Single-Pipe Model of Oxygen Diffusion in Unsaturated Cement Pastes: Comprehensive Analysis of Surface, Knudsen, Bulk, Transition, and Water-Curtain Diffusion
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 10
Abstract
One of the most important factors affecting the durability of concrete structures is reinforcement corrosion, which is caused by oxygen concentration. Therefore, it is important to investigate oxygen diffusion in cement pastes. However, current research on oxygen diffusion models of unsaturated cement pastes has led to unclear conclusions. In this study, we propose a single-pipe oxygen diffusion model that considers five diffusion mechanisms: surface, Knudsen, transition, bulk, and water curtain. Further, a three-stage method is used to set up the model, and the division mode of this method is based on the mean free path (MFP) and the Mohycan model. The accuracy of the model is verified by comparing the calculated results with the experimental data. The proposed single-pipe model can be used to further analyze the durability degradation of reinforced concrete structures caused by steam, carbon dioxide, and other gases in the atmospheric environment.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This project has been supported by the National Natural Science Foundation of China (No. 52108216), the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (No. 19KJB560004), the China Postdoctoral Science Foundation (Nos. 2019M661693 and 2021T140115), the Open Foundation of the State Key Laboratory of High Performance Civil Engineering Materials (No. 2021CEM004), the Natural Science Foundation of Shandong Province (No. 2019GSF110006), and the First-Class Discipline project funded by the Education Department of Shandong Province.
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Published In
Journal of Materials in Civil Engineering
Volume 34 • Issue 10 • October 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Mar 28, 2021
Accepted: Jan 31, 2022
Published online: Jul 22, 2022
Published in print: Oct 1, 2022
Discussion open until: Dec 22, 2022
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