Carbonation of γ-Ca2SiO4 and the Mechanism of Vaterite Formation
Source abstract
Abstract
The carbonation of γ-Ca2SiO4 (γ-C2S) and mechanism of vaterite formation have been investigated by evaluating the crystal structures of both γ-C2S and vaterite. The samples used were autoclaved calcium silicate hydrate hardening bodies prepared from Ordinary Portland Cement (OPC), γ-C2S and α-quartz and then subjected to accelerated carbonation. The ratio of OPC to γ-C2S was varied. Ca2+ in both γ-C2S and vaterite was found to be coordinated to six O2-. In addition, both γ-C2S and vaterite have similar atomic arrangements of O2- and Ca2+ and Ca-O bond distances. Therefore, it is proposed that vaterite mainly forms from γ-C2S via a topotactic reaction during accelerated carbonation.
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Research context
OpenAlex topics: Concrete and Cement Materials Research · CO2 Sequestration and Geologic Interactions · Calcium Carbonate Crystallization and Inhibition
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of International Development Engineering, Tokyo Institute of Technology, Japan.
Department of Metallurgy and Ceramic Science, Tokyo Institute of Technology, Japan.
Denki Kagaku Kogyo Corporation, Japan.
References (19)
Show source-provided references
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