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    •   RIUMA Principal
    • Investigación
    • Química Inorgánica, Cristalografía y Mineralografía - (QICM)
    • QICM - Contribuciones a congresos científicos
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    •   RIUMA Principal
    • Investigación
    • Química Inorgánica, Cristalografía y Mineralografía - (QICM)
    • QICM - Contribuciones a congresos científicos
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    Pair distribution function studies in cementitious systems

    • Autor
      Cuesta-Garcia, Ana Maria; Zea-Garcia, Jesus D.; Londono-Zuluaga, Diana; Gomez-de-la-Torre, Maria de los AngelesAutoridad Universidad de Málaga; Santacruz-Cruz, Maria Isabel; [et al.]
    • Fecha
      2017-10-24
    • Palabras clave
      Cristalografía
    • Resumen
      The analysis of amorphous/nanocrystalline phase(s) within cement matrices that contain high amounts of crystalline phase(s) is very challenging. Synchrotron techniques can be very useful to characterize such complex samples.1 This work is focused on total scattering Pair Distribution Function (PDF) quantitative phase analyses in selected real-space ranges for a better understanding of the binding gel(s). Powder diffraction data collected in BL04-MSPD beamline have been analyzed by PDF and Rietveld methodologies to determine nanocrystalline and microcrystalline phase contents. The comparison between both methodologies allows us to have a better insight about the nanocrystalline/microcrystalline components which coexist in cement pastes. Three sets of hydrated model samples have been studied: i) monocalcium aluminate, CaAl2O4, the main component of calcium aluminate cements, ii) ye’elimite, Ca4Al6SO16, the main component of calcium sulfoaluminate cements, and iii) tricalcium silicate, Ca3SiO5, the main component of Portland cements. For the CaAl2O4 paste, the PDF fit shows that the aluminum hydroxide gel has a gibbsite local structure with an average particle size close to 5 nm.2 Figure 1 shows the final fit for CaAl2O4 paste in two different real-space regions. On the contrary, for Ca4Al6SO16 paste, it has been found that the particle size of the aluminum hydroxide gel is below 3 nm. Moreover, the Ca3SiO5 paste contains a different nanocrystalline gel, C-S-H, which has also been thoroughly studied. Different crystal structures (including Tobermorite, Clinotobermorite and Jennite) have been tested to find the structural model that fits better the experimental data. The results from this ongoing investigation will be reported and discussed.
    • URI
      http://hdl.handle.net/10630/14692
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    Ficheros
    2017_05_18_abstract_PDF_cement_AUSE_ALBA-meeting-vf.pdf (490.1Kb)
    Colecciones
    • QICM - Contribuciones a congresos científicos

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    REPOSITORIO INSTITUCIONAL UNIVERSIDAD DE MÁLAGA
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    REPOSITORIO INSTITUCIONAL UNIVERSIDAD DE MÁLAGA
    REPOSITORIO INSTITUCIONAL UNIVERSIDAD DE MÁLAGA