Abstract
The rheological properties of fresh concrete can be characterized by the function between shear rate and shear stress. However, neither shear rate nor shear stress can be measured directly, but transformed from the rotation speed and torque logged by the rheometer. Therefore, the relationship between the rheological model and the torque-rotation speed function needs to be established. In order to describe the nonlinear rheological behavior of fresh concrete, the Robertson-Stiff model was proposed in this paper, and the relationship between rotation speed-torque and rheological parameters measured by the coaxial cylindrical rheometer was derived. Eight concrete mixtures were made, and its rheological properties were tested with ConTec 5 viscometer. Then raw data was utilized to validate the model. The results showed that the Robertson-Stiff model could be used to describe the rheological behavior of fresh concrete.
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