It is one of the tests required by Superpave for checking PG asphalt binder specifications. The time to complete a test is approximately five minutes and calibration time is less than five minutes. In this test, a constant load is applied at the center of a small asphalt beam for a selected period of time. During this loading time, the deflection of the beam is measured continuously and monitored by a computer. Viscometer A Brookfield Viscometer will also acquired for the Advanced Asphalt Laboratory.
Rotational viscosity is used to evaluate high temperature workability of binders.
A rotational coaxial cylinder viscometer, such as the Brookfield apparatus, is used rather than a capillary viscometer. High temperature binder viscosity is measured to ensure that the asphalt is fluid enough when pumping and mixing.