New test standard for testing the bending fatigue properties (modulus and cycles to failure) using a cylindrical specimen.
Keywords3 point fatigue, asphalt, mixture, cylinder
Fatigue cracking is one of the critical distress modes in asphalt pavements. Accurate prediction and evaluation of fatigue performance are crucial to extending the service life of asphalt mixtures. Naturally, laboratory testing methods for fatigue characterization are time-consuming and require sophisticated procedures. Any effort to improve the speed and quality of the information gained from laboratory fatigue tests is valuable. This standard practice introduces a cyclic test run on cylindrical asphalt specimens in three-point beam mode, herein referred to as three-point bending cylinder (3PBC) test. The 3PBC setup possesses the most advantages of available tests and includes more advantages such as not requiring a saw to cut the ends of the sample, not requiring gluing operation (and the gluing jig), drilling, or notching. This level of practicality and ease of testing implementation is also important for use in performance-based mix design and construction acceptance.
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
Draft Under Development