Method for calculating dynamic yield stress of fresh cement pastes using a coaxial cylinder system

The calculation of the rheological parameters fresh cement pastes plays a key role in understanding rheology cement-based mixes. Because paste is not simple Bingham fluid, suitable nonlinear model must be found for characterizing its flow. A test system which rotational speed or shear rate can changed multiple steps regarded as protocol because reaches steady state. Furthermore, theoretical derivations show that solution Couette inverse problem corresponding to modified and Herschel–Bulkley (H-B) complex. However, comparative analysis revealed yield stress could easily obtained through process based on Parabolic model. This study presents complete procedure this influence plug flow considered, points with low minimum (τmin) are excluded. Finally, accuracy proposed method verified comparisons results using mini-cone slump tests. These dynamic calculated expression consideration very close test. proves precisely characterize pastes.