scope:

This test method outlines the procedure for measuring the apparent viscosity of hot-poured asphalt crack sealant at elevated temperature from 150° to 200°C using a rotational viscometer as specified by M 338 and PP 85.

The rotational viscometer is a rotating spindle-type viscometer that meets the requirements of T 316. This test method can be used for general specification and is especially convenient for use in a field laboratory or a plant site.

Viscosity data obtained with this test method are used to ensure that the hot-poured asphalt crack sealant's apparent viscosity is low enough to fill cracks and, at the same time, high enough not to flow out of the crack. Ideally, the shear rates during the test should match the shear rates the hotpoured asphalt crack sealant experiences during installation. The rotational speed of the spindle was selected at 60 rpm to resemble field pouring conditions. Changing spindle sizes and rotational speeds affect both the shear rate and the measured apparent viscosity.

This standard may involve hazardous material, operations, and equipment. This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the application of regulatory limitations prior to use.

The quality of the results produced by this standard are dependent on the competence of the personnel performing the procedure and the capability, calibration, and maintenance of the equipment used. Agencies that meet the criteria of R 18 are generally considered capable of competent and objective testing/sampling/inspection/etc. Users of this standard are cautioned that compliance with R 18 alone does not completely assure reliable results. Reliable results depend on many factors; following the suggestions of R 18 or some similar acceptable guideline provides a means of evaluating and controlling some of those factors.