Development and Validation of the Coupled Diffusion-Kinetics Aging Model to Analyze Field Aging Gradient in Asphalt Pavements
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 8
Abstract
Ultraviolet (UV) radiation and thermal oxidation are two leading causes of the aging of asphalt pavements. However, there is a lack of a suitable analytical model to consider both when the field aging gradient of asphalt pavement is analyzed. This work develops a framework of using coupled diffusion-kinetics aging model (CDKAM) to quantify the field aging gradient in asphalt pavements, which considers the influence of both UV and thermal conditions. First, the general diffusion model based on Fick’s second law is proposed to analyze asphalt aging extent and aging gradient due to UV radiation. Then, the kinetics model that could quantify the thermal aging of asphalt is revised and coupled with the diffusion model to develop the CDKAM. Both the diffusion model and CDKAM are validated using the experimental data from the literature. The results exhibit the efficacy of using the diffusion model to analyze the asphalt aging gradient under UV radiation. The CDKAM is demonstrated to be an effective model in assessing the field aging gradient in asphalt pavements. The required inputs for CDKAM are discussed, and future works are recommended to improve the accuracy of using the CDKAM to predict the field aging in asphalt pavements.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors would like to acknowledge the support from the California State University System Research, Scholarly & Creative Activities (RSCA) Grant Program and the support of NVIDIA Corporation with the donation of the graphics processing unit (GPU) used in this work.
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Published In
Journal of Materials in Civil Engineering
Volume 34 • Issue 8 • August 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Sep 24, 2021
Accepted: Dec 27, 2021
Published online: May 28, 2022
Published in print: Aug 1, 2022
Discussion open until: Oct 28, 2022
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