Top-Down Cracking of Hot-Mix Asphalt Layers: Models for Initiation and Propagation (2010) / Chapter Skim
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1 EXECUTIVE SUMMARY It is well recognized that load-related top-down cracking, which initiates at or near the surface of the pavement and propagates downward, commonly occurs in hot mix asphalt (HMA) pavements.
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2 In this project, two models were identified and selected for integration into a unified predictive system because of their unique features and capabilities to address the dominant mechanisms associated with top-down cracking. The two models were as follows: • a viscoelastic continuum damage (VECD)
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3 VECD-FEP++ (which is a product of incorporating the VECD model into an in-house standalone finite element code FEP++) , and an extrapolation method was developed for predicting top-down cracking initiation in HMA pavements.
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4 reasonable predictions and expected trends for both crack initiation and propagation. A limited calibration/validation using data from field sections indicated that the performance model reasonably represents and accounts for the most significant factors that influence top-down cracking.
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