# Kinematic Viscosity

The kinematic viscosity of a liquid is the absolute (or dynamic) viscosity divided by the density of the liquid at the temperature of measurement. The 135° C (275° F) measurement temperature was chosen to simulate the mixing and laydown temperatures typically encountered in HMA pavement construction.

The basic kinematic viscosity test measures the time it takes for a fixed volume of asphalt binder to flow through a capillary viscometer under closely controlled conditions of head and temperature (ASTM, 2001).

## Standard Test Methods

AASHTO T 201 and ASTM D 2170: Kinematic Viscosity of Asphalts (Bitumens)