Quantitative characterization of the early hydration of magnesium potassium phosphate cement: In-situ experiment with low field NMR

The in-situ characterization of the rapid early reaction of magnesium potassium phosphate cement (MKPC) via common methods is quite difficult. In this study, the low field nuclear magnetic resonance (LF-NMR) method was used for in-situ monitoring the reaction degree of MgO in MKPC. The comparisons of the results with the reaction degree determined by XRD-Rietveld, BSE image analysis and TG analysis methods showed that LF-NMR is a correct and effective method for the rapid and accurate characterization of the reaction kinetics of MKPC. The insitu kinetic data contributed to the simulation of the porosity development of MKPC, and a strong relationship between the calculated porosity and compressive strength was then established, which is expected to be used for further performance prediction.

Automated summary

The in-situ characterization of the rapid early reaction of magnesium potassium phosphate cement (MKPC) via common methods is difficult. This study utilized low field nuclear magnetic resonance (LF-NMR) for in-situ monitoring the reaction degree of MgO in MKPC. Compared with XRD-Rietveld, BSE image analysis, and TG analysis methods, LF-NMR proved to be a correct and effective method for the rapid and accurate characterization of the reaction kinetics of MKPC. The obtained insitu kinetic data contributed to the simulation of MKPC's porosity development and established a strong relationship between calculated porosity and compressive strength, which can be used for further performance prediction.