ASTM D4957-18 PDF Download

ASTM D4957-18 is a standard test method that is used to determine the apparent viscosity of asphalt emulsion residues and non-Newtonian asphalts. It is designed to characterize the flow behavior of these materials and provide information on their rheological properties. The test is conducted using a vacuum capillary viscometer, which measures the viscosity of the material under specific conditions of shearing stress and stress history.

It is important to note that non-Newtonian viscosity values are not unique material properties, but rather parameters that depend on the fluid-viscometer system and measurement procedure. Therefore, when comparing the non-Newtonian behavior of different materials, it is crucial to use similar viscometers and conditions of measurement. Proper sample preparation is also emphasized to ensure repeatability and reproducibility of test results.

The standard highlights the importance of competent personnel, well-maintained equipment, and adherence to specifications (such as Specification D3666) for obtaining reliable results. While compliance with Specification D3666 is a step towards reliable results, other factors also influence the quality of the test outcomes. The standard cautions that following specifications and guidelines provides a means of evaluating and controlling some of these factors.

The test method is primarily aimed at determining the apparent viscosities of residues obtained from distilling asphalt emulsions but can also be applied to non-Newtonian asphalts at various temperatures. It is typically conducted in straight open-end tube viscometers, often at 60 °C, but can be used at other temperatures as well. The test method is applicable over a viscosity range of 5 to 50,000 Pa·s.

A cautionary note is provided regarding the handling of mercury, as the test method may use mercury-containing products. Users are advised to take precautions and refer to Material Safety Data Sheets (MSDS) for details on potential health hazards.

Lastly, the standard includes references to additional notes and footnotes, which provide explanatory information but are not considered requirements of the standard.