The system CaO-Al2O3-CaCl2-H2O at 23±2 °C and the mechanisms of chloride binding in concrete |
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| Authors: | Paul Brown James Bothe Jr. |
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| Affiliation: | Department of Materials Science and Engineering, Penn State University, 136 MRL, University Park PA 16802, USA |
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| Abstract: | The stable quaternary diagram for the system CaO-Al2O3-CaCl2-H2O at 23±4 °C has been constructed. Among the phases in this system are the calcium oxychlorides Ca(OH)2.CaCl2.H2O and 3Ca(OH)2.CaCl2.12H2O. The formation of Friedel's salt (FS) and calcium oxychlorides provides a mechanism for chloride binding in Portland cement concrete. The compatibility relationships involving these compounds, FS and Ca(OH)2, were established empirically, and 3Ca(OH)2.CaCl2.12H2O was found not to coexist in equilibrium with FS. The solubility behaviors of these compounds may play a role in affecting temperature-dependent corrosion rates. Additionally, the formation of oxychlorides from solutions containing elevated concentrations of NaCl may provide a mechanism by which ASR is facilitated. |
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| Keywords: | Friedel's salt Calcium oxychloride Corrosion ASR |
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