Measurements of yield stress and plastic viscosity of...

Details Measurements of yield stress and plastic viscosity of... Measurements of yield stress and plastic viscosity of...

2007-04-27

2009-12-01

Williams, Hezron (Department: 2856)

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

Viscosity

Reexamination Certificate

active

07624625

ABSTRACT:
A rheometer can be used to measure yield stress and viscosity of a cement-based material with excellent results. It mainly includes a drum and at least one adaptive vane assembly. The adaptive vane assembly is replaceably connected to a shaft. The shaft rotates relative to the drum. The ratio of radius (r1) of the adaptive vane assembly to radius (r0) of the drum is between 0.1˜0.6. The shaft is rotated with a minimum rotational speed more than 0.001 rad/s, and then can measure its torque at constant speed. Accordingly, the rheometer can greatly reduce the disturbance of vanes of the adaptive vane assembly upon the cement-based materials and reduce the slippage among particles and the vanes. Moreover, the minimum shear stress is defined as a yield stress.

REFERENCES:
patent: 4594883 (1986-06-01), Pollard
patent: 4875362 (1989-10-01), Skallen
patent: 5321974 (1994-06-01), Hemmings et al.
patent: 6065330 (2000-05-01), Freeman et al.
patent: 7021123 (2006-04-01), Wallevik et al.

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