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Effect of TiO_2 content on the burnability of clinker with high C_3S were investigated by determination of free lime in final product,and the clinker phase formation,microstructural features of C_3S and the solubility of TiO_2 in C_3S were further studied by XRD,SEM/EDS analysis.TiO_2 ac-celerates the combination of free lime in the samples,free lime content decreases obviously with TiO_2 increasing up to 2% and almost remains above 2%.A new phase CaO·TiO_2 was found when TiO_2 was rnup to 3%,and samples with TiO_2 displayed well-formed uniform size hexagonal C_3S crystal.The limit of solubility of TiO_2 in C_3S at 1400℃ is about 1.7%.