Technical Report Documentation Page 1. Report No. FHWA/TX-10/0-1777-3 2. Government Accession No. 3. Recipient's Catalog No. 4. Title and Subtitle TESTS OF HMA OVERLAYS USING GEOSYNTHETICS TO REDUCE REFLECTION CRACKING 5. Report Date February 2009 Published: December 2009 6. Performing Organization Code 7. Author(s) Arif Chowdhury, Joe W. Button, and Robert L. Lytton 8. Performing Organization Report No. Report 0-1777-3 9. Performing Organization Name and Address Texas Transportation Institute The Texas A&M University System College Station, Texas 77843-3135 10. Work Unit No. (TRAIS) 11. Contract or Grant No. Project 0-1777 12. Sponsoring Agency Name and Address Texas Department of Transportation Research and Technology Implementation Office P.O. Box 5080 Austin, Texas 78763-5080 13. Type of Report and Period Covered Technical Report: September 1999 - August 2007 14. Sponsoring Agency Code 15. Supplementary Notes Project performed in cooperation with the Texas Department of Transportation and the Federal Highway Administration. Project Title: Field Synthesis of Geotextiles in Flexible and Rigid Pavement Rehabilitation Strategies Including Cost Consideration URL: http://tti.tamu.edu/documents/0-1777-3.pdf 16. Abstract The primary objective of this field phase of the research project was to evaluate geosynthetic products placed under or within hot mix asphalt overlays to reduce the severity or delay the appearance of reflection cracks and to calibrate and validate FPS-19 Design Check. Multiple end-to-end test pavements incorporating geosynthetic products (fabrics, grids, and composites) and including control sections were constructed in three different regions of Texas (Amarillo, Waco, and Pharr Districts) with widely different climates and geological characteristics. Performance of these test pavements has been monitored for five to six years, depending on the date of construction. The oldest test pavements (Pharr) are exhibiting essentially no cracking. The Amarillo and Waco test pavements are exhibiting a fair amount of low severity and a very small amount of medium-severity reflective cracking. Based on measured cracks in the original pavement before overlaying, the percentage of reflective cracking in each test section was calculated and plotted with time of pavement in service. Calibration of FPS-19 Design Check could not be accomplished due to the absence of sufficient amount of cracks with medium-severity level. Instead, using the field data, relative life ratio of test sections was projected. Field specimens obtained from these test pavements were tested using the large overlay tester. Field monitoring revealed that some geosynthetic products are effective in delaying reflective cracking. They were relatively more effective in the Waco test pavement (concrete in mild climate) than the Amarillo test pavement (flexible in harsh climate). 17. Key Words Reflective Cracking, Geosynthetic, Geotextile, Fabric, Grid, Composite, Asphalt Overlay, FPS-19 18. Distribution Statement No restrictions. This document is available to the public through NTIS: National Technical Information Service Springfield, Virginia 22161 http://www.ntis.gov 19. Security Classif.(of this report) Unclassified 20. Security Classif.(of this page) Unclassified 21. No. of Pages 100 22. Price Form DOT F 1700.7 (8-72) Reproduction of completed page authorized
TESTS OF HMA OVERLAYS USING GEOSYNTHETICS TO REDUCE REFLECTION CRACKING
May 30, 2023
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