Technical Report Documentation Page 1. Report No. FHWA/TX-09/0-6037-1 2. Government Accession No. 3. Recipient's Catalog No. 4. Title and Subtitle SUBBASE AND SUBGRADE PERFORMANCE INVESTIGATION FOR CONCRETE PAVEMENT 5. Report Date January 2009 Published: May 2009 6. Performing Organization Code 7. Author(s) Youn su Jung, Dan G. Zollinger, Moon Won, and Andrew J. Wimsatt 8. Performing Organization Report No. Report 0-6037-1 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 0-6037 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 2007-September 2008 14. Sponsoring Agency Code 15. Supplementary Notes Project performed in cooperation with the Texas Department of Transportation and the Federal Highway Administration. Project Title: Alternatives to Asphalt Concrete Pavement Subbases for Concrete Pavement URL: http://tti.tamu.edu/documents/0-6037-1.pdf 16. Abstract Recently, TxDOT has become increasingly aware of the rising cost associated with the use of asphalt concrete bond breakers to meet the FHWA requirement of using a permanently stabilized, nonerodable subbase layer below the concrete slab. The main issue associated with this research is if cheaper alternatives are available for subbase construction. Subbase layers have certain functions that need to be fulfilled (one of them being constructability) in order to assure adequate pavement performance. One key aspect is resistance to erosion, and assessment of each of these functions relative to different alternatives is key to understanding the capability of different alternatives to perform adequately. In this respect, this project is to examine the design assumptions associated with each alternative and provide recommendations accordingly to include test methods and material specifications. This report describes some of the work accomplished summarizing data on subbase performance and testing relative to concrete pavement subbase and subgrade erosion. Findings from investigations are discussed to identify factors associated with erosion in the field based on various analysis methods such as load transfer efficiency (LTE), effective thickness, and ground penetrating radar (GPR). An approach to mechanistically consider the erosion process is introduced and review of current design procedures was also conducted as to how they address erosion. This review was extended to address erosion models included in the literature in terms of the relationship between measurable material properties and performance. Moreover, previous and current laboratory test methods for erosion testing are summarized and the test results of selected alternative subbase materials are discussed. Finally, the relation between k-value and slab behavior is discussed. 17. Key Words Subbase Material, Erosion, Field Performance, Concrete Pavement, k-value, GPR, FWD, DCP, Static Plate Load Test 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 112 22. Price Form DOT F 1700.7 (8-72) Reproduction of completed page authorized
SUBBASE AND SUBGRADE PERFORMANCE INVESTIGATION FOR CONCRETE PAVEMENT
May 06, 2023
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