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    •   RIUMA Principal
    • Investigación
    • Química Inorgánica, Cristalografía y Mineralografía - (QICM)
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    •   RIUMA Principal
    • Investigación
    • Química Inorgánica, Cristalografía y Mineralografía - (QICM)
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    Belite hydration at high temperature and pressure by in situ synchrotron powder diffraction

    • Autor
      Morales-Cantero, Alejandro; Gomez-de-la-Torre, Maria de los AngelesAutoridad Universidad de Málaga; Cuesta-Garcia, Ana Maria; Fraga-López, Edmundo; Shirani, Shiva; [et al.]
    • Fecha
      2020-10-16
    • Palabras clave
      Cemento; Difracción
    • Resumen
      Portland cements are currently used as Oil‐Well‐Cements for the sheath between the metal casing and the borehole. At high pressures and temperatures, the resulting C-S-H gel(s) is partly unstable and it can react to give different crystalline phases and changing microstructure which increases porosity. It is known that the addition of silica-rich materials to Portland cements, used to decrease the overall Ca/Si molar ratio, avoids/minimises the early strength retrogression experienced by neat cement slurries. Alternatively, belite-rich cement could be used but belite reactivity in these conditions is largely unexplored. Here, belite-rich mixtures have been quantitatively studied at 180 bars and of 160 ºC by in situ synchrotron powder diffraction using a tailored-designed spinning capillary cell. For model alite/belite mixtures, alite strongly accelerates belite hydration in these conditions. At 10 h of hydration, a-C2S shows a reaction degree of 30 and 80% for 20wt%C3S- 80wt%C2S and 50wt%C3S-50wt%C2S mixtures, respectively. Furthermore, the 50wt%C3S mixture hydrates yielding significant amounts of Jaffeite and a-C2SH and the 20wt%C3S mixture gave no Jaffeite and much lower amount of a-C2SH. Finally, a belite cement has also been hydrated in these conditions and the reaction degree of belite was 50% at 10 h. The hydration of this cement did not yield Jaffeite neither a-C2SH in the studied experimental conditions.
    • URI
      https://hdl.handle.net/10630/19999
    • DOI
      https://dx.doi.org/10.1016/j.conbuildmat.2020.120825
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    2020_09_02_RIUMA.pdf (2.193Mb)
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    • QICM - Artículos

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    REPOSITORIO INSTITUCIONAL UNIVERSIDAD DE MÁLAGA
    REPOSITORIO INSTITUCIONAL UNIVERSIDAD DE MÁLAGA
     

     

    REPOSITORIO INSTITUCIONAL UNIVERSIDAD DE MÁLAGA
    REPOSITORIO INSTITUCIONAL UNIVERSIDAD DE MÁLAGA