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dc.contributor.authorMorales-Cantero, Alejandro
dc.contributor.authorGómez-de-la-Torre, María de los Ángeles 
dc.contributor.authorCuesta-García, Ana María
dc.contributor.authorFraga-López, Edmundo
dc.contributor.authorShirani, Shiva
dc.contributor.authorGarcía-Aranda, Miguel Ángel 
dc.date.accessioned2020-10-16T06:59:16Z
dc.date.available2020-10-16T06:59:16Z
dc.date.created2020-09
dc.date.issued2020-10-16
dc.identifier.urihttps://hdl.handle.net/10630/19999
dc.description.abstractPortland 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.en_US
dc.description.sponsorshipThis work has been supported by BIA2017-82391-R research grant, which is co-funded by FEDER. We thank ALBA synchrotron for providing beam time at NCD-Sweet beamline and Marc Malfois for his assistance during the experiment. We also thank Buzzi Unicem SpA for providing us with more than 30 kg of a large-scale production belite cement.en_US
dc.language.isoengen_US
dc.relation.ispartofseries262;120825
dc.rightsinfo:eu-repo/semantics/embargoedAccess
dc.subjectCementoen_US
dc.subjectDifracciónen_US
dc.subject.otherOil‐Well‐Cementen_US
dc.subject.otherC-S-H conversionen_US
dc.subject.otherBelite reactivityen_US
dc.subject.otherSynchrotron radiationen_US
dc.subject.otherRietveld methoden_US
dc.subject.otherQuantitative phase analysisen_US
dc.titleBelite hydration at high temperature and pressure by in situ synchrotron powder diffractionen_US
dc.typeinfo:eu-repo/semantics/articleen_US
dc.centroFacultad de Cienciasen_US
dc.identifier.doi10.1016/j.conbuildmat.2020.120825


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