Cumulative distress curve estimation from micromechanical asphalt model
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2018 Taylor & Francis Group, London. In this paper, a computational approach is proposed for the estimation of cumulative (dam-age) distress curves from micromechanical asphalt concrete response. X-ray computed tomography and digital image processing techniques are used to characterize the internal structure of an asphalt concrete core sample and finite element analysis is used to performance numerical analysis to characterize the mechanical behavior of the mesoscale structure. The cumulative distress curve is estimated as the probability of the distress driving force exceeding the critical distress initiation criterion in the mastic phase. The results show that realistic cumulative distress curves can be obtained using the proposed approach. The results also show that continuum damage material parameters can be reasonably estimated from the cumulative distress curves. The proposed approach presents the possibilities of developing further understanding of the relationship between phenomenological continuum damage model parameters and key mixture properties. Establishment of these relationships are essential for the development of performance-based asphalt mixture design.
