Abstract
The hydration kinetics of titania-bearing tricalcium silicate phase have been studied. TiO 2-doped tricalcium silicate (C 3S) was obtained by repeated firing of calcium carbonate and quartz in the stoichiometric ratio of 3:1 in the presence of varying amounts of titanium dioxide from 0.5 to 6% by weight. The study revealed that the presence of up to 2% TiO 2 has an inhibiting effect on the rate of hydration of C 3S. One percent TiO 2 in C 3S marginally slows down the rate of hydration of tricalcium silicate up to approximately 2 days and then increases sharply to overtake the hydration rate of pure C 3S. Higher percentages of TiO 2 (>2%) in C 3S have a higher hydration rate than C 3S containing up to 2% TiO 2 from 1 h to 28 days. This is achieved by modification of the polymorphic form of C 3S and by the formation of CaOTiO 2 in the CaO-SiO 2-TiO 2 system.
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