NCHRP Report 646: Validating the Fatigue Endurance Limit for Hot Mix Asphalt

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Table of Contents
Front Matter R1-R11
Summary 1-4
Introduction 5-5
Scope 6-6
Arguments for the Existence of the Endurance Limit 7-8
Strategies to Produce Long-Life Pavements 9-11
Laboratory Fatigue Tests and Analysis Methods 12-12
Modeling Fatigue and Relationship to Field Performance 13-14
Introduction 15-15
Materials 16-16
Test Methods 17-19
Extrapolation Methods to Predict Fatigue Life 20-31
Existence of the Endurance Limit 32-40
Estimate of Precision of Beam Fatigue Tests 41-41
Indirect Tensile Strength as a Surrogate for Endurance Limit Determination 42-43
Dynamic Modulus and Phase Angle Master Curves 44-48
Damage Characteristic Curve 49-52
Evaluation of Endurance Limit 53-58
Including the Endurance Limit Design Premise into Mechanistic-Empirical-Based Pavement Design Procedures 59-61
Defining the Endurance Limit - A Survivability Analysis 62-65
Updated Survivability Analysis Using LTPP Data 66-72
Estimate of Shift Factors between Laboratory Tests and Field Performance 73-82
Sensitivity of Mechanistic-Empirical Pavement Design Methods to the Endurance Limit 83-87
Considerations for Incorporating the Endurance Limit into M-E Design Procedures 88-90
Recommendations 91-92
References 93-95
Appendix A - Proposed Standard Practice for Predicting the Endurance Limit of Hot Mix Asphalt (HMA) for Long-Life Pavement Design 96-104
Appendix B - Proposed Standard Practice for Predicting the Endurance Limit of Hot Mix Asphalt (HMA) by Pseudo Strain Approach 105-110
Appendix C - Proposed Standard Practice for Extrapolating Long-Life Beam Fatigue Tests Using the Ratio of Dissipated Energy Change (RDEC) 111-115
Appendix D - NCHRP 9-38 Beam Fatigue 116-120
Appendix E - Construction of Characteristic Curve 121-125
Appendix F - NCHRP 9-38 Beam Fatigue Round Robin 126-127
Abbreviations used without definitions in TRB publications 128-128

Table of Contents

Front Matter R1-R11

Summary 1-4

Introduction 5-5

Scope 6-6

Arguments for the Existence of the Endurance Limit 7-8

Strategies to Produce Long-Life Pavements 9-11

Laboratory Fatigue Tests and Analysis Methods 12-12

Modeling Fatigue and Relationship to Field Performance 13-14

Introduction 15-15

Materials 16-16

Test Methods 17-19

Extrapolation Methods to Predict Fatigue Life 20-31

Existence of the Endurance Limit 32-40

Estimate of Precision of Beam Fatigue Tests 41-41

Indirect Tensile Strength as a Surrogate for Endurance Limit Determination 42-43

Dynamic Modulus and Phase Angle Master Curves 44-48

Damage Characteristic Curve 49-52

Evaluation of Endurance Limit 53-58

Including the Endurance Limit Design Premise into Mechanistic-Empirical-Based Pavement Design Procedures 59-61

Defining the Endurance Limit - A Survivability Analysis 62-65

Updated Survivability Analysis Using LTPP Data 66-72

Estimate of Shift Factors between Laboratory Tests and Field Performance 73-82

Sensitivity of Mechanistic-Empirical Pavement Design Methods to the Endurance Limit 83-87

Considerations for Incorporating the Endurance Limit into M-E Design Procedures 88-90

Recommendations 91-92

References 93-95

Appendix A - Proposed Standard Practice for Predicting the Endurance Limit of Hot Mix Asphalt (HMA) for Long-Life Pavement Design 96-104

Appendix B - Proposed Standard Practice for Predicting the Endurance Limit of Hot Mix Asphalt (HMA) by Pseudo Strain Approach 105-110

Appendix C - Proposed Standard Practice for Extrapolating Long-Life Beam Fatigue Tests Using the Ratio of Dissipated Energy Change (RDEC) 111-115

Appendix D - NCHRP 9-38 Beam Fatigue 116-120

Appendix E - Construction of Characteristic Curve 121-125

Appendix F - NCHRP 9-38 Beam Fatigue Round Robin 126-127

Abbreviations used without definitions in TRB publications 128-128