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The microbead modified super sulfate cement (SSC) was employed to prepare C60~C80 concrete, this work emphasis on mechanical properties and micro-mechanism, besides, the service behaviors of fresh concrete was tested.The SSC concrete mechanical properties influenced by particles size of microbead, slag and gypsum were discussed.Mechanisms of mechanical properties changes were elaborated from micro, meso and macro scales, mechanical model was established and relevant rules of mechanical properties development were obtained.