Minerals in cement chemistry: a single-crystal neutron diffraction and Raman spectroscopic study of thaumasite, Ca3Si(OH)6(CO3)(SO4)o12H2O. (Articolo in rivista)

Type
Label
  • Minerals in cement chemistry: a single-crystal neutron diffraction and Raman spectroscopic study of thaumasite, Ca3Si(OH)6(CO3)(SO4)o12H2O. (Articolo in rivista) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.2138/am.2012.4058 (literal)
Alternative label
  • G. DieGo Gatta, Garry J. Mcintyre, Julia G. SwanSon, anD Steven D. JacobSen (2012)
    Minerals in cement chemistry: a single-crystal neutron diffraction and Raman spectroscopic study of thaumasite, Ca3Si(OH)6(CO3)(SO4)o12H2O.
    in The American mineralogist
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • G. DieGo Gatta, Garry J. Mcintyre, Julia G. SwanSon, anD Steven D. JacobSen (literal)
Pagina inizio
  • 1060 (literal)
Pagina fine
  • 1069 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://dx.doi.org/10.2138/am.2012.4058 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 97 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 10 (literal)
Note
  • ISI Web of Science (WOS) (literal)
  • Scopus (literal)
  • Google Scholar (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Dipartimento di Scienze della Terra, Universita' degli Studi di Milano, Via Botticelli 23, I-20133 Milano, Italy CNR-Istituto per la Dinamica dei Processi Ambientali, Milano, Italy The Bragg Institute, Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, New South Wales 2232, Australia Department of Earth and Planetary Sciences, Northwestern University, Evanston, Illinois 60208, U.S.A. (literal)
Titolo
  • Minerals in cement chemistry: a single-crystal neutron diffraction and Raman spectroscopic study of thaumasite, Ca3Si(OH)6(CO3)(SO4)o12H2O. (literal)
Abstract
  • Thaumasite, Ca3Si(OH)6 (CO3 )(SO4 )?12H2O, is recognized as a secondary-alteration mineral and indicator of sulfate attack in Portland cement in contact with sulfate-rich groundwater, especially in cold regions. The hydrogen positions in thaumasite have been determined from single-crystal neutron diffraction structure refinements at 300 and 22 K. No phase transitions occur within the temperature range investigated. The structure of thaumasite is largely held together by hydrogen bonding. The major structural units [CO3 groups, SO4 tetrahedra, Si(OH)6 octahedra, and Ca(OH)4 (H2O)4 polyhedra] are interconnected via 10 distinct hydrogen bonds. Analysis of the difference-Fourier maps of the nuclear density reveals the positions of all 10 hydrogen atoms in the structure, and the hydrogen bonding becomes shorter (stronger) upon decreasing temperature to 22 K. The SO4 tetrahedron expands upon decreasing temperature (i.e., negative thermal expansion at the molecular level), driven by shortening of the hydrogen bonding between [Ca3Si(OH)6 (H2O)12 ] 4+ columns. Polarized Raman spectra of thaumasite show that the ?1 symmetric stretching modes of Si(OH)6 , SO4 , and CO3 occur at 658, 983, and 1066 cm-1 , respectively. In addition, the out-of-plane bending mode (?2 ) and asymmetric stretching mode (?3 ) of the carbonate group are tentatively assigned to bands at 887 and 1400 cm-1 , respectively. Bands at 418 and 455 cm-1 (and possibly at 477 cm-1 ) are attributed to the symmetric bending modes (?2 ) of the sulfate group, and we observe a possible asymmetric stretching mode (?3 ) of SO4 at 1090-1100 cm-1 . Splitting of some sulfate and carbonate vibrational modes may occur due to hydrogen bonding on all the oxygen sites. At 1685-1710 cm-1 we observe the H2O bending modes (H-O-H), and from 2900-3600 cm-1 there are 13 distinct bands associated with bending overtones and the O-H stretching vibrations corresponding to H-positions determined in the neutron diffraction study. The effect of the low-temperature stability of thaumasite on the pronounced \"thaumasite sulfate attack\" of Portland cements observed in cold regions is discussed. (literal)
Prodotto di
Autore CNR

Incoming links:


Prodotto
Autore CNR di
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi
data.CNR.it