Impact of water vapour and carbon dioxide on surface composition of C sub(3)A polymorphs studied by X-ray photoelectron spectroscopy

The surface specific analytical method, X-ray photoelectron spectroscopy (XPS), has been used to study the effects of water vapour and CO sub(2) on the cubic and orthorhombic polymorphs of C sub(3)A. Significant differences between the two polymorphs were observed in the XPS spectra. Upon exposure t...

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Bibliographic Details
Published inCement and concrete research Vol. 73; pp. 36 - 41
Main Authors Dubina, E, Plank, J, Black, L
Format Journal Article
LanguageEnglish
Published 01.07.2015
Subjects
Carbon dioxide
Carbonation
Photoelectron spectroscopy
Spectra
Tricalcium aluminum ferrite
Vapour
X-ray photoelectron spectroscopy
X-rays
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Summary:The surface specific analytical method, X-ray photoelectron spectroscopy (XPS), has been used to study the effects of water vapour and CO sub(2) on the cubic and orthorhombic polymorphs of C sub(3)A. Significant differences between the two polymorphs were observed in the XPS spectra. Upon exposure to water vapour, both polymorphs produced C sub(4)AH sub(13) on their surfaces. Additionally, the sodium-doped o-C sub(3)A developed NaOH and traces of C sub(3)AH sub(6) on its surface. Subsequent carbonation yielded mono carboaluminate on both polymorphs. Large amounts of Na sub(2)CO sub(3) also formed on the surface of o-C sub(3)A as a result of carbonation of NaOH. Furthermore, the extent of carbonation was much more pronounced for o-C sub(3)A sub(o) than for c-C sub(3)A.
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ISSN:0008-8846
DOI:10.1016/j.cemconres.2015.02.026