Abstract
The influence of mixing shear rate on the rheological properties of cement paste was investigated. Cement pastes were mixed, sheared at a constant rate in a rheometer, and then subjected to increasing and decreasing shear rates, producing a hysteresis loop when plotted against shear stress. The extent of structural breakdown within the paste was evaluated as a function of mixer type and speed, based on hysteresis loop area. Plastic viscosity was measured using the linear portion of the hysteresis loop down curve. Well-mixed pastes exhibited a decreased propensity for further structural breakdown and a low plastic viscosity. Paste removed from a no-fines concrete had rheological properties similar to paste mixed at moderate speeds in a high shear blender
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