Minerals in cement chemistry: a single-crystal neutron diffraction and Raman spectroscopic study of thaumasite

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dc.contributor.authorGatta, GDen_AU
dc.contributor.authorMcIntyre, GJen_AU
dc.contributor.authorSwanson, JGen_AU
dc.contributor.authorJacobsen, SDen_AU
dc.date.accessioned2021-12-20T21:00:09Zen_AU
dc.date.available2021-12-20T21:00:09Zen_AU
dc.date.issued2015-04-02en_AU
dc.date.statistics2021-12-13en_AU
dc.description.abstractThaumasite, 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 ν1 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 (ν2) and asymmetric stretching mode (ν3) 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 (ν2) of the sulfate group, and we observe a possible asymmetric stretching mode (ν3) 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. © 2015 by Walter de Gruyter Berlin/Bostonen_AU
dc.identifier.citationGatta, G. D., McIntyre, G. J., Swanson, J. G., & Jacobsen, S. D. (2012). Minerals in cement chemistry: a single-crystal neutron diffraction and Raman spectroscopic study of thaumasite. American Mineralogist, (97)7, 1060-1069. doi:10.2138/am.2012.4058en_AU
dc.identifier.issn0003-004Xen_AU
dc.identifier.issue7en_AU
dc.identifier.journaltitleAmerican Mineralogisten_AU
dc.identifier.pagination1060-1069en_AU
dc.identifier.urihttps://doi.org/10.2138/am.2012.4058en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12582en_AU
dc.identifier.volume97en_AU
dc.language.isoenen_AU
dc.publisherDe Gruyteren_AU
dc.subjectPortland cementen_AU
dc.subjectMonocrystalsen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectRaman spectroscopyen_AU
dc.subjectHydrogenen_AU
dc.subjectGround wateren_AU
dc.titleMinerals in cement chemistry: a single-crystal neutron diffraction and Raman spectroscopic study of thaumasiteen_AU
dc.typeJournal Articleen_AU
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