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An Investigation of the Endurance Limit of Hot-Mix Asphalt Concrete Using a New Uniaxial Fatigue Test Protocol
Final Report
University-Based Research, Education, and Technology Transfer Program
Contract NO. DTFH61-05-P-00159
Prepared for
Federal Highway Administration
U.S. Department of Transportation
By
Ali Soltani, Mansour Solaimanian, and David A. Anderson
The Pennsylvania Transportation Institute
The Pennsylvania State University
Transportation Research Building
University Park, PA 16802-4710
(814) 865-1891
http://www.pti.psu.edu/
May 31, 2006
PTI 2006-17
This work was sponsored by the U.S. Department of Transportation, Federal Highway Administration. The contents of this report reflect the views of the authors, who are responsible for the facts and the accuracy of the data presented herein. The contents do not necessarily reflect the official views or policies of the Federal Highway Administration, U.S. Department of Transportation. This report does not constitute a standard, specification, or regulation.
Acknowledgments
This project was funded by Federal Highway Administration contract FHWA DTFH61-05-P-00159. The support of Mr. John D'Angelo of the Federal Highway Administration is greatly appreciated. Mr. Darin Hunter is also acknowledged for assistance provided in the laboratory.
| 1. Report No. FHWA-HIF-07-002 |
2. Government Accession No. |
3. Recipient's Catalog No. |
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| 4. Title and Subtitle An Investigation of the Endurance Limit of Hot-Mix Asphalt Concrete Using a New Uniaxial Fatigue Test Protocol |
5. Report Date May 31, 2006 |
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| 6. Performing Organization Code | |||
| 7. Author(s) Ali Soltani, Mansour Solaimanian, and David A. Anderson |
8. Performing Organization Report No. 2006-17 |
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| 9. Performing Organization Name and Address The Pennsylvania Transportation Institute Transportation Research Building The Pennsylvania State University University Park, PA 16802-4710 |
10. Work Unit No. (TRAIS) |
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| 11. Contract or Grant No. DTFH61-05-P-00159 |
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| 12. Sponsoring Agency Name and Address Federal Highway Administration U.S. Department of Transportation Office of Acquisition Management 1200 New Jersey Avenue SE Washington, DC 20590 |
13. Type of Report and Period Covered Final Report 6/16/2005 - 12/31/2005 |
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| 14. Sponsoring Agency Code | |||
| 15. Supplementary Notes COTR: John D'Angelo, 202-366-0121 | |||
| 16. 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. |
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| 17. Key Words Fatigue, asphalt mixture, asphalt binder, uniaxial test, endurance limit |
18. Distribution Statement No restrictions. This document is available from the National Technical Information Service, Springfield, VA 22161 |
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| 19. Security Classification (of this report) Unclassified |
20. Security Classification (of this page) Unclassified |
21. No. of Pages 57 |
22. Price |
| Form DOT F 1700.7 | (8-72) | Reproduction of completed page authorized |
Table of Contents
- Introduction
- Objectives
- Literature Review
- Research Plan
- Test Equipment
- Materials and Specimen Preparation
- Experimental Results
- Discussion, Comments, and Findings
- Conclusions
- Recommendations
- References
- Appendix A: Properties of Tested Specimens
- Appendix B: Graphs Presenting Fatigue Testing Results
List of Figures
- Figure 1. Photograph of test fixtures, specimen, transducers and thermocouples.
- Figure 2. Location of thermocouples on the test specimen.
- Figure 3. Example of the effect of data synchronization on variability in the measured modulus.
- Figure 4. Schematic of temperature chamber and controller.
- Figure 5. Schematic of test fixture.
- Figure 6. Schematic of loading in Stages I, II, and III.
- Figure 7. Testing at specific strain levels to validate existence of the endurance limit.
- Figure 8. Air temperature in the environmental chamber during M32987 testing.
- Figure 9. M21673 specimen surface temperature at location TC2.
- Figure 10. Schematic demonstrating drift phenomenon.
- Figure 11. Drift during the test for specimen 21673.
- Figure 12. Drift during the test for specimen 21676.
List of Tables
- Table 1. Data acquisition schedule for each stage.
- Table 2. Properties of the mixtures prepared for this research.
- Table 3. Problems encountered during testing.
- Table 4. Specimens tested and the corresponding schedule.
- Table 5. Summary of results from the fatigue tests conducted in this research.
- Table 6. The change in modulus from Stage I to Stage III for different specimens.
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