Abstract
The effect of barium carbonate on the kinetics of tricalcium silicate formation has been studied. Burnability study of mixes of calcium carbonate and quartz in 3:1 ratio and barium carbonate equivalent to 0.5 to 4% BaO by weight showed accelerated rate of clinkerisation through mineralising action. The addition of BaCO 3 significantly reduced the time and temperature of formation of C 3S. At 1450°C up to 1.85% BaO could be assimilated in forming solid solution of C 3S. With up to 2% BaO triclinic form and 4% BaO, monoclinic form of C 3S was stabilised. The solubility of BaO in C 3S at 1450°C was investigated using chemical analysis (estimation of free lime) and energy dispersive analysis of X-rays. The limit of solubility is found to be 1.85% (by weight) at 1450°C. Above the solubility limit, BaO formed Ba 3SiO 5 at 1450°C.
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