Belite hydration at high temperature and pressure by in situ synchrotron powder diffraction

Belite cements and their activation

“…Finally, it is highlighted that the in-situ hydration study of a class-G HSR Oil Well Cement with synchrotron radiation has recently reported a 43% hydration degree of β-C2S at 14 h at 150 ºC and 150 bars [126]. A similar study for a BC at 155ºC and 180 bars showed a degree of reaction of belite of 62% at 14 hours [127]. These studies are not of direct relevance for industrial BCs at room temperatures and pressures but it highlights that there is room for improving belite reactivity.…”

Influence of curing temperature on belite cement hydration: A comparative study with Portland cement

“…MAS-NMR. 29 Si MAS-NMR (Magic Angle Spinning Nuclear Magnetic Resonance) spectra for selected pastes were recorded at RT on a Bruker AVIII HD 600 NMR spectrometer (field strength of 14.1 T) at 156.4 MHz. The chemical shift was referenced to an external solution of tetramethylsilane.…”

“…Finally, average densities were 3.13 and 3.17 g.cm -3 for PC and BC, respectively. The belite cement was employed in a previous study under oil well curing conditions and its textural properties were reported [29] but they are also given here for easy access to the information.…”

“…29 Si MAS-NMR study. The BC and PC pastes hydrated at 28 days and at 20ºC and 60ºC were also studied by 29 Si MAS-NMR. Fig.…”

Effect of Fly Ash Belite Cement on Hydration Performance of Portland Cement

“…This "superposition effect" can efficiently promote hydrothermal synthesis reaction of active components and lime, accelerate the hydrothermal synthesis rate, and improve the specific surface area, reactivity as well as the total content of cementitious minerals. To date, most research works [15][16][17] have focused on improving the hydrothermal synthesis process, while little is known regarding the mineral structure, properties and synergistic hydration mechanism. In this paper, we analyze the synergistic hydration and performance of FABC and Portland cement, and reveal the activity and function of C 2 S and C 12 A 7 synthesized at low temperatures.…”