The transformation mechanism of the rheological model of cement slurry was explained in order to analyze the rheological properties of cement slurry under excitation. The vibration-shear equivalent theory was proposed for the rheological analysis of cement slurry under excitation. The shear rate of the flow field of cement paste in the rotary viscometer under the excitation condition was calculated according to the modified HI theory and the radial stratification algorithm of rotary viscometer. The sinusoidal vibration process of the shaking table was transformed into the shear process of cement paste. The HI parameter calibration test under the vibration frequency of 20 Hz and the viscosity test of cement paste under the vibration frequency of 30 Hz were conducted by using the self-made rotary viscometer. Results showed that the error between HI parameter calibration results and numerical calculation results was about 7%, and the error between test viscosity and numerical calculation viscosity of cement paste was 8%, which tended to converge. The viscosity of cement paste gradually decreased and reached a peak by increasing the vibration frequency. The rheological model gradually changed from Bingham model to Hershel-Bulkley model, which was transformed into Power-Law model.
Xiao-tian LI,Guang-nian XIE,Zhu-rui GAO,Sheng-jun ZHANG,Jun-shi LI. Vibration-shear equivalent theory based on rheological property of cement slurry. Journal of ZheJiang University (Engineering Science), 2022, 56(7): 1336-1341.
Tab.2Fitting expression of torque and speed of rotary viscometer at different shear rates caused by shaking table vibration
Fig.7Schematic diagram of torque variation with rotation speed of rotary viscosimeter at different shear rates caused by shaking table vibration
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