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The stability of fresh cement paste can be described as its ability to remain homogeneous over time.Instability in the form of sedimentation and bleeding occurs for various reasons related to the material composition.In this study, the stability of fresh cement paste and relevant mechanisms for bleeding are reviewed, and a conceptual model is proposed describing the sedimentation progress in terms of bleeding.Moisture migration movement theory is applied to analysis the factors of concrete bleeding from bleeding source, bleeding channel and bleeding pressure.The development direction of admixture technology is to put more emphasis on the stability of cement paste.