混凝土的离析是混凝土拌合物组成材料之间的粘聚力不足以抵抗粗集料下沉，混凝土拌合物成分相互分离，造成内部组成和结构不均匀的现象。通常表现为粗集料与砂浆相互分离，例如密度大的颗粒沉积到拌合物的底部，或者粗集料从拌合物中整体分离出来。
某小型热电厂一台C15汽轮发电机在汽机基座浇筑过程中出现混凝土离析事故。
In a small thermo-power plant, an segregation accident occurred in the process of concreting a C15 turbogenerator foundation.
二是控制新拌混凝土的和易性，如果混凝土离析泌水，严格控制振捣时间，必须适时进行复振。
The second is control of workability of fresh concrete, if concrete isolation secretion of water, strictly control the vibration time, vibration rehabilitation must be timely.
辉绿岩多为层状解理，决定了轧制或破碎的碎石骨料的质量较差，配制的混凝土离析和泌水严重；
The diabase gravel almost was laminated cleavage, so the quality of aggregate by impurities and crushing was bad, segregation and bleeding of concrete made by the aggregate was heavy.
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