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<< Click to Display Table of Contents >> Absolute Viscosity |
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The viscosity of a fluid is a measure of its resistance to gradual deformation by shear or tensile stress. The basic test for absolute viscosity measures the time it takes for a fixed volume of bitumen to be drawn up through a capillary tube (viscometer) by means of a vacuum under a controlled temperature. This test is used to determine the absolute (dynamic) viscosity of asphalt (bitumen) by vacuum capillary viscometers at 60°C (140°F). It is typically measured at 60°C because this approximates the maximum pavement surface temperature during placement.
The data entry and calculations for this test are performed on the Asphalt Viscosity form described in the next section. After the data and calculations have been performed the results are displayed in a test report as described in the reporting section below. The format of this report is controlled by the geotechnical template used for the test.
The methodology and calculations for this test adhere to "ASTM D 2171-94 Standard Test Method for Viscosity by Vacuum Capillary Viscometer". For more detailed information on the methodology and calculations please review this standard.