Sulfate attack and the accompanying crystallization of fibrous ettringite [Ca6Al2(OH)12(SO4)326H2O] cause cracking and loss of strength in concrete structures. Hard synchrotron X-ray microdiffraction is used to quantify the orientation distribution of ettringite crystals. Diffraction images are analyzed using the Rietveld method to obtain information on textures. The analysis reveals that the c axes of the trigonal crystallites are preferentially oriented perpendicular to the fracture surfaces. By averaging single-crystal elastic properties over the orientation distribution, it is possible to estimate the elastic anisotropy of ettringite aggregates.

Preferred orientation of ettringite in concrete fractures / H. R., Wenk; P. J. M., Monteiro; M., Kunz; K., Chen; N., Tamura; Lutterotti, Luca; J., Del Arroz. - In: JOURNAL OF APPLIED CRYSTALLOGRAPHY. - ISSN 0021-8898. - STAMPA. - 42:(2009), pp. 429-432. [10.1107/S0021889809015349]

Preferred orientation of ettringite in concrete fractures

Lutterotti, Luca;
2009-01-01

Abstract

Sulfate attack and the accompanying crystallization of fibrous ettringite [Ca6Al2(OH)12(SO4)326H2O] cause cracking and loss of strength in concrete structures. Hard synchrotron X-ray microdiffraction is used to quantify the orientation distribution of ettringite crystals. Diffraction images are analyzed using the Rietveld method to obtain information on textures. The analysis reveals that the c axes of the trigonal crystallites are preferentially oriented perpendicular to the fracture surfaces. By averaging single-crystal elastic properties over the orientation distribution, it is possible to estimate the elastic anisotropy of ettringite aggregates.
2009
H. R., Wenk; P. J. M., Monteiro; M., Kunz; K., Chen; N., Tamura; Lutterotti, Luca; J., Del Arroz
Preferred orientation of ettringite in concrete fractures / H. R., Wenk; P. J. M., Monteiro; M., Kunz; K., Chen; N., Tamura; Lutterotti, Luca; J., Del Arroz. - In: JOURNAL OF APPLIED CRYSTALLOGRAPHY. - ISSN 0021-8898. - STAMPA. - 42:(2009), pp. 429-432. [10.1107/S0021889809015349]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/90985
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