Evaluation of dynamic modulus of typical asphalt mixtures in Northeast US Region

This paper is based on the experimental results from the New England Transportation Consortium project titled “Establishing Default Dynamic Modulus Values for New England”. The dynamic modulus (|E*|) test results for 20 different dense-graded hot mix asphalt mixtures from five states in the Northeast US Region were compared with predicted |E*| values from Andrei-Witczak and Hirsch models as well as ENTPE transformation. The factors influencing measured |E*| values and prediction errors were also evaluated. The results showed that binder grade, air voids, and presence of reclaimed asphalt pavements (RAP) significantly affect |E*| values of asphalt mixtures. Statistical analysis of |E*| predictions revealed a similar level of underestimation produced by the three models over the high temperatures)>40°C). However, at medium and low temperatures (<25°C) the ENTPE transformation clearly outperforms two other models by yielding on average very small errors.