HMA Shear Resistance, Permanent Deformation, ... HMA SHEAR RESISTANCE, PERMANENT DEFORMATION, AND RUTTING

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  • Technical Report Documentation Page 1. Report No. FHWA/TX-13/0-6744-1

    2. Government Accession No.

    3. Recipient's Catalog No.

    4. Title and Subtitle HMA SHEAR RESISTANCE, PERMANENT DEFORMATION, AND RUTTING TESTS FOR TEXAS MIXES: YEAR-1 REPORT

    5. Report Date Published: April 2014 6. Performing Organization Code

    7. Author(s) Lubinda F. Walubita, Sang Ick Lee, Jun Zhang, Abu NM Faruk, Stan Nguyen, and Tom Scullion

    8. Performing Organization Report No. Report 0-6744-1

    9. Performing Organization Name and Address Texas A&M Transportation Institute College Station, Texas 77843-3135

    10. Work Unit No. (TRAIS) 11. Contract or Grant No. Project 0-6744

    12. Sponsoring Agency Name and Address Texas Department of Transportation Research and Technology Implementation Office 125 E. 11th Street Austin, Texas 78701-2483

    13. Type of Report and Period Covered Technical Report: September 2012–August 2013 14. Sponsoring Agency Code

    15. Supplementary Notes Project performed in cooperation with the Texas Department of Transportation and the Federal Highway Administration. Project Title: New HMA Shear Resistance and Rutting Test for Texas Mixes URL: http://tti.tamu.edu/documents/0-6744-1.pdf 16. Abstract

    Traditionally run at one test temperature (122°F), the Hamburg Wheel Tracking Test (HWTT) has a proven history of identifying hot-mix asphalt (HMA) mixes that are moisture susceptible and/or prone to rutting. However, with the record summer temperatures of the recent years, several shear and rutting failures have occurred with HMA mixes that had passed the HWTT in the laboratory; mostly in high shear locations, in particular with slow moving (accelerating/decelerating) traffic at controlled intersections, stop-go sections, in areas of elevated temperatures, heavy/high traffic loading, and/or where lower PG asphalt-binder grades have been used.

    As a supplement to the HWTT, this two-year study is being undertaken to develop a simpler and less time consuming shear resistance and permanent deformation (PD)/rutting test that is also cost-effective, repeatable, and produces superior results in terms of correlation with field rutting performance. In particular, such a test should have the potential to discriminate HMA mixes for application in high shear stress areas (i.e., intersections) as well as being an indicator of the critical temperatures at which a given HMA mix, with a given PG asphalt-binder grade, becomes unstable and more prone to rutting and/or shear failure.

    In line with these objectives, this interim report documents the research work completed in Year-1 of the study, namely: a) data search and literature review; b) computational modeling and shear stress-strain analysis; c) comparative evaluation of the Asphalt Mixture Performance Tester (AMPT) and the Universal Testing Machine (UTM); d) comparative evaluation of the Flow Number (FN), Dynamic Modulus (DM), and Repeated Load Permanent Deformation (RLPD) tests relative to the HWTT test method.

    17. Key Words HMA, Rutting, Shear, Permanent Deformation (PD), Stress, Strain, Visco-elastic, Hamburg (HWTT), UTM, AMPT, Flow Number (FN), Dynamic Modulus (DM), Repeated Load Permanent Deformation (RLPD), Finite Element (FE), Shear Strength, Modulus

    18. Distribution Statement No restrictions. This document is available to the public through NTIS: National Technical Information Service Alexandria, Virginia 22312 http://www.ntis.gov

