ASTM D2171 Test Method for Viscosity of Asphalts by Vacuum Capillary Viscometer
1. Scope
1.1 This test method covers procedures for the determination of viscosity of asphalt (bitumen) by vacuum capillary viscometers at 60°C (140°F). It is applicable to materials having viscosities in the range from 0.0036 to over 20 000 Pa•s (0.036 to over 200 000 P).
NOTE 1 - This test method is suitable for use at other temperatures, but the precision is based on determinations on asphalt cements at 60°C (140°F).
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards:
E 1 Specification for ASTM Thermometers
E 11 Specification for Wire-Cloth and Sieves for Testing Purposes
E 77 Test Method for Inspection and Verification of Thermometers
3. Terminology
3.1 Definitions:
3.1.1 Newtonian liquid - a liquid in which the rate of shear is proportional to the shearing stress. The constant ratio of the shearing stress to the rate of shear is the viscosity of the liquid. If the ratio is not constant, the liquid is non-Newtonian.
3.1.2 viscosity - the ratio between the applied shear stress and rate of shear is called the coefficient of viscosity. This coefficient is thus a measure of the resistance to flow of the liquid. It is commonly called the viscosity of the liquid. The SI unit of viscosity is 1 Pa•s (1 N•s/m2) and is called a Pascal-second. The cgs unit of viscosity is 1 g/cm•s (1 dyne•s/cm2) and is called a poise (P). 1 Pa•s is equivalent to 10 P.
