Influence of pH on chloride binding isotherms for cement paste and its components
Author | Jain, A. |
Author | Gencturk, B. |
Author | Pirbazari, M. |
Author | Dawood, M. |
Author | Belarbi, A. |
Author | Sohail, M.G. |
Author | Kahraman, R. |
Available date | 2023-02-15T10:16:35Z |
Publication Date | 2021 |
Publication Name | Cement and Concrete Research |
Resource | Scopus |
Abstract | In this paper, chloride (Cl−) binding isotherms are developed for cement hydration compounds, specifically, calcium-silicate-hydrates (CSH) and AFm phases including mono-sulfate aluminate, hydroxy-AFm, monocarbonate-AFm, and hemicarbonate-AFm, in simulated concrete pore solutions to account for the effect of pH and the presence of other ions. pH and the presence of other ions have a strong influence on the Cl− binding capacity of cement compounds, which have not been taken into consideration in previous research. A novel experimental technique is developed to characterize the binding capacity from very low (1 mM) to very high concentrations (5 M). To overcome the existing challenges of measuring both low and high Cl− concentrations without significant dilution and in the presence of SO42− and OH− ions, a potentiometric method was used. The amorphous CSH in the hydrated cement paste; thus, the heterogeneity of the hydrated components of the cement paste was also quantified and accounted for in this study. |
Sponsor | The funding for this research was provided partly by the National Priorities Research Program of the Qatar National Research Fund (a member of the Qatar Foundation) under the award no. NPRP 7-410-2-169 and the United States National Science Foundation under the award no. 1642488 . The authors thank Professor Melot, Professor Marinescu, their students: Nicholas H. Bashian and Eric Johnson, and Mohit Dave at the University of Southern California for providing access to their laboratory facilities to perform some of the experiments described in this paper. Authors are also grateful to Lafarge, U.S. for donating the cement used in the experimental work. |
Language | en |
Publisher | Elsevier |
Subject | AFm Cement hydration Chloride binding isotherm CSH Hydroxyl ion binding pH |
Type | Article |
Volume Number | 143 |
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Center for Advanced Materials Research [1375 items ]
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Chemical Engineering [1172 items ]