Fresh concrete is either unsaturated or saturated. If unsaturated concrete is to be pumped through the pipe lines, then the pressure losses are calculated by using a theory of friction. The solution obtained from this theory shows that unsaturated concrete is practically unpumpable. For saturated concrete, two models are considered. In the first model, the requisite pumping pressure is calculated from the visocity and from the shear stress distribution, among other parameters. These variables are liable to vary within wide limits according to the composition of the concrete mix, and the theory is therefore difficult to apply in practice. The second model assures that the velocity distribution is constant over the cross section of the pipe line. The pressure losses are calculated from accelerational, gravitational, frictional and reaction forces. It is suggested that theoretical calculations be presented in a graphical form, thus enabling the effect of the design and construction of the pipe line system, for a given composition of the concrete mix, to be easily visualized.

  • Corporate Authors:

    Cement och Betonginstitut

    Drottning Kristinas Vaeg 26
    Stockholm 70,   Sweden 
  • Authors:
    • TUUTTI, K
  • Publication Date: 1976-7


  • Swedish

Media Info

  • Features: Figures; References;
  • Pagination: p. 7-10

Subject/Index Terms

Filing Info

  • Accession Number: 00148648
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 30 1977 12:00AM