Use of a Total Air Void Diffusion Depth to Improve Pavement Oxidation Modeling With Field Validation

摘要

Pavement oxidation modeling has been used to relate binder oxidation to pavement failure. The diffusion depth, a key parameter, defined as asphalt volume divided by accessible air void (AAV) surface area, is determined via X-ray computed tomography analysis. Analysis of nine field cores showed total air void (TAV) and AAV variation with depth to be generally similar; nevertheless, two cores had especially low AAV content in lower slices. Oxidation in these lower slices was not correspondingly low, suggesting the development of a new diffusion depth based on TAVs. Modeling using a TAV diffusion depth provided superior overall oxidation predictions.