What are the major problems in using pumping for concreting works?

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In pumping operation, the force exerted by pumps must overcome the friction between concrete and the pumping pipes, the weight of concrete and the pressure head when placing concrete above the pumps. In fact, as only water is pumpable, it is the water in the concrete that transfers the pressure.

The main problems associated with pumping are the effect of segregation and bleeding. To rectify these adverse effects, the proportion of cement is increased to enhance the cohesion in order to reduce segregation and bleeding. On the other hand, a proper selection of aggregate grading helps to improve the pumpability of concrete.

This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.

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Comments
  • SANKAR K October 22, 2012 at 6:48 am

    i need briefly explain of pumpable concrete. and IS details………

  • BrodieHarvey November 29, 2012 at 12:28 am

    There are various problems with using pumping for concreting works. Pumping concrete is a device used to pour concrete into walls or slabs. It can be problematic if not done properly. Thanks for this sensible critique.

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