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Development and Application of the Asphalt Mix Performance Tester

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Development and Application of the Asphalt Mix Performance Tester

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    2. Outline What is the Asphalt Mixture Performance Tester? Why was it developed? What tests can be conducted? How can I use the data? What’s next?

    3. What is the AMPT? NCHRP 9-29 Servo-Hydraulic Machine HMA Testing Mix Design Structural Design Evaluation I also think that it is appropriate to acknowledge various groups that have contributed to the information that I will present today. First the agencies that have sponsored and guided the work that I will attempt to summarize, particularly the Federal Highway Administration and the various State Departments of Transportation. As major users of bituminous materials, they have sponsored most of the research associated with this material. Second are all of colleagues that I have worked with on the National Cooperative Highway Research Program Projects 1-37A developing the AASHTO 2002 Pavement Design Guide, and Project 9-19 dealing with modeling asphalt mixture performance. Finally, I would like to acknowledge the efforts of all those who have contributed to the the literature and our growing body of knowledge particularly in the areas of asphalt mixtures and pavement structural design. I also think that it is appropriate to acknowledge various groups that have contributed to the information that I will present today. First the agencies that have sponsored and guided the work that I will attempt to summarize, particularly the Federal Highway Administration and the various State Departments of Transportation. As major users of bituminous materials, they have sponsored most of the research associated with this material. Second are all of colleagues that I have worked with on the National Cooperative Highway Research Program Projects 1-37A developing the AASHTO 2002 Pavement Design Guide, and Project 9-19 dealing with modeling asphalt mixture performance. Finally, I would like to acknowledge the efforts of all those who have contributed to the the literature and our growing body of knowledge particularly in the areas of asphalt mixtures and pavement structural design.

    4. AMPT Capabilities Three Performance Related Tests Dynamic Modulus Repeated Load Creep Temperature Control 4 to 60 °C With and Without Confinement 210 kPa Max

    5. Key AMPT Features Rugged Proven Hydraulic System Automated Testing Cell Temperature Confining Pressure Easy to Install Instrumentation Standard Software Testing and Analysis Data Quality Technician Friendly

    6. Why Do We Need the AMPT? Test to Indicate How a Mix Will Perform Rutting Cracking Uses Identify Inferior Mixtures Structural Design Evaluations

    7. SHRP Mixture Tests

    8. Issues With SHRP Products

    9. Post SHRP National Cooperative Highway Research Program (NCHRP) Considered Gyratory Compactor Asphalt Pavement Analyzer Fundamental Tests

    10. Recommended Tests

    11. Dynamic Modulus Test

    12. Repeated Load Test

    13. Creep Test

    14. SPT Uses Dynamic Modulus Master Curve for Structural Design AASHTO MEPDG Mixture Design NCHRP Project 9-33 “Mix Design Manual for Hot Mix Asphalt” Material Evaluations Homogenity of RAP Mixtures

    15. Pavement Structural Design AASHTO Mechanistic-Empirical Pavement Design Guide HMA Characterized by a Dynamic Modulus Master Curve Plant Aged Conditions Modulus Needed Stress-Strain Analysis Rutting Model Fatigue Cracking Model

    17. NCHRP 9-29 Draft Practice Developing Dynamic Modulus Master Curves for Hot-Mix Asphalt Concrete Using the Asphalt Mixture Performance Tester Testing Conditions Temperature Frequency Replicates Data Analysis Excel Spreadsheet

    18. Rutting Resistance Shear Deformation - Major Densification - Minor High Temperatures Early in Pavement Life

    19. Repeated Load Test

    20. NCHRP 9-33 Tentative Criteria Stress Level 600 kPa (87 psi) Database of Mixtures Tested by FHWA Temperature 50 % Reliability Design Temperature From LTPPBind 3.1 Short Testing Time

    21. NCHRP 9-33 Tentative Criteria

    22. Mixture Homogenity How Well Does the RAP/RAS Binder Mix with the New Binder? Black Rock Complete Mixing

    23. One Tool Dynamic Modulus Test Is Highly Sensitive to Binder Stiffness Assess Degree of Mixing of New and Recycled Binders Relatively Easy to Perform with the AMPT

    24. How? Perform Dynamic Modulus Tests on Plant Produced Mixture Plant Mixed Condition Recover Binder, Test and Estimate Dynamic Modulus Using Predictive Model Fully Blended Condition Compare Measured and Estimated

    25. Good Mixing

    26. Poor Mixing

    27. Implementation Interlaboratory Study NCHRP 9-29 Pooled Fund Study 5(178) Purchase Equipment for Interested Agencies 2 Day Training Course Coordinated Studies Improve Criteria

    28. AMPT Summary Specifically for HMA Testing Three Performance Related Tests Dynamic Modulus Repeated Load Creep Fatigue Test Under Development User Friendly, Second Generation Mixture Performance Testing Equipment Extensive National Efforts to Develop and Implement

    29. AMPT Uses Dynamic Modulus Master Curve for Structural Design AASHTO MEPDG Mixture Design NCHRP Project 9-33 “Mix Design Manual for Hot Mix Asphalt” Material Evaluations Homogenity of RAP Mixtures Forensics Others

    30. Questions

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