ASTM D8259/D8259M-21 PDF Download

ASTM D8259/D8259M-21 is a standard test method that outlines the procedure for testing the rutting and moisture susceptibility of compacted asphalt mixtures using the Rotary Wheel Tester (RWT). The test involves wrapping Superpave Gyratory Compactor specimens and submerging them in temperature-controlled water. The specimens are then confined between three metal wheels that apply a fixed load while rotating. The test measures the number of load cycles applied, the deformation of the specimen (rut depth), the loading rate, the water temperature, and Sigma (indicating specimen roundness).

The primary purpose of this test method is to determine the premature rutting susceptibility of asphalt mixtures by monitoring the rut depth as a function of the number of load cycles throughout the test. Additionally, the test method assesses the potential for moisture damage effects in the specimens by subjecting them to water immersion during preconditioning and the test duration.

The standard provides specific parameters for the test, including load cycle limits, rut depth limits, loading rate range, and applied load values. It also gives examples of test parameters used in a specific appendix. The standard notes that air void content and test temperature have significant impacts on the test results and provides recommendations for minimizing their effects. It also highlights the need for developing criteria for evaluating and interpreting test results based on local conditions and material characteristics.

It is important to note that the standard includes additional notes and footnotes that provide supplementary information and explanations. These notes and footnotes are not deemed as requirements of the test method.