The article discusses the early problems associated with pumping satisfactory concrete mixes which incorporated lightweight aggregate. Methods of overcoming the high mixing-water absorption by the lightweight aggregate used pre-soaked aggregate and vacuum soaking to produce almost saturated aggregate. In the UK the use of low-pressure pumps combined with careful mix design has been partially successful with lytag aggregate. In another approach an admixture is used which seals the aggregate pores or allows the aggregate to be saturated without causing the mix to segregate. A number of contracts carried out in the UK are mentioned where use was made of two admixtures in a blend known as conplast 242. Lytag lightweight concrete mixes with this admixture blend have been pumped through 25 M vertically and 25 M horizontally using high pressure piston pumps. /TRRL/

  • Availability:
  • Corporate Authors:

    Morgan-Grampian (Professional Press) Limited

    Morgan-Grampian House, Calderwood Street
    London SE18 6QH,   England 
  • Publication Date: 1977-8

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00177383
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Sep 27 1978 12:00AM