2.5.4 Determination of thixotropy
A two-step steady state flow procedure was used to increase the shear rate from 0 s-1 to 150 s-1. And immediately afterward decrease it from 150 s-1 to 0 s-1 at the same rate of change. The variation of shear stress and viscosity with the shear rate were recorded throughout the process. The obtained data were simulated curvilinearly using the cross model.