Fig. 3 shows the TG curves of the pure cement sample and the
10% w/w P25 blended cement samples that had been hydrated
for 3, 7 and 28 days.
The content of the non-evaporable water
bound in the cement pastes was determined as the weight loss between
120 C and 900 C on the TG curves.
The non-evaporable water value for the samples incorporating 10% P25 was normalized
with the mass fraction (0.909) of cement in the pastes, considering
TiO2 was a non-hydraulic additive.
As shown in Fig. 4, the nonevaporable
water content increased with hydration age.
Dosing nano-TiO2 powders into the cement pastes significantly enhanced
the amount of chemically bound water, especially at the early curing
ages, indicating that the hydration reactions were accelerated.