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TRB's National Cooperative Highway Research Program (NCHRP) Web-Only Document 257: A Mechanistic–Empirical Model for Top–Down Cracking of Asphalt Pavements Layers develops a calibrated mechanistic-empirical (ME) model for predicting the load-related top-down cracking in the asphalt layer of flexible pavements. Recent studies have determined that some load-related fatigue cracks in asphalt pavement layers can be initiated at the pavement surface and propagate downward through the asphalt layer. However, this form of distress cannot entirely be explained by fatigue mechanisms used to explain cracking that initiates at the bottom of the pavement. This research explores top-down cracking to develop a calibrated, validated mechanistic-empirical model for incorporation into pavement design procedures.

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Suggested Citation

National Academies of Sciences, Engineering, and Medicine. 2018. A Mechanistic–Empirical Model for Top–Down Cracking of Asphalt Pavements Layers. Washington, DC: The National Academies Press. https://doi.org/10.17226/25304.

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Publication Info

213 pages |  8.5 x 11 |  DOI: https://doi.org/10.17226/25304
Chapters skim
Front Matter i-ix
Chapter 1. Introduction 1-3
Chapter 2. Synthesis of Current Knowledge 4-9
Chapter 3: Research Plan 10-15
Chapter 4: Findings 16-99
Chapter 5: Interpretations, Appraisal, and Applications 100-107
Chapter 6: Conclussions and Suggested Research 108-112
References 113-125
APPENDIX A. MEASUREMENT OF COMPLEX MODULUS GRADIENT USING DIRECT TENSION TEST 126-132
APPENDIX B. INVERSE APPROACH TO DERIVE COMPLEX MODULUS GRADIENT OF ASPHALT FIELD CORES 133-142
APPENDIX C. DERIVATION AND VALIDATION OF QUASI-ELASTIC SIMULATION OF VISCOELASTICITY 143-150
APPENDIX D. DETERMINATION OF FRACTURE COEFFICIENTS IN PSEUDO J-INTEGRAL BASED PARIS LAW 151-155
APPENDIX E. COLLECTION OF TOP-DOWN CRACKING DATA FOR MODEL DEVELOPMENT AND CALIBRATION 156-163
APPENDIX F. CATALOG OF FRACTURE PROPERTIES OF ASPHALT MIXTURES 164-165
APPENDIX G. CATALOG OF AGING PROPERTIES OF ASPHALT MIXTURES 166-168
APPENDIX H. CHARACTERIZATION OF THE TOP-DOWN CRACKING AMOUNT AND SEVERITY 169-174
APPENDIX I. PREDICTION OF TOP-DOWN CRACK INITIATION TIME AND DETERMINATION OF CALIBRATION COEFFICIENTS FOR DIFFERENT CLIMATE ZONES 175-179
APPENDIX J. RELATIONSHIP BETWEEN CRACK DEPTH AND CRACK WIDTH FOR A SURFACE CRACK 180-181
APPENDIX K. SENSITIVITY ANALYSIS OF TOP-DOWN CRACKING DESIGNING PROGRAM 182-185
APPENDIX L. THE COMPARISON OF PREDICTED RESULTS AND FIELD DATA 186-187
APPENDIX M. THE LIST OF NEW INPUT PARAMETERS FOR THE TOP-DOWN CRACKING DESIGNING PROGRAM 188-190
APPENDIX N. LIST OF ALL VARIABLES 191-199
APPENDIX O. MANUAL AND EXAMPLE OF TOP-DOWN CRACKING SOFTWARE 200-203

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