Solution chemistry of cubic and orthorhombic tricalcium aluminate hydration

Rupert J. Myers, Guoqing Geng, Jiaqi Li, Erich D. Rodriguez, Priscila da Rosa, Ana P. Kirchheim, Paulo J. M. Monteiro

Research output: Contribution to journalArticlepeer-review

Abstract

This paper presents a solution chemistry-focused analysis of orthorhombic and cubic tricalcium aluminate (orth-C3A and cub-C3A, respectively) hydration. It is shown that the different solubilities of cub- and orth-C3A influence the bulk aqueous Ca to Al concentration ratio and the C3A/solution interface chemistry. The results are consistent with the bulk solution chemistry controlling orth-C3A dissolution, and with cub-C3A dissolution controlled by the formation of an Al-rich leached layer and adsorption of Ca‑sulfur ion pair complexes onto this layer. The polynaphthalene sulfonate-based admixture used here is identified to modify the solution chemistry and retard cub-C3A dissolution. Strategies to inhibit C3A dissolution in Portland cement are discussed.
Original languageEnglish
Pages (from-to)176-185
JournalCement and Concrete Research
Volume100
Early online date18 Jul 2017
DOIs
Publication statusPublished - Oct 2017

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