Investigation on early hydration features of magnesium potassium phosphate cementitious material with the electrodeless resistivity method

An electrodeless resistivity method is applied to trace the early hydration behavior of magnesium potassium phosphate cement (MKPC). The relationship between setting times (including initial and final setting time) and the characteristic points of the electrodeless resistance is studied, aiming to establish a rapid testing method which could predict the setting time of MKPC. Moreover, a linear relationship between the standard compressive strength at 28 days and the resistivity at 24 h of MKPC is also established, and demonstrates that the resistivity and the standard compressive strength have a compact corresponding relationship. Therefore, the standard compressive strength of magnesium potassium phosphate cement could be predicted by electrodeless resistivity parameters.