The dynamic modulus (E*) of Asphalt Concrete (AC) is the primary material property used in asphalt pavement design. However, the testing of dynamic modulus of AC is very expensive considering time, equipment and skills. This is why, instead of conducting the laboratory testing, the available regression equations in the literature are very often used to determine the dynamic modulus of AC. This research evaluated the mostly used regression equation (known as the viscosity based Witczak model) for 105 asphalt mixtures used in Colorado. The dynamic modulus of AC is predicted using the viscosity based Witczak model and is compared with the measured dynamic modulus. Result shows that the predicted dynamic modulus correlates well with the measured dynamic modulus. Hence, the viscosity based Witczak model can be used reasonably in case of no dynamic modulus test data is available.
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