After the viscometer has been in the bath for 30 +/- 5 min, open the valve and allow the bitumen to flow in the viscometer.
Maintain the test bath temperature at 60 +/- 0.1 C.Place the charged viscometer in an oven or bath maintained at 135 +/- 5.5 C for a period of 10 +/- 2 minutes to allow larger air bubbles to escape. Pour the hot bitumen in the Canning-Manning vacuum viscometer through the larger diameter filling tube A so that bitumen is within +/- 2 mm of the fill line E.Transfer about 20 ml into a suitable container ( Pic-2) and maintain at a temperature of 135 +/- 5.5 C stirring occasionally to allow entrapped air to escape.softening point until is has become sufficiently fluid (like motor oil) to pour easily ( Pic-1). Heat the bitumen sample to a temperature not more than 90 C above its approx.Test Procedure Preparation of Sample: Pic-3 Viscosity test of bitumen If not satisfactory, these systems may have to be imported. Try them out carefully before buying them. However, be aware of water bath and vacuum control systems manufactured in India, many do not give the accuracy and consistency needed for the test (viscosity is very sensitive to small variations in temperature and vacuum level). Note: Only the Cannon-Manning viscometer tubes need to be imported at this time, the remaining equipment such as bath and vacuum system are available in India. Installation of the quoted instrument in client’s laboratory and operational training.Viscometer Stand – for holding 6 viscometers.Cannon-Manning Vacuum Viscometers– With manufacturers’ calibration certificate, viscometer holder and silicone cork.Timing Device – A stop watch or stop clock capable of reading up to ½ second.Thermometer for Bath – Mercury in glass, range 37.8 to 82 C, and graduations of 0.2 C.The system shall consist of vacuum pump, moisture trap, vacuum regulator, manometer with electronic controller, bleed valve, all interconnecting tubing/piping, and any other accessories as needed to complete the vacuum system. Vacuum System – Capable of maintaining a vacuum within +/- 0.05 cm of the desired level up to and including 30 cm of mercury.The accuracy of the temperature in the bath should be +/- 0.1 C throughout the bath.
Constant Temperature Bath – A suitable bath for immersion of at least 6 vacuum capillary viscometer tubes with a digital temperature controller.Although Asphalt Institute vacuum viscometer and Modified Koppers vacuum viscometer can also be used, the following refers to Cannon-Manning vacuum viscometer only.Ĭomplete Absolute Viscosity Testing Equipment conforming to IS:1206 (Part 2) Method for Testing Tar and Bitumen Materials: Determination of Absolute Viscosity with the following components: While obtaining quotations specify the following requirements. It should be noted that any other viscometer such as rotational viscometer cannot be used to measure the absolute viscosity at 60 C since the bitumen in non Newtonian in nature at this temperature. The following testing equipment is needed to measure absolute viscosity of viscosity graded paving bitumen ( IS:73-2006) at 60 C in accordance with IS:1206 (Part 2) (similar to ASTM D 2171), which uses a vacuum capillary viscometer. IS: 1206 (Part 2) – Method for Testing Tar and Bitumen Materials: Determination of Absolute Viscosity Test Equipment ABSOLUTE VISCOSITY TEST OF BITUMEN Reference
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