Friedel's salt, Ca2Al(OH)(6)(Cl,OH)center dot 2H(2)O: Its solid solutions and their role in chloride binding

U A Birnin-Yauri, F P Glasser

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Abstract

Solubility relationships between Friedel's salt and hydroxy AF, suggest an essentially complete solid solution with only minor discontinuities. Solid-aqueous partitions were determined by equilibration of 11 compositions at 10 mol % intervals at similar to 20 degrees C in experiments of 6-17 months' duration. Aqueous chloride concentrations >2mM, approximately, are required to incorporate significant Cl in hydroxy AF(m); the process is complete, giving essentially pure Friedel's salt, at a chloride content of similar to 14 mM. The self-generated pH of the solid solutions are high: pH >12 for all compositions. The implications for diffusion of chloride ions through cement paste are discussed. (C) 1998 Elsevier Science Ltd.

Original languageEnglish
Pages (from-to)1713-1723
Number of pages11
JournalCement and Concrete Research
Volume28
Publication statusPublished - 1998

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