Comparison of rheological parameters of asphalt binders obtained from bending beam rheometer and dynamic shear rheometer at low temperatures

In this paper, an investigation was performed to determine if the complex modulus obtained from frequency sweeps performed with the dynamic shear rheometer (DSR) can be used to accurately predict the creep compliance obtained experimentally using the bending beam rheometer (BBR). Two sets of asphalt binders were tested at low, intermediate, and high temperatures and the results were analysed using 2S2P1D and DBN rheological models. DSR and BBR testing was performed in two different laboratories using different equipment manufacturers. It was found that significant differences are observed between the creep stiffness obtained with DSR and BBR devices, most likely due to the different preparation and conditioning of the test specimens in different cooling media.

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