RT Journal Article
T1 Belite hydration at high temperature and pressure by in situ synchrotron powder diffraction
A1 Morales-Cantero, Alejandro
A1 Gómez-de-la-Torre, María de los  Ángeles
A1 Cuesta-García, Ana María
A1 Fraga-López, Edmundo
A1 Shirani, Shiva
A1 García-Aranda, Miguel Ángel
K1 Cemento
K1 Difracción
AB Portland cements are currently used as Oil‐Well‐Cements for the sheath between the metal casingand the borehole. At high pressures and temperatures, the resulting C-S-H gel(s) is partly unstableand it can react to give different crystalline phases and changing microstructure which increasesporosity. It is known that the addition of silica-rich materials to Portland cements, used to decreasethe overall Ca/Si molar ratio, avoids/minimises the early strength retrogression experienced by neatcement slurries. Alternatively, belite-rich cement could be used but belite reactivity in theseconditions is largely unexplored. Here, belite-rich mixtures have been quantitatively studied at 180bars and of 160 ºC by in situ synchrotron powder diffraction using a tailored-designed spinningcapillary cell. For model alite/belite mixtures, alite strongly accelerates belite hydration in theseconditions. 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 mixturehydrates yielding significant amounts of Jaffeite and a-C2SH and the 20wt%C3S mixture gave noJaffeite and much lower amount of a-C2SH. Finally, a belite cement has also been hydrated in theseconditions and the reaction degree of belite was 50% at 10 h. The hydration of this cement did notyield Jaffeite neither a-C2SH in the studied experimental conditions.
YR 2020
FD 2020-10-16
LK https://hdl.handle.net/10630/19999
UL https://hdl.handle.net/10630/19999
LA eng
NO This 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.
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 25 ene 2026