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A platform for research: civil engineering, architecture and urbanism
In-situ early-age hydration study of sulfobelite cements by synchrotron powder diffraction
Abstract Eco-friendly belite calcium sulfoaluminate (BCSA) cement hydration behavior is not yet well understood. Here, we report an in-situ synchrotron X-ray powder diffraction study for the first hours of hydration of BCSA cements. Rietveld quantitative phase analysis has been used to establish the degree of reaction (α). The hydration of a mixture of ye'elimite and gypsum revealed that ettringite formation (α ~70% at 50h) is limited by ye'elimite dissolution. Two laboratory-prepared BCSA cements were also studied: non-active-BCSA and active-BCSA cements, with β- and α′H-belite as main phases, respectively. Ye'elimite, in the non-active-BCSA system, dissolves at higher pace (α ~25% at 1h) than in the active-BCSA one (α ~10% at 1h), with differences in the crystallization of ettringite (α ~30% and α ~5%, respectively). This behavior has strongly affected subsequent belite and ferrite reactivities, yielding stratlingite and other layered phases in non-active-BCSA. The dissolution and crystallization processes are reported and discussed in detail.
Highlights Belite calcium sulfoaluminate cements early hydration mechanism has been determined. Belite hydration strongly depends on availability of aluminum hydroxide. Orthorhombic ye’elimite dissolved at a higher pace than cubic one. Ye’elimite larger reaction degree yields stratlingite formation by belite reaction. Rietveld method quantified gypsum, anhydrite and bassanite dissolution rates.
In-situ early-age hydration study of sulfobelite cements by synchrotron powder diffraction
Abstract Eco-friendly belite calcium sulfoaluminate (BCSA) cement hydration behavior is not yet well understood. Here, we report an in-situ synchrotron X-ray powder diffraction study for the first hours of hydration of BCSA cements. Rietveld quantitative phase analysis has been used to establish the degree of reaction (α). The hydration of a mixture of ye'elimite and gypsum revealed that ettringite formation (α ~70% at 50h) is limited by ye'elimite dissolution. Two laboratory-prepared BCSA cements were also studied: non-active-BCSA and active-BCSA cements, with β- and α′H-belite as main phases, respectively. Ye'elimite, in the non-active-BCSA system, dissolves at higher pace (α ~25% at 1h) than in the active-BCSA one (α ~10% at 1h), with differences in the crystallization of ettringite (α ~30% and α ~5%, respectively). This behavior has strongly affected subsequent belite and ferrite reactivities, yielding stratlingite and other layered phases in non-active-BCSA. The dissolution and crystallization processes are reported and discussed in detail.
Highlights Belite calcium sulfoaluminate cements early hydration mechanism has been determined. Belite hydration strongly depends on availability of aluminum hydroxide. Orthorhombic ye’elimite dissolved at a higher pace than cubic one. Ye’elimite larger reaction degree yields stratlingite formation by belite reaction. Rietveld method quantified gypsum, anhydrite and bassanite dissolution rates.
In-situ early-age hydration study of sulfobelite cements by synchrotron powder diffraction
Álvarez-Pinazo, G. (author) / Cuesta, A. (author) / García-Maté, M. (author) / Santacruz, I. (author) / Losilla, E.R. (author) / Sanfélix, S.G. (author) / Fauth, F. (author) / Aranda, M.A.G. (author) / De la Torre, A.G. (author)
Cement and Concrete Research ; 56 ; 12-19
2013-10-24
8 pages
Article (Journal)
Electronic Resource
English
In-situ early-age hydration study of sulfobelite cements by synchrotron powder diffraction
| British Library Online Contents | 2014
In-situ early-age hydration study of sulfobelite cements by synchrotron powder diffraction
| Online Contents | 2014
| British Library Online Contents | 2010