix design attributes, performance properties, and field performance to support specification updates. Predictive models will be developed for estimating mixture performance properties from mix design attributes to support balanced mix design (BMD) and PavementME implementation in NH. A model will be developed to estimate longevity of different mixture and pavement types in NH. This in future can support on-going NHDOT AMPS effort on asset management performance models. Recommendations will be provided to NHDOT regarding how it can improve processes (e.g. mix design and material specifications). This project builds upon work conducted under previous Projects 15680R, 26962O, and 26962N. These projects conducted extensive testing and developed appropriate laboratory conditioning methods for HMA mixtures to simulate NH conditions. The results of this project will help NHDOT better understand the performance of HMA mixes and inform decisions by lowering life cycle costs and increasing service life and mix performance.