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A Mechanistic–Empirical Model for Top–Down Cracking of Asphalt Pavements Layers (2018)

Chapter: APPENDIX L. THE COMPARISON OF PREDICTED RESULTS AND FIELD DATA

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Page 186
Suggested Citation:"APPENDIX L. THE COMPARISON OF PREDICTED RESULTS AND FIELD DATA." 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. doi: 10.17226/25304.
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Page 186
Page 187
Suggested Citation:"APPENDIX L. THE COMPARISON OF PREDICTED RESULTS AND FIELD DATA." 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. doi: 10.17226/25304.
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Page 187

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L-1 APPENDIX L. THE COMPARISON OF PREDICTED RESULTS AND FIELD DATA In Appendix L, the predicted distress curves and the measured field distress curves are compared for a total of four pavement sections as typical examples in four climatic zones. Specifically, both of the top-down cracking initiation model and the calibration model are used with the known materials properties, pavement structures, traffic load spectra and weather information to predict the distress curves. Generally, the predictions for pavement sections in WNF and DNF zones have better accuracy than those in WF and DF zones. As seen from Figure L-1, the differences are within a reasonable range, which indicates the accuracy of this model. (a) Section 48-3669 (WNF Zone) (b) Section 19-0108 (WF Zone) 0 10 20 30 40 50 60 70 80 90 0 1000 2000 3000 4000 5000L on gi tu di na l C ra ck in g  Le ng ht  (m ) Service Time  (day) Measured Predicted 0 10 20 30 40 50 60 70 0 1000 2000 3000 4000 5000 6000 Lo ng itu di na l C ra ck in g  Le ng ht  (m ) Service Time  (day) Measured Predicted

L-2 (c) Section 4-0122 (DNF Zone) (d) Section 32-0101 (DF Zone) Figure L-1. Predicted and Measured Longitudinal Crack Length 0 20 40 60 80 100 120 140 0 500 1000 1500 2000 2500 3000 3500 Lo ng itu di na l C ra ck in g  Le ng ht  (m ) Service Time  (day) Measured Predicted 0 5 10 15 20 25 30 35 40 45 0 500 1000 1500 2000 2500 3000 3500 4000 Lo ng itu di na l C ra ck in g  Le ng ht  (m ) Service Time  (day) Measured Predicted

Next: APPENDIX M. THE LIST OF NEW INPUT PARAMETERS FOR THE TOP-DOWN CRACKING DESIGNING PROGRAM »
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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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