Top-Down Cracking of Hot-Mix Asphalt Layers: Models for Initiation and Propagation (2010) / Chapter Skim
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Pages 145-149

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From page 145...
... 141 CHAPTER 5 CONCLUSIONS AND RECOMMENDATIONS FOR FUTURE RESEARCH 5.1 Conclusions Two model components: (1) a VECD-based crack initiation model and (2)
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From page 146...
... 142 predicts transverse thermal stresses, which can be an important part of the top-down cracking mechanism; and (4) a pavement fracture model that predicts crack growth over time, accounting for the effect of changes in geometry on stress distributions.
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From page 147...
... 143 the MEPDG. Full integration of the two models is necessary for accurate performance prediction to establish the confidence needed for implementation of a reliable MEPDG.
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From page 148...
... 144 Phase One: As a minimum, the following considerations are recommended to develop a top-down cracking performance model for the MEPDG based on the two primary model components developed in this study: • Aging model: There is a need to unify the material property aging submodels developed for the VECD-based and HMA-FM-based component models, including submodels for viscoelastic properties and damage and fracture properties. • Healing model: There is a need to unify the healing submodels developed for the VECDbased and HMA-FM-based component models.
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From page 149...
... 145 • Generalized cracking mechanism: The VECD-FEP++ models top-down and bottom-up damage propagation simultaneously, but an algorithm to account for the interaction of these two cracking mechanisms in macro crack propagation (or, simultaneous damage and macro crack propagation) needs to be developed for determination of critical conditions.
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