1.1 This test method covers quantitative procedures for determining a failure point in load cycles at 25C [77F] that is related to the crack failure of bituminous mixture samples subjected in the laboratory to repeated direct-tension loads using the Overlay Tester. Test specimens are fabricated from laboratory compacted bituminous mixtures. . 1.2 Units - The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. An exception is made for the mass of epoxy, which is measured in grams only. Standard inch-pound units for mass of epoxy in these quantities are not commonly used in bituminous mixture laboratories. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 1.4 The text of this standard references notes and footnotes, which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard. 1.5 The within-laboratory repeatability standard deviation has been determined to be 76.29 cycles. A single laboratory participated in this study, testing one material and one overlay test machine with serial number TTI 0000528367. The mixture tested in the study was a TxDOT Type C using PG 64-22. Every test result represents an individual determination. The laboratory reported a total of five replicate test results. Except for the use of only one laboratory, Practice E691 was followed for the design and analysis of the data; the details are given in ASTM Research Report No. D04-XXXX. . The between-laboratory reproducibility of this test is being determined and will be available on or before March 2018. Therefore, this standard should not be used for acceptance or rejections of a material for purchasing purposes.
Include specimen preparation details along with details for using the device to test HMA materials. Other bituminous materials such as microsurfacing, slurry, cold-in-place recycled materials, and hot-in-place recycled materials may be added at a later date.
Keywordsasphalt; bituminous; reflective cracking;; overlay tester:
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top