Surface carbonation of synthetic C-S-H samples: A comparison between fresh and aged C-S-H using X-ray photoelectron spectroscopy
- School of Civil Engineering, University of Leeds, Leeds, LS2 9JT (United Kingdom)
- Forschungszentrum Karlsruhe GmbH, Institut fuer Technische Chemie, Bereich Thermische Abfallbehandlung (ITC-TAB), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen (Germany)
- Materials and Engineering Research Institute, Sheffield Hallam University, Howard Street, Sheffield, S1 1WB (United Kingdom)
This paper presents a continuation of studies into silicate anion structure using X-ray photoelectron spectroscopy (XPS). A series of C-S-H samples have been prepared mechanochemically, and then stored under ambient conditions for six months. Storage led to surface carbonation, the extent of which was dependent upon the calcium/silicon ratio of the fresh sample. Carbonation arose through decalcification of the C-S-H, leading to increased silicate polymerisation. The surfaces of the most calcium-rich phases (C/S = 1.33 and 1.50) underwent complete decalcification to yield silica (possibly containing some silanol groups) and calcium carbonate. Carbonation, and hence changes in silicate anion structure, was minimal for the C-S-H phases with C/S = 0.67 and 0.75.
- OSTI ID:
- 21130724
- Journal Information:
- Cement and Concrete Research, Vol. 38, Issue 6; Other Information: DOI: 10.1016/j.cemconres.2008.02.003; PII: S0008-8846(08)00043-4; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0008-8846
- Country of Publication:
- United States
- Language:
- English
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