Influence of fly ash and metakaolin on the microstructure and compressive strength of magnesium potassium phosphate cement paste

Effect of water content on microstructure and properties of magnesium potassium phosphate cement pastes with different magnesia‐to‐phosphate ratios

“…A diffuse scattering was identified in the patterns of M1.5 W0.14 and M1.5 W0.16 between 25° < 2θ ≤ 35° (Figure 6A), which may be associated with the X-ray amorphous phase. 23,29,30 The formation of the noncrystalline phase seems to justify the depletion of KH 2 PO 4 in these water-deficient samples and previously reported systems 13,14,31 where K-struvite was the only crystalline product detected. Further confirmation to such a tentative explanation comes from FTIR analysis and SEM/BSE observations.…”

Preparation and characterization of ferrous oxalate cement—A novel acid‐base cement

“…One effective way to reduce the cost and to green (lower the energy consumption and carbon emission associated with) MPCs could be to use industrial by-products and solid wastes as alternative precursors and/or supplementary materials in the preparation of MPCs. Guided by this strategy, low-grade MgO by-product, 23,24 asbestos-containing wastes, 25 and boron-containing MgO (a by-product of Li 2 CO 3 production) 26 have been used as alternative MgO source; (low-grade) fly ash, 27,28 steel slag, 29 and metakaolin 30 have been widely adopted as supplementary components in MPCs.…”

Influence of metakaolin on the conversion and compressive strength of quaternary phase paste

“…45 For example, they were used to study the complex conversion reactions of hydration phases in the MK/Ca(OH) 2 system, and to characterize the dissolution of glassy aluminosilicate phases of GGBS, fly ash, and MK. 46,47 In this study, 27 Al and 29 Si NMR spectra were acquired by a Bruker AVANCE III 400 spectrometer. 27 Al NMR spectra were recorded using a spinning speed of 10 kHz, a relaxation delay of 2 s, and a total of 1024 scans.…”

“…27 Al and 29 Si NMR have been proved to be useful for analyzing the atomic coordination and polyhedral polymerization in crystalline and amorphous materials 45 . For example, they were used to study the complex conversion reactions of hydration phases in the MK/Ca(OH) 2 system, and to characterize the dissolution of glassy aluminosilicate phases of GGBS, fly ash, and MK 46,47 . In this study, 27 Al and 29 Si NMR spectra were acquired by a Bruker AVANCE III 400 spectrometer.…”