6. Pipe blockage caused by unqualified pumping concrete:

The concrete used for pumping must meet the requirements of pumping concrete, not all concrete can be used for pumping, not qualified pumping concrete will increase the pump wear, and often appear blocked, burst pipe phenomenon.

6.1 concrete collapse is too large or too small

The collapse degree of concrete directly reflects the fluidity of concrete, and the transport resistance of concrete decreases with the increase of the collapse degree.The collapse degree of pumped concrete is generally within the range of 8 ~ 450px, and the pumping degree for long distance and high height should be strictly controlled at about 375px.Collapse is too small, will increase the delivery pressure, aggravating wear equipment, and cause pipe blockage.Collapse too large, under high pressure concrete easy segregation and cause blockage.

6.2 too small sand content and unreasonable grading of coarse aggregate

Fine aggregate can be divided into river sand, artificial sand, sea sand and mountain sand according to the source, among which river sand has the best pumpability and mechanical sand has the worst.Fine aggregate can be divided into coarse sand, medium sand and fine sand according to particle size, medium sand has the best pumpability.

Coarse aggregate by shape can be divided into: pebble, gravel.Pebbles are better at pumping than gravel.The maximum particle size of aggregate is also related to the minimum diameter of conveying pipeline. The maximum particle size of pebble should be less than 1/3 diameter, and the maximum particle size of gravel should be less than 1/4 diameter, otherwise it is easy to cause pipe blockage.

Because of different materials, there is an optimal value for the content of fine aggregate and grading of coarse aggregate.Under normal circumstances, the sand content should not be too low, should be more than 40%, large particle size coarse aggregate content should not be too high.Reasonable selection of sand content and determination of aggregate gradation are very important to improve pumping performance of concrete and prevent pipe clogging.

6.3 too little or too much cement

In pumping concrete, cement cementation and lubrication, cement has a good water retention performance at the same time, makes concrete to secrete in the process of pumping water, the dosage of the cement is a best value, if the cement dosage is too little, will seriously affect the aspiration of concrete, at the same time make pumping resistance increases, the water retention of concrete, easy bleeding, segregation and blocking pipe.Under normal circumstances, the content of cement in each cubic meter of concrete should be more than 320Kg, but not too much, too much cement will increase the viscosity of concrete, thus causing the increase of transport resistance.

6.4 unreasonable selection of additives

There are many kinds of additives, such as: aerating agent, water-reducing agent, superplasticizer, retarding agent, pumping agent, etc.The unreasonable admixture will make the pumping and fluidity of concrete become worse, which will lead to pipe plugging.

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