Standard Test Method for Measurement of Apparent Viscosity of Asphalt-Rubber or Other Asphalt Binders by Using a Rotational Handheld Viscometer

Importancia y uso:

3.1 This test is primarily used for field production control of asphalt-rubber (A-R) and other high-viscosity binders; however, the test can also be used in a laboratory setting.

3.2 A handheld rotational viscometer is used to measure the apparent viscosity of a completed blend of A-R or high-viscosity binder. A rotor (spindle), turning at constant speed, is inserted in the liquid binder to be measured. The resistance to movement of the spindle (torque) caused by the viscosity of the surrounding liquid is measured using a special mechanism to obtain direct readings in Pa·s or cP.

Note 1: Spindle is generally made of stainless steel, although another metal such as brass could be used.

3.3 The measured apparent viscosity is used to control the production of the A-R or other high-viscosity binder, to assess the uniformity of the binder produced, or for other related purposes.

3.4 As the spindle turns in the A-R or other high-viscosity binder, it has a tendency to “drill” into the sample (that is, for A-R, the spindle spins the rubber particles out of the measurement area). Consequently, the apparent viscosity drops to reflect only the liquid phase of the high-viscosity binder. Therefore, the peak viscosity measurement value is recorded to reflect the viscosity of the blended material.

Subcomité:

D04.44

Referida por:

D6114_D6114M-19R23, D8418-21

Volúmen:

04.03

Número ICS:

93.080.20 (Road construction materials)

Palabras clave:

asphalt-rubber; handheld rotational viscometer; viscosity;