and after allowing the sample to attain bath temperature and any air bubble to rise to the surface. Add more liquid, if necessary to bring the upper meniscus slightly above mark G. ġ.Mount the BS U-tube viscometer in the constant temperature bath keeping tube L vertical.Ģ.Pour sample through tube N to a point just above filling mark G, allow the sample to flow freely through capillary R, taking care that the liquid column remains unbroken until the lower mark H and then arrest its flow by closing the timing tube with a cork or rubber stoppering tube Lģ. Precaution should be taken to avoid over-heating and having any entrapped air. Heat the sample to a temperature not more than 90% for bitumen until it attains totally pouring consistency & stir it and transfer approximately 20 ml into a container. Timing Device – Any timing device such as stop-watch or stop clock capable of being read up to 0.5 s. For petroleum products the kinematic viscosity is generally expressed in centistokes (cSt) which is 1/100 th of a stoke.īath :Suitable bath for immersion of the viscometer so that the liquid reservoir or top of the capillary whichever is uppermost is at least 20 mm below the upper hath level. The cgs unit of kinematic viscosity is the stoke which has the dimensions square centimetre per second. It may be defined as the quotient of the absolute or dynamic viscosity divided by the density of the liquid under test both at the same temperature. Kinematic Viscosity of a Newtonian Liquid. IS 1206 (part III) covers the method for the determination of kinematic viscosity of paving grade and cut-back It is applicable to the materials having a viscosity range of 30-100000 cSt. ![]() The CGS unit of kinematic viscosity is the stokes (St). The 135° C (275° F) measurement temperature was chosen to simulate the mixing and lay down temperatures typically encountered in HMA pavement construction.The SI unit of kinematic viscosity is m2/s. ![]() ![]() The kinematic viscosity of a liquid is the absolute or dynamic viscosity (poise 60 ° C ) divided by the density of the liquid at the temperature of measurement.
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