    19. Security Classif.(of this report) Unclassified

    20. Security Classif.(of this page) Unclassified

    21. No. of Pages 152

    22. Price

    Form DOT F 1700.7 (8-72) Reproduction of completed page authorized

    http://tti.tamu.edu/documents/0-6744-1.pdf http://www.ntis.gov/

  • HMA SHEAR RESISTANCE, PERMANENT DEFORMATION, AND RUTTING TESTS FOR TEXAS MIXES: YEAR-1 REPORT

    by

    Lubinda F. Walubita Research Scientist

    Texas A&M Transportation Institute

    Sang Ick Lee Research Associate

    Texas A&M Transportation Institute

    Jun Zhang Research Associate

    Texas A&M Transportation Institute

    Abu NM Faruk Research Associate

    Texas A&M Transportation Institute

    Stan Nguyen Student Technician II

    Texas A&M Transportation Institute

    and

    Tom Scullion Senior Research Engineer

    Texas A&M Transportation Institute

    Report 0-6744-1 Project 0-6744

    Project Title: New HMA Shear Resistance and Rutting Test for Texas Mixes

    Performed in cooperation with the Texas Department of Transportation

    and the Federal Highway Administration

    Published: April 2014

    TEXAS A&M TRANSPORTATION INSTITUTE College Station, Texas 77843-3135

  • v

    DISCLAIMER

    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 view or policies of the Federal Highway Administration (FHWA) or the Texas

    Department of Transportation (TxDOT). This report does not constitute a standard, specification,

    or regulation, nor is it intended for construction, bidding, or permit purposes. The United States

    Government and the State of Texas do not endorse products or manufacturers. Trade or

    manufacturers’ names appear herein solely because they are considered essential to the object of

    this report. The researcher in charge was Lubinda F. Walubita.

  • vi

    ACKNOWLEDGMENTS

    This project was conducted for TxDOT, and the authors thank TxDOT and FHWA for

    their support in funding this research project. In particular, the guidance and technical assistance

    provided by the Project Manager, Darrin Jensen of TxDOT (RTI), proved invaluable. The

    following project advisors also provided valuable input throughout the course of the project: Joe

    Leidy, Gisel Carrasco, Ramon Rodriguez, and Mark Smith.

    Special thanks are also extended to David Contreras, Jesus M. Ipina, Jason Huddleston,

    Tony Barbosa, and Lee Gustavus from the Texas Transportation Institute (TTI) for their help

    with laboratory and field work. A word of gratitude is also conveyed to Fujie Zhou for the

    assistance with the Asphalt Mixture Tester (AMPT) at TTI.

  • vii

    TABLE OF CONTENTS

    List of Figures ................................................................................................................................ x List of Tables ............................................................................................................................... xii List of Notations and Symbols .................................................................................................. xiii Chapter 1 Introduction .......................................................................................................... 1-1

    Research Objectives ................................................................................................................. 1-1 Research Methodology and Work Plans .................................................................................. 1-1 Report Contents and Organizational Layout ............................................................................ 1-4 Summary ................................................................................................................................... 1-5

    Chapter 2 Data Search and Literature Review ................................................................... 2-1 Laboratory Tests Reviewed ...................................................................................................... 2-1

    The HWTT Test ............................................................................................................. 2-1 The RLPD Test .............................................................................................................. 2-3 The Unconfined DM Test .............................................................................................. 2-5 The Unconfined FT and FN Tests ................................................................................. 2-7 Other HMA Rutting and Shear Tests ............................................................................. 2-9

    Laboratory Tests Conducted in Study 0-6658 ........................................................................ 2-10 Summary ................................................................................................................................. 2-12

    Chapter 3 Computational Modeling and Shear Stress-Strain Analysis ........................... 3-1 PLAXIS 2-D FE Modeling: Linear Elastic Analysis ............................................................... 3-2

    The PLAXIS Software ................................................................................................... 3-2 PLAXIS Pavement Structures and Input Variables ....................................................... 3-3 PLAXIS Results: Vertical and Horizontal Displacements ............................................ 3-5 PLAXIS Results: Shear Stress-Strain Distributions ...................................................... 3-6 PLAXIS Data Analysis: Identification of Critical Factors that Influence Shear Defo

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