Concrete in the transport, vibration, pumping process, there will be coarse aggregate sinking, floating water phenomenon, which is called concrete bleeding.Generally, the indexes to describe the bleeding characteristics of concrete include bleeding rate and bleeding volume.The effective ways to solve this phenomenon are as follows：

1、Selection of high - quality air - entraining agent, more detailed cementing materials.

2、For fresh concrete, appropriate control points are selected to reduce the bleeding of concrete.Strictly control the vibration time of concrete to avoid excessive vibration.By selecting the control point at the warehouse entrance, the maximum gas content can be controlled to minimize the influence of gas content loss on bleeding during the concrete transportation.

3、In the premise that assures construction performance, reduce unit water consumption as far as possible.

4、The proportion of concrete, appropriate to increase the amount of cementing materials, appropriate to provide concrete sand rate, in the premise of not meeting other properties, so that the concrete amount of air.

5、Select water reducing agent with smaller bleeding.If the proportion is fixed, in the premise of meeting the standards and the use of requirements, choose the appropriate water reducer water reducer, to avoid excessive water reduction rate caused by bleeding.

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