Hydration mechanisms of two polymorphs of synthetic ye'elimite

Ye'elimite is the main phase in calcium sulfoaluminate cements and also a key phase in sulfobelite cements. However, its hydration mechanism is not well understood. Here we reported new data on the hydration behavior of ye'elimite using synchrotron and laboratory powder diffraction coupled...

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Bibliographic Details
Published in:Cement and concrete research 2014-09, Vol.63, p.127-136
Main Authors: Cuesta, A., Álvarez-Pinazo, G., Sanfélix, S.G., Peral, I., Aranda, M.A.G., De la Torre, A.G.
Format: Article
Language:English
Subjects:
Applied sciences
ATOMIC FORCE MICROSCOPY
Buildings. Public works
CALCIUM
Calcium sulfoaluminate (D)
Cement concrete constituents
CEMENTS
CRYSTALLIZATION
DIFFRACTION
DISSOLUTION
Dissolution and crystallization kinetics (A)
Exact sciences and technology
HYDRATION
Hydration mechanism (A)
KINETICS
Materials
MATERIALS SCIENCE
Methodology
ORTHORHOMBIC LATTICES
POWDERS
Properties of anhydrous and hydrated cement, test methods
Rietveld method (B)
SOLID SOLUTIONS
Solubility
SULFATES
SYNCHROTRONS
Ye'elimite (D)
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Summary:Ye'elimite is the main phase in calcium sulfoaluminate cements and also a key phase in sulfobelite cements. However, its hydration mechanism is not well understood. Here we reported new data on the hydration behavior of ye'elimite using synchrotron and laboratory powder diffraction coupled to the Rietveld methodology. Both internal and external standard methodologies have been used to determine the overall amorphous contents. We have addressed the standard variables: water-to-ye'elimite ratio and additional sulfate sources of different solubilities. Moreover, we report a deep study of the role of the polymorphism of pure ye'elimites. The hydration behavior of orthorhombic stoichiometric and pseudo-cubic solid-solution ye'elimites is discussed. In the absence of additional sulfate sources, stoichiometric-ye'elimite reacts slower than solid-solution-ye'elimite, and AFm-type phases are the main hydrated crystalline phases, as expected. Moreover, solid-solution-ye'elimite produces higher amounts of ettringite than stoichiometric-ye'elimite. However, in the presence of additional sulfates, stoichiometric-ye'elimite reacts faster than solid-solution-ye'elimite.
ISSN:0008-8846
1873-3948
DOI:10.1016/j.cemconres.2014.05.010