Kinetics of hydration of 2CaO·SiO2–xMn2O3 system

Samples of dicalcium silicate using xMn2O3 (x = 0.5–5.0% by mass of C2S) were prepared and hydrated with a view to studying the effect of concentration of Mn2O3 on the kinetics of hydration of pure and Mn2O3 doped phase. Hydrated samples of different age intervals from 3–180 days were investigated by DTA/DTG and X-ray diffraction techniques. Hydration of Mn2O3 doped dicalcium silicate phase indicates that the hydration increases with increase in Mn2O3 from 0.5 to 0.7% and then declines to become minimal at 5.0% Mn2O3 concentration. The degree of hydration and extent of hydration uniformly increase at all concentrations, reaching a value of 69% at 90 days age for pure C2S and 99% at 90 days age for 0.7% Mn2O3 dopant. However, only 86% of hydration is observed for 0.5% Mn2O3 dopant at the above age.