United States Department of Transportation
i
An Investigation of the Endurance Limit of Hot-Mix Asphalt Concrete: Using a New Uniaxial Fatigue Test Protocol
-
2006-01-01
[PDF-18.37 MB]
Details:
-
Creators:
-
Corporate Contributors:
-
Subject/TRT Terms:
-
Publication/ Report Number:
-
Resource Type:
-
Geographical Coverage:
-
Corporate Publisher:
-
Abstract:A research study was undertaken to investigate the existence of an endurance limit for hot-mix asphalt concrete using a new uniaxial fatigue testing protocol. The study included testing of four different mixtures. Cylindrical specimens, 120 mm in height and 80 mm in diameter, were tested by applying a tension-compression loading at 10 °C and 10 Hz. Each test included millions of cycles of sinusoidal loading with strain amplitudes of 20 and 30 µ-strain. The test results indicated that three of the mixtures tested exhibit an endurance limit below which no fatigue damage is expected regardless of the number of loading cycles applied. However, an endurance limit was not observed for one of the mixtures. This observation does not necessarily imply that for these mixtures such a limit does not exist, because some of the damage observed was the result of testing anomalies. Several problems with the data acquisition system as well as with the temperature control in the testing chamber caused interruptions in the testing. Although during the times that the test was being conducted excellent temperature and load control was exercised, some incremental improvements in the testing apparatus will be needed to remove the anomalies that were observed. A follow-on study is recommended during which the cause of the anomalies, their effect on the measured endurance limit, and means for their minimization would be studied. The improved procedure should then be extended to additional mixtures tested at different temperatures and strain levels.
-
Format:
-
Alternate URL:
-
Funding:
-
Collection(s):
-
Main Document Checksum:
-
Download URL:
-
File Type:
