One of the most widespread cement paste rheological characterization techniques is based on the use of a rotational viscometer with coaxial cylinders.
Comparison of results obtained using different geometric parameters of rotational viscometer with coaxial cylinders indicated that geometric parameters of the viscometer affect the results on rheological properties of the cement paste that can be directly and quantitatively compared not by the plastic viscosity but by the relative viscosity of the plastic (Lapasin et al.
Consider two conducting coaxial cylinders
of the length l and radius [r.sub.1] and [r.sub.2], respectively, as in the geometry shown in Fig.
purpuratus were introduced into a volume of water contained in the space between two coaxial cylinders
(a Couette cell, Fig.
Company literature introduces for fluids the CP180, a rapid, Peltier based temperature control module with coaxial cylinders
(cup and bob geometries).
The first study, performed by Goodrich and Porter (5), is based on the assumptions that: a) the torque-rheometer measuring head can be considered as two adjacent sets of coaxial cylinders, and b) a linear relation between torque (M) and angular velocity (S) may be established.
For a power-law liquid placed between coaxial cylinders, we may obtain the well-established relation for the shear stress (8):
* Viscosity at various temperatures by a coaxial cylinders
viscometer Brookfield DV II RVT.