NCHRP Report 673: A Manual for Design of Hot-Mix Asphalt with Commentary

TRB’s National Cooperative Highway Research Program (NCHRP) Report 673: A Manual for Design of Hot-Mix Asphalt with Commentary incorporates the many advances in materials characterization and hot-mix asphalt (HMA) mix design technology developed since the conclusion of the Strategic Highway Research Program (SHRP).The final report on the project that developed NCHRP Report 673 and Appendixes C through F to NCHRP Report 673 were published as NCHRP Web-Only Document 159. The titles of the appendixes are as follows:• Appendix C: Course Manual• Appendix D: Draft Specification for Volumetric Mix Design of Dense-Graded HMA• Appendix E: Draft Practice for Volumetric Mix Design of Dense-Graded HMA• Appendix F: TutorialThe companion Excel spreadsheet HMA tool and the training course materials described in NCHRP Report 673 are available for download from the Internet. TRB’s National Cooperative Highway Research Program (NCHRP) Report 673: A Manual for Design of Hot Mix Asphalt with Commentary explores a mix design manual for hot-mix asphalt (HMA) that incorporates the many advances in materials characterization and mix design technology developed since the conclusion of the Strategic Highway Research Program (SHRP). The final report on the project that developed NCHRP Report 673 and Appendixes C through F to NCHRP Report 673 were published as NCHRP Web-Only Document 159. The titles of the appendixes are as follows: • Appendix C: Course Manual • Appendix D: Draft Specification for Volumetric Mix Design of Dense-Graded HMA • Appendix E: Draft Practice for Volumetric Mix Design of Dense-Graded HMA • Appendix F: Tutorial The companion Excel spreadsheet HMA tool and the training course materials described in NCHRP Report 673 are available for download from the Internet. NCHRP Report 673 – A Manual for Design of Hot Mix Asphalt with Commentary 1 Next Page -1 Previous Page -1 =============== -1 Project Description -1 Report Web Page -1 =============== -1 Transportation Research Board 2011 Executive Committee 2 A Manual for Design of Hot Mix Asphalt with Commentary 3 About the National Academies 5 NCHRP Project 9-33 Panel 6 Foreword 7 Contents 9 Chapter 1 - Introduction 12 Chapter 2 - Background 15 Materials Used in Making Asphalt Concrete 15 Asphalt Concrete Pavements 16 How Asphalt Concrete Pavements Fail 18 Asphalt Concrete Mixtures 21 HMA Mix Design Methods 23 Chapter 3 - Asphalt Binders 26 Performance Grading of Asphalt Binders—Overview 28 Performance Grading—Test Methods 28 Performance Grading—Specification 33 Critical Temperatures, Specification Values, and Reliability 35 Practical Selection of PG Binder Grades for HMA Mix Design 37 Chapter 4 - Aggregates 39 Aggregate Particle Size Distribution 39 Aggregate Specific Gravity and Absorption 44 Aggregate Specification Properties 49 Source Aggregate Properties 54 Chapter 5 - Mixture Volumetric Composition 57 Composition Factors 57 Mixture-Specific Gravity 64 Volumetric Analysis 67 Chapter 6 - Evaluating the Performance of Asphalt Concrete Mixtures 76 Mixture Composition and Performance 77 Laboratory Testing 82 Performance Predictions Using the AASHTO Mechanistic-Empirical Pavement Design Guide (MEPDG) 93 Chapter 7 - Selection of Asphalt Concrete Mix Type 102 Pavement Structure and Construction 102 Important Factors in Mix Selection 106 Recommended Mix Types 109 Chapter 8 - Design of Dense-Graded HMA Mixtures 112 Other Mix Design Methods 112 Overview of Design Method 117 Step 1. Gather Information 118 Step 2. Select Asphalt Binder 119 Step 3. Determine Compaction Level 122 Step 4. Select Nominal Maximum Aggregate Size 122 Step 5. Determine Target VMA and Design Air Void Content 123 Step 6. Calculate Target Binder Content 125 Step 7. Calculate Aggregate Content 125 Step 8. Proportion Aggregates for Trial Mixtures 125 Step 9. Calculate Trial Mix Proportions by Weight and Check Dust/Binder Ratio 135 Step 10. Evaluate and Refine Trial Mixtures 139 Step 11. Compile Mix Design Report 156 Chapter 9 - Reclaimed Asphalt Pavement 159 General Mixture Design Considerations for RAP 159 Overview of the Mixture Design Process with RAP 161 A Note on General Methods of Handling RAP 162 Using HMA Tools to Design HMA Mixes with RAP 162 RAP Sampling 163 Blending and Variability 164 RAP Aggregate Properties 172 RAP Binder Properties 175 Handling RAP Materials in the Laboratory 181 Chapter 10 - Design of Gap-Graded HMA Mixtures 185 Overview of GGHMA Mix Design Procedure 185 Step 1—Materials Selection 187 Step 2—Trial Gradations 190 Step 3—Selection of Optimum Gradation 199 Step 4—Refine Design Asphalt Binder Content 200 Step 5—Conduct Performance Testing 200 Trouble Shooting GGHMA Mix Designs 202 Chapter 11 - Design of Open-Graded Mixtures 205 Overview of PFC Mix Design Procedure 206 Step 1—OGFC Materials Selection 206 Step 2—Trial Gradations 209 Step 3—Selection of Optimum Gradation 214 Step 4—Selection of Optimum Asphalt Binder Content 214 Step 5—Moisture Susceptibility 216 Trouble Shooting PFC Mix Designs 216 Chapter 12 - Field Adjustments and Quality Assurance of HMA Mixtures 218 Adjusting Laboratory HMA Mix Designs for Plant Production 218 Quality Control of HMA 222 Commentary to the Mix Design Manual for Hot Mix Asphalt 236 Chapter 1 - Introduction 237 Chapter 2 - Background 238 Chapter 3 - Asphalt Binders 239 Chapter 4 - Aggregates 240 Chapter 5 - Mixture Volumetric Composition 242 Chapter 6 - Evaluating the Performance of Asphalt Concrete Mixtures 243 Chapter 7 - Selection of Asphalt Concrete Mix Type 251 Chapter 8 - Design of Dense-Graded HMA Mixtures 252 Chapter 9 - Reclaimed Asphalt Pavement 264 Chapter 10 - Design of Gap-Graded HMA Mixtures 276 Chapter 11 - Design of Open-Graded Mixtures 277 Chapter 12 - Field Adjustments and Quality Assurance of HMA Mixtures 278 References 282 Abbreviations used without definitions in TRB publications 285 Design;,Materials;,Pavement;,Highways Design,Materials,Pavement,Highways "TRB's National Cooperative Highway Research Program (NCHRP) Report 673: A Manual for Design of Hot-Mix Asphalt with Commentary incorporates the many advances in materials characterization and hot-mix asphalt (HMA) mix design technology developed since the conclusion of the Strategic Highway Research Program (SHRP). The final report on the project that developed NCHRP Report 673 and Appendixes C through F to NCHRP Report 673 were published as NCHRP Web-Only Document 159"--Publisher's description