![]() ![]() ![]() Dynamic viscosity is proportional to this measured torque. Atmospheric capillary tube viscometer is employed to measure the kinematic viscosity.Īnother method to measure the viscosity is the use of a rotational viscometer where a torque required to rotate a spindle at constant speed while immersed in the sample fluid. To guarantee best accuracy, viscometers which were calibrated by automatic measurement should be used. The vacuum capillary tube viscometer is used to find absolute viscosity. Absolute viscosity To determine absolute kinematic viscosities, calibrated viscometers have to be used. Bitumen tend to soften, when subjected to a temperature rise and will harden when the temperature falls. The specifications kept for measurement is the absolute viscosity at 60 degree Celsius and a Kinematic viscosity at 135 degree Celsius. The dynamic viscosity can also be calculated in terms of kinematic viscosity in units m2/s or mm2/s.īased on absolute or kinematic viscosity requirement, the bitumen viscosity can be measured by a variety of devices. The RV test can be conducted at various temperatures, but since manufacturing and construction. This measurement is used in the Superpave PG asphalt binder specification. The viscosity can be defined as the ratio of shear stress applied to the rate of shear strain. The Rotational Viscometer (RV) (Figure 1 and Figure 2) is used to determine the viscosity of asphalt binders in the high temperature range of manufacturing and construction. Vibrating-probe style viscometers are typically used for trending viscosity changes, rather than obtaining absolute viscosity values. For liquids, it corresponds to the informal concept of thickness. This vibrating-probe style viscometer can be mounted to a flange on the side of a tank, for example. The resistance of a liquid in flowing is defined as the viscosity of that fluid. The viscosity of a fluid is a measure of its resistance to deformation at a given rate.
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