The Procedure of Bitumen Dynamic Viscosity Test Note that three types of capillary viscometers can be used to measure dynamic viscosity: The equipment will be required including: These pipes have thin and wide sections and there are two or more marks on them to show the volume and amount of flow.
Capillary viscometers consist of narrow tubes through which bitumen flows.
Dynamic Viscosityĭynamic or Absolute viscosity is measured by different types of vacuum capillary viscometers. The average recorded times show the final result. * When the reading on the cylinder reaches 75 ml, stop the time and record the time in seconds. * At this stage, when you read 25 ml in the cylinder, turn on the stopwatch Pay attention, during this time, the temperature of the set should not change more than 0.05 degrees Celsius from the specified test temperature. It should be positioned in the center of the tar. During this, the valve rod should be kept vertical. * Pour the sample into the cup until the leveling peg on the valve is just immersed. * Clean the orifice with suitable solvents. In addition, rotate the stirrer continuously. * Allow the sample to cool to the test temperature. * Heat the sample to a temperature of about 20 ☌ over the temperature stated in the test. * Heat the water bath to the specified test temperature (The specified test temperatures are 35☌, 45☌, 55☌, and 65☌). * Place the tar viscometer in the cup so that the top surface of the cup is level. The Procedure of Bitumen Industrial Viscosity Test To measure industrial viscosity, use equipment such as a tar viscometer, cup, water bath, stirrer, measuring cylinder, thermometer, and stopwatch. The main difference between them is the size of the orifice of the cup. There are different types of cup viscometers. Then, the time it takes for the standard volume of fluid to pass through the drain hole or orifice of the cup is recorded.Ī cup viscometer is often used to determine the viscosity of emulsions,pure bitumen, and cutback bitumen. In this method, first, at a certain temperature, 50 ml of bitumen is poured into the metal cup of the device. Using a cup viscometer is a simple method to determine viscosity at a certain temperature. The dynamic viscosity measured by a cup viscometer is called industrial viscosity.
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