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It has great potential that steel slag powder as the supplementary cementitious materials used in cement and concrete field.Cementitious property of steel slag powder and effect of its fineness and incorporation amount on the mechanical property of blended cement were studied.And the microscopic mechanism was also analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetry analysis (TG) and mercury intrusion porosimetry (MIP).