Sliding plate viscometer

5 Viscosity tests by shear plate viscometers 4.8.5.1 Sliding plate viscometer 

the use of the sliding plate viscometer is very limited and mainly for comparative studies with other viscometers. For further information, see Griffin et al. (1957) and Shell Bitumen (2003). 

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Conventional rheometer geometries such as concentric cylinders, cone and plate and parallel discs are unsuitable, even when the rheometer is designed to allow measurement of normal forces. Many of the disadvantages of such geometries are overcome in the sliding-plate viscometer (Gunasekaran and Ak, 2002). In this instrument (Figure 22.9), the sample (the exact shape and size of which need not be known) is held between a... 

KEYWORDS asphalt, binder, asphalt-aggregate interaction, adhesion, chromatography, centrifugation, sliding plate viscometer, differential scanning calorimetry, atomic force microscopy... 

Rheological Characteristics by Specially Designed Sliding Plate Viscometer... 

As shown in Sec. 1.5, the basic definition of viscosity is in terms of the sliding-plate experiment shown in Fig. 1.4. For newtonian fluids it was shown in Sec. 6.3 (Example 6.2) that the viscosity could be determined easily by a capillary-tube viscometer. It can be shown both theoretically and experimentally that the viscosity determined by such a viscometer for a newtonian liquid is exactly the same as the viscosity one would determine on a sliding-plate viscometer. Since capillary-tube viscometers are cheap and simple to operate, they are widely used in industry for newtonian fluids. 

Sliding plate viscometers Hallikainen - Shell Non-Newtonian... 

There is a great number of apparatuses (viscometers) for measuring viscosity of bitumen or bituminous binders. These viscometers could be classified as (a) rotational, (b) capillary, (c) cup or efflux and (d) sliding plate viscometers. The most common types of viscometers used for determining the viscosity of bitumen and bituminous binders are presented in Table 4.1. Table 4.1 also provides information on the type of viscometer used per bituminous binder. 

Sliding plate viscometer (Figure 4.4d) Dynamic (Pa-s) Bitumen/modified bitumen... 

The sliding plate viscometer, also known as sliding plate micro-viscometer (Figure 4.4a), measures absolute or dynamic viscosity. The apparatus comprises a loading system that applies a shear stress and a recording system of flow as a function of time. The bitumen sample is placed between two plates so as to create a very thin film of 5-50 pm. The apparatus can measure the viscosity only in the range of 10 to 10 Pa s thus, it is not suitable for low-viscosity measurements. 

The device may be used when the test is carried out under static-creep loading, which is the one developed by Shell laboratory at the end of the 1960s (Fenijn and Krooshof 1970), similar to the sliding plate viscometer or the improved version known as AARB elastomer tester (Tredrea 2007). 

For nonnewtonial fluids which are not time-dependent or viscoelastic, it is possible to convert capillary-tube viscometer measurements to the equivalent sliding-plate measurements, but this involves some mathematical manipulations. For time-dependent (e.g., thixotropic) fluids, this does not seem to be... 

This device is really the sliding-plate device wrapped around a cylinder. Mathematical corrections are needed, to make the readings of this viscometer correspond exactly to those of the sliding-plate visc ometer [2], but these are generally small see Prob, 15.11. This type of viscomker is suited to newtonian or nonnewtonian fluids with or without time dependence. Several other comparable viscometer types are known [2]. ... 

By the abovementioned way of measuring the viscosity, that is, sliding plate, the absolute or otherwise known as dynamic viscosity (q or q) is measured. At this point, it should be mentioned that the relative movement of the two solid surfaces could also be rotary such as in a system of cylindrical container and rotating cylinder, or of a flat surface (plate) with a rotating cone, or of a flat surface (plate) with a rotationally oscillating circular plate. All these systems are basically the different types of viscosity measuring devices that measure dynamic or absolute viscosity (dynamic viscometers). 

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