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HMA Shear Resistance, Permanent Deformation, and Rutting Tests for Texas Mixes: Year-1 Report

2014

(FHWA/TX-13/0-6744-1)

/ by Lubinda F. Walubita [and five others]

https://library.ctr.utexas.edu/hostedpdfs/tti/0-6744-1.pdf

4.6 MB

Hard copy + Online document,

1 volume (152 pages)

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 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.

"Published: April 2014"

Chapter 1. Introduction --
Chapter 2. Data Search and Literature Review --
Chapter 3. Computational Modeling and Shear Stress-Strain Analysis --
Chapter 4. The AMPT versus the UTM System --
Chapter 5. Comparative Evaluation of the RLPD, FN, and DM Test Methods --
Chapter 6. Summary, Recommendations, and Future Work --
Appendix A. List of Laboratory Tests Reviewed --
Appendix B. The PLAXIS Software (2-D FE Linear Elastic Analysis) and Results --
Appendix C. The ABAQUS Software (3-D FE Visco-Elastic Analysis) and Results --
Appendix D. Comparative Evaluation of the AMPT and UTM Systems --
Appendix E. Additional Data and Results for the FN, DM, and RLPD Tests --
Appendix F. Workplans for Evaluating the HWTT Test Method, Tex-242-F Specification, and Preliminary Results --
Appendix G. Work Plans for the Development of the Simple Punching Shear Test (SPST) and Preliminary Results

TxDOT Research Project 0-6744

New HMA Shear Resistance and Rutting Test for Texas Mixes

Texas Transportation Institute

College Station, Texas

TTI

OCLC No.

881327946

Subject(s)

Asphalt pavements
Computer models
Deformation curve
Dynamic modulus of elasticity
Hot mix asphalt
Literature reviews
Repeated loads
Rutting
Shear strength
Test procedures

Texas

All Authors/Contributors

Walubita, Lubinda F.
Faruk, Abu N. M.
Lee, Sang Ick
Zhang, Jun (Of Texas A & M Transportation Institute)
Nguyen, Stanford Thien Phong
Scullion, Thomas

TxDOT Research Projects Database

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