Calcium Leaching Mechanism of Cementitious Materials in the Marine Environment
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 6
Abstract
Calcium leaching from cement hydrates has been shown to decrease the durability and shorten the service life of the concrete. Earlier studies have focused on investigating the leaching progress in deionized water or ammonium nitrate solutions, neglecting the effects of aggressive ion concentrations, types, and temperatures. In addition, the current equilibrium curve of calcium leaching is based on experimental data in deionized water, and its applicability to calcium leaching in actual marine environments is controversial. In this study, a dissolution experiment was carried out to study the effects of chloride ion concentrations and environmental temperatures. The functional relationship of critical parameters (, , and ) of the equilibrium curves with the chloride ion concentrations and temperatures was established. Furthermore, considering the influence of calcium leaching on porosity and the diffusion coefficient of cementitious materials, the calcium leaching model was established within a time and space framework. The results showed that calcium leaching was accelerated by the increased concentration of chloride ions and the decrease in environmental temperature. In the authors’ view, this study lays a theoretical foundation for a transport-reaction-mechanical deterioration model of concrete.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This work was supported by the National Key Research and Development Program of China (Grant No. 2021YFF0500801), the National Science Fund for Distinguished Young Scholars (Grant No. 52025081), the National Natural Science Foundations of China (Grant Nos. 51978211 and 52108234), the Shenzhen Science and Technology Program (Grant No. RCYX20200714114525013), and the Fundamental Research Fund for the Central Universities (Grant No. HIT.BRET.2021012).
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Published In
Journal of Materials in Civil Engineering
Volume 35 • Issue 6 • June 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: May 12, 2022
Accepted: Oct 4, 2022
Published online: Mar 25, 2023
Published in print: Jun 1, 2023
Discussion open until: Aug 25, 2023
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