Common problems in concrete pumping project of super high-rise building

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According to a large amount of data and practice, pumping pipe clogging is the most common problem in concrete pumping for super high-rise structures.

The main reason of pumping pipe blockage is the poor pumping ability and working performance of concrete mixes, and the ratio and materials do not meet the construction requirements. Specific performance is as follows.

1, whether the strength level of high-fluidity concrete meets the design strength.

2, high strength concrete viscosity, poor fluidity, can not meet the pumping requirements of super tall buildings, easy to cause pipe blockage.

3、When the fluidity of concrete is too large, its ability to resist segregation and water secretion will be reduced. Under the action of pump pressure, the segregation of concrete will cause the separation of aggregate and mortar, and in the case of mortar without lubrication, the coarse aggregate will increase friction with the pump in direct contact with the pipe, causing the pipe to be blocked.

4, ready-mixed concrete from the mixing plant to the construction site takes a certain amount of time, which will reduce the workability of the concrete and make the pumpability worse. This is manifested by the decrease in expansion value and slump value, which eventually leads to the clogging of the pump pipe.


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