Determination of Calcium Ions in Hydrated Cement Paste at Early Stage
A novel method that allows determining instantaneous concentration of calcium ions, Ca2+, in hydrated cement paste (HCP) is suggested. EDTA solution (belonging to a group of carboxylic acids/carboxylates and borates) seems to be very effective retarder altering nucleation and subsequent growth of newly forming clusters of calcium minerals. Concentrations of Ca2+ have been determined for various water to cement ratios, at different times and for given temperature.
Luís Guerra ROSA and Fernanda MARGARIDO
Š. Hošková et al., "Determination of Calcium Ions in Hydrated Cement Paste at Early Stage", Materials Science Forum, Vols. 636-637, pp. 1239-1243, 2010