Study of the system CaOSiO2CO2H2O in relation to scawtite under hydrothermal conditions

Autor:	F. Hanic, I. Kaprálik, L. Števula, J. Petrovič
Rok vydání:	1984
Předmět:	Calcite Materials science Xonotlite Carbonation Mineralogy Tobermorite Building and Construction Hydrothermal circulation chemistry.chemical_compound CO2 content chemistry Chemical engineering Carbon dioxide Calcium silicate General Materials Science
Zdroj:	Cement and Concrete Research. 14:866-872
ISSN:	0008-8846
DOI:	10.1016/0008-8846(84)90013-9
Popis:	Hydrothermal studies showed the location of scawtite in the narrow internal tetrahedronfoshagite-xonotlite-CO2H2O of the system CaOSiO2CO2H2O and its compatibility with the calcium silicate hydrates in the 4-phase assemlages. The phase assemblages in this region involve scawtite, foshagite, xonotlite, tobermorite, hillebrandite, calcite and silica. The carbonation series of the 4-phase assemblages were determined in the sections C4S3CO2H2O (C4S3 = 4CaO · 3SiO2), C7S6CO2H2O and C6S6CO2H2O at 473 K and saturated steam pressure in dependence on the CO2 content. The carbonating influence of CO2 takes place in the volume of the CaOSiO2CO2H2O system up to the CO2 concentration limited by the calcite-silica-H2O triangle. Above this CO2 content, carbon dioxide appears in a gaseous form together with gaseous H2O in the 4-phase assemblage calcite-silica-CO2H2O. The instability of scawtite under the CO2 excess (CO2/C7S6 > 1) is influenced by its structural arrangement. The present channels enable penetration of CO2 molecules into the structure and formation of carbonated phases.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f9be947f16d3e6da3b8c48f783325c79 https://doi.org/10.1016/0008-8846(84)90013-9 Zobrazit plný text záznamu