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- W4309553636 abstract "The mechanism of the effect of a Ca-rich environment on the reaction process and the molecular structure of the magnesium oxide (MgO)-activated SiO 2 reaction product are described in this research. In the experimental study, MgO, silica fume, and calcium oxide (CaO) were used as raw materials to prepare a calcium-magnesium coupling excited SiO 2 system with different Ca:Mg molar ratios. The samples were characterized by X-ray diffraction, thermogravimetry/derivative thermogravimetry, inductively coupled plasma mass spectroscopy, transmission electron microscopy, and 29 Si nuclear magnetic resonance. A higher Ca:Mg molar ratio (above 0.179:1) inhibited magnesium silicate hydrate gel formation, while a lower ratio (less than 0.09:1) promoted magnesium silicate hydrate gel formation. The amount of Ca 2+ and Mg 2+ presented in the pore solution in the Ca-rich environment was not sufficient to react with silicate ions (H 2 SiO2− 4 and H 3 SiO− 4) to form gel, leading to surplus SiO 2 . Changes in the Ca 2+ concentration in the pore solution affected Mg 2+ and silicate ions behavior. The hydration of low amounts of CaO provided ionization products of Ca 2+ and OH − ions, MgO and CaO were hydrolyzed, and less ionized OH − was consumed by silicate ions. The hydration and ionization of MgO increased the Mg 2+ concentration, while the silicate ions concentration decreased. However, excess OH − ions produced by hydration and ionization with high amounts of CaO exhibited opposite effects, subsequently impacting the calcium–magnesium coupling excited SiO 2 system. Thermodynamic calculations revealed that the magnesium silicate hydrate gel was more stable than the calcium silicate hydrate gel, and the influence of various Ca-rich environments on the MgO-activated SiO 2 reaction process was further studied." @default.
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- W4309553636 date "2023-02-01" @default.
- W4309553636 modified "2023-10-14" @default.
- W4309553636 title "Effect of a Ca-rich environment on the reaction process of the MgO-activated SiO2 system" @default.
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- W4309553636 doi "https://doi.org/10.1016/j.cemconcomp.2022.104855" @default.
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