1. Scope
1.1 This test method covers quantitative procedures for determining a failure point in cycles that is related to fatigue failure of 6.0 in (150 mm) long by 3.0 in (76 mm) wide by variable height bituminous mixture samples ranging in height from 0.5 in to 1.5 in (12 mm to 38 mm) from laboratory compacted asphalt concrete or extracted from the field, which are subjected to repeated direct tension loads in the laboratory using the overlay tester. 1.2 Units--The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 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 that 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 65 cycles, based on one laboratory, 150 test replicates, and 50 different samples. The 50 samples tested consisted of fine-graded, dense-graded, coarse-graded, gap-graded, and open-graded bituminous mixtures. The between-laboratory reproducibility of this test is being determined and will be available on or before March 2016. Therefore, this test method should not be used for acceptance or rejections of a material for purchasing purposes.
Include more 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.
Keywords
asphalt; bituminous; reflective cracking; fatigue cracking; overlay tester:
The title and scope are in draft form and are under development within this ASTM Committee.
Citing ASTM Standards
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