The performance of flexible and rigid pavements is known to be closely related to properties of the base, subbase, and/or subgrade. However, some recent research studies indicate that the performance predicted by this methodology shows a low sensitivity to the properties of underlying layers and does not always reflect the extent of the anticipated effect, so the procedures contained in the American Association of State Highway and Transportation Officials’ (AASHTO’s) design guidance need to be evaluated.
NCHRP Web-Only Document 264: Proposed Enhancements to Pavement ME Design: Improved Consideration of the Influence of Subgrade and Unbound Layers on Pavement Performance proposes and develops enhancements to AASHTO's Pavement ME Design procedures for both flexible and rigid pavements, which will better reflect the influence of subgrade and unbound layers (properties and thicknesses) on the pavement performance.
Table of Contents
|CHAPTER 1. INTRODUCTION||1-2|
|CHAPTER 2. SYNTHESIS OF CURRENT KNOWLEDGE||3-17|
|CHAPTER 3. RESEARCH PLAN||18-22|
|CHAPTER 4. FINDINGS||23-96|
|CHAPTER 5. INTERPRETATIONS, APPRAISAL, AND APPLICATIONS||97-125|
|CHAPTER 6. SUMMARY||126-130|
|Appendix A. Annotated Bibliography of Influence of Unbound Layers and Subgrade||145-152|
|Appendix B. Definitions of Model Parameters of Unbound Layer and Subgrade Models||153-163|
|Appendix C. Evaluation and Screening of Unbound Layer and Subgrade Models||164-173|
|Appendix D. Moisture-Sensitive, Stress-Dependent, and Cross- Anisotropic Resilient Modulus||174-179|
|Appendix E. Slab-Base Interface Shear Bonding Model||180-184|
|Appendix F. Sensitivity Analysis of Modulus of Subgrade Reaction Model||185-187|
|Appendix G. Determination of Stress State in the Faulting Model||188-191|
|Appendix H. Categorization of Traffic Loads State in the Faulting Model||192-197|
|Appendix I. Subgrade Subroutine for Flexible and Rigid Pavements||198-202|
|Appendix J. Unbound Base Course Subroutine for Flexible Pavements||203-206|
|Appendix K. Unbound Base Course Subroutine for Rigid Pavements||207-209|
|Appendix L. Rigid Pavement Structure Model Subroutine||210-211|
|Appendix M. Conversion 2-Layer Model for Rigid Pavements Subroutine||212-220|
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