Causes and Solutions of Concrete Pump Damage

• Posted by Mavis Chai February 28, 2023 Filed in Technology #  #concrete pump  78 views
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  Meaning of concrete pump loss

  Pumping construction is one of the main construction methods of concrete at present. In the process of pumping, it is sometimes found that the slump of concrete into the pump is normal, but after pumping, the slump loss is serious, and even the fluidity is lost. We call this phenomenon "pumping loss".

  

   Reasons for pump loss

  The causes of concrete pump damage mainly include five aspects:

  1. Pump loss caused by sand aggregate absorbing water and additives.

  Because the sand and gravel aggregate contains certain pores and some fine powder (some also contain a small amount of mud powder), during the concrete mixing and transportation, the concrete mixture is in a state of no external force, and the water cannot quickly enter the smaller pores in the sand and gravel aggregate. During the pumping construction, the concrete mixture enters the pump pipe. Under the pump pressure, the free water in the concrete mixture is squeezed into the pores of the sand aggregate, resulting in the loss of free water in the mixture and the drying of the concrete. Under the pump pressure, some additive molecules will also be adsorbed, thus reducing or even losing the fluidity of the concrete mixture seen at the pump pipe outlet, resulting in pump damage. Clink here for concrete pump. 

  2. Pump loss caused by chemical reaction of cementing material.

  At present, some of the cement used in concrete has large specific surface area, fine cement particles, and sometimes there is the phenomenon of "undervulcanization". In the normal environment, the prepared concrete mixture works well. During the pumping process, due to the effect of pump pressure, the concrete mixture loses some water, which makes the internal components of the cementitious material paste contact more closely. At the same time, due to the increase of viscosity, the resistance of the concrete mixture to flow in the pump pipe increases, friction generates heat, accelerates the hydration reaction process of the cementitious material, and makes the concrete mixture lose its fluidity, It is manifested as pump loss. The key to this problem is the chemical reaction of cementitious materials and the increase of slurry temperature. Check out https://lutonmachinery.com/diesel-concrete-trailer-pump/

  

  3. Pump loss caused by too small displacement of pump during pumping.

  During the pumping construction of concrete mixture, some operators prefer to drive the displacement to 30% - 40%. At this time, the concrete mixture in the pump pipe is not filled with the delivery pipe, and there is a certain amount of air in the pump pipe. During the pumping process, the pump pipe is closed. Due to the effect of pump pressure, the air in the pipe moves in one direction due to the huge impact, taking away the slurry on the surface of gravel aggregate, At the same time, negative pressure is formed at the interface where the slurry is separated from the sand and gravel aggregate, which makes the water on the surface of the sand and gravel aggregate evaporate rapidly, and finally the concrete mixture seen at the outlet of the pump pipe loses its fluidity, resulting in the separation of the stone and the slurry, and the stone has no slurry at all. If the displacement is increased to 60% - 70% during the pumping process, the pump pipe is filled with homogeneous concrete mixture. During the pumping process, the concrete mixture moves forward under the driving pressure of the pump, and the friction resistance is very small. There is no water evaporation and separation of slurry and bone, so there will be no pump loss. Contact Luton Group for more construction machinery.