The heat evolution curves describing the rate of heat evolution
for the cement/TiO2 mixtures with 0%, 5% and 10% addition of
nano-TiO2 are presented in Fig. 1.
Because the mixtures were prepared
outside the calorimeter, the first heat evolution peak resulted
from the fast hydration of tricalcium aluminate (C3A)
could not be recorded.
As shown in the figures, the main peak occurred
earlier for all the samples containing TiO2 in comparison
with the reference sample.
The addition of the fine TiO2 powders
significantly increased the intensity of the heat peak and shortened
its duration of occurrence.