Abstract： To quantitatively evaluate the mixing flow characteristic and know well about the strength evolutionism of asphalt mixture, an experimental device with different mixing velocities and different temperatures was developed and practiced in this study. A mixing experiment was carried out for different kinds of asphalt mixture with different bitumen types and different bitumen content and different granular composition. By analyzing the mixing flow behaviors of asphalt mixture, a mixing rheological model is presented, and the workability index is defined. The result shows that the mixing power measured by this device has an alternating error less than 5%, so the measurement can be thought reliable to characterize the mixing power of asphalt mixture. The consumption of mixing power is less when temperature is greater and mixing velocity is slower, thus it is easier to mix asphalt mixture. The mixing rheological behavior obeys the linear Bingham’s model, in which the slope represents the mixing viscosity of asphalt mixture, and the intercept describes the mixing plastic limit. The workability index may be defined as the area reciprocal of the Bingham’s line with mixing velocity, thus to integrate the visco-plastic parameters in theory. The mixing obstruction is greater and the workability is bad when the aggregates is coarser, the bitumen is more viscous and the bitumen content is richer. In view point of strength evolutionism of asphalt mixture, the aggregate properties determine the intrinsic plastic limit, and the bituminous mastic determines the viscous strength.
