Ettringite, reported with ideal formula Ca6Al2(SO4)3(OH)12·26H2O, is recognized as a secondary-alteration mineral and as an important crystalline constituent of Portland cements, playing different roles at different time scales. It contains more than 40 wt% of H2O. The crystal structure and crystal chemistry of ettringite were investigated by electron microprobe analysis in wavelength-dispersive mode, infrared spectroscopy, and single-crystal neutron diffraction at 20 K. The anisotropic neutron structure refinement allowed the location of (22+2) independent H sites, the description of their anisotropic vibrational regime and the complex hydrogen-bonding schemes. Analysis of the difference-Fourier maps of the nuclear density showed a disordered distribution of the inter-column ("free") H2O molecules of the ettringite structure, modeled (in the structure refinement) with two independent and mutually exclusive configurations. As the disorder is still preserved down to 20 K, we are inclined to consider that as a "static disorder." The structure of ettringite is largely held together by hydrogen bonding: The building units [i.e., SO4 tetrahedra, Al(OH)6 octahedra, and Ca(OH)4(H2O)4 polyhedra] are interconnected through an extensive network of hydrogen bonds. The ettringite of this study has ideal composition Ca6Al2(SO4)3(OH)12·27H2O, with (Mn+Fe+Si+Ti+Na+Ba) < 0.04 atoms per formula unit. The effect of the low-temperature stability of ettringite and thaumasite on the pronounced "Sulfate Attack" of Portland cements, observed in cold regions, is discussed.

Minerals in cement chemistry. A single-crystal neutron diffraction study of ettringite, Ca6Al2(SO4)3(OH)12·27H2O / Gatta, G. Diego; Hålenius, Ulf; Bosi, Ferdinando; Cañadillas-Delgado, Laura; Fernandez-Diaz, Maria Teresa. - In: AMERICAN MINERALOGIST. - ISSN 0003-004X. - 104:1(2019), pp. 73-78. [10.2138/am-2019-6783]

Minerals in cement chemistry. A single-crystal neutron diffraction study of ettringite, Ca6Al2(SO4)3(OH)12·27H2O

Bosi, Ferdinando;
2019

Abstract

Ettringite, reported with ideal formula Ca6Al2(SO4)3(OH)12·26H2O, is recognized as a secondary-alteration mineral and as an important crystalline constituent of Portland cements, playing different roles at different time scales. It contains more than 40 wt% of H2O. The crystal structure and crystal chemistry of ettringite were investigated by electron microprobe analysis in wavelength-dispersive mode, infrared spectroscopy, and single-crystal neutron diffraction at 20 K. The anisotropic neutron structure refinement allowed the location of (22+2) independent H sites, the description of their anisotropic vibrational regime and the complex hydrogen-bonding schemes. Analysis of the difference-Fourier maps of the nuclear density showed a disordered distribution of the inter-column ("free") H2O molecules of the ettringite structure, modeled (in the structure refinement) with two independent and mutually exclusive configurations. As the disorder is still preserved down to 20 K, we are inclined to consider that as a "static disorder." The structure of ettringite is largely held together by hydrogen bonding: The building units [i.e., SO4 tetrahedra, Al(OH)6 octahedra, and Ca(OH)4(H2O)4 polyhedra] are interconnected through an extensive network of hydrogen bonds. The ettringite of this study has ideal composition Ca6Al2(SO4)3(OH)12·27H2O, with (Mn+Fe+Si+Ti+Na+Ba) < 0.04 atoms per formula unit. The effect of the low-temperature stability of ettringite and thaumasite on the pronounced "Sulfate Attack" of Portland cements, observed in cold regions, is discussed.
File allegati a questo prodotto
File Dimensione Formato  
Gatta_Minerals_2019.pdf

solo gestori archivio

Note: articolo principale
Tipologia: Versione editoriale (versione pubblicata con il layout dell'editore)
Licenza: Tutti i diritti riservati (All rights reserved)
Dimensione 1.04 MB
Formato Adobe PDF
1.04 MB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11573/1244776
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 8
  • ???jsp.display-item.citation.isi??? 7
social impact