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The Marshall Stability is the resistance to plastic flow of a  4 in. (102 mm) cylindrical asphalt specimen loaded in a direction perpendicular to the cylindrical axis using a Marshall apparatus. Marshall stability and flow values are used in asphalt mix design and evaluation of asphalt mixtures. It is typically the peak resistance load obtained during a constant rate of deformation. The specimens can be obtained from pavement cores or laboratory molded. Laboratory molded specimens should have a thickness of 2.5 in. (63.56 mm). The measured stability of a specimen should be corrected for its thickness or volume. These correction factors (correlation ratios) are interpolated from a predefined list of correlation ratios.

 

The data entry and calculations for this test are performed on the Marshall Stability form described in the next section. After the data and calculations have been performed the results are displayed in a test report as described in the reporting section below. The format of this report is controlled by the geotechnical template used for the test.

 

The methodology and calculations for this test adhere to "ASTM D6927-15 Standard Test Method for Marshall Stability and Flow of Asphalt Mixtures". For more detailed information on the methodology and calculations please review this standard.