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Hydration and carbonation of monoclinic C 2 S and C 3 S studied by Raman spectroscopy
Author(s) -
Ibáñez Jordi,
Artús Lluís,
Cuscó Ramon,
López Ángel,
Menéndez Esperanza,
Andrade María C.
Publication year - 2007
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1599
Subject(s) - carbonation , raman spectroscopy , monoclinic crystal system , aragonite , calcite , silicate , crystallinity , mineralogy , vaterite , materials science , calcium silicate , chemistry , analytical chemistry (journal) , chemical engineering , crystallography , composite material , crystal structure , optics , environmental chemistry , organic chemistry , physics , engineering
We present a micro‐Raman study on the hydration and carbonation of the main silicate phases of Portland cement, i.e. monoclinic dicalcium silicate (C 2 S) and monoclinic tricalcium silicate (C 3 S). We investigate the reaction products and the loss of crystallinity induced by hydration on these two compounds. In the CO 2 ‐contaminated pastes we find that calcite, aragonite, and vaterite are inhomogeneously formed. We study sample cross sections to evaluate the maximum depth at which CaCO 3 is formed. We find that carbonation is limited to the first 500–1000 µm from the surface in the C 3 S pastes, while in C 2 S pastes CaCO 3 is formed well beyond this depth. Our results show the great potential of Raman spectroscopy in the study of the chemistry of cements. Copyright © 2006 John Wiley & Sons, Ltd.
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