Study on Moisture Diffusion Behavior in Asphalt Binder Based on Static and Dynamic Pore Water Conditions
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 8
Abstract
The current research on the moisture diffusion behavior in asphalt mostly discusses static water without considering dynamic pore water. In this paper, Fick, Two-stage, and Langmuir moisture diffusion models were used to compare and analyze the diffusion behavior of static water and dynamic pore water in asphalt, and the effects of polar component content on moisture diffusion behavior was quantitatively analyzed. The results show that: (1) dynamic pore water significantly increases the moisture diffusion coefficient of the entire diffusion process; (2) the Langmuir moisture diffusion model, which considers the interaction between moisture and the polar components of asphalt, can very accurately characterize the moisture diffusion behavior in the asphalt binder; and (3) the asphaltene (polar components) content is positively correlated with the amount of asphalt moisture absorption, especially the bound phase moisture.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
Authors would like to acknowledge the following financial support: the National Natural Science Foundation of China (No. 51878574); Sichuan Science and Technology Program (No. 2021JDTD0023); and Sichuan Science and Technology Program (No. 2021YJ0065). In addition, the authors acknowledge Highway Engineering Key Laboratory of Sichuan Province for providing the equipment and premises.
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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: Oct 7, 2021
Accepted: Dec 16, 2021
Published online: May 25, 2022
Published in print: Aug 1, 2022
Discussion open until: Oct 25, 2022
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