The authors refer to earlier work on the simplification of post-tensioned concrete anchorages which showed the advantages to be gained by using a high strength grout to provide the main prestress retention. It is suggested that the associated grout development work, whose principle findings are described in this article, has wider application and could include jointing and repairs to structural members. The effects of variations in water-cement ratio, additive type and amount, and inclusion or not of an aggregate on grouting efficiency and strength were all considered, and the resulting data are described. A standard mixing procedure was adopted throughout the testing. The grouting efficiency was measured by a fluidity test using an immersion apparatus, except where the grout was too thixotropic to allow a plunger movement when pumpability was observed instead, and by a stability test in a standard glass cylinder. The results obtained indicated A loss in strength of high alumina cement (hac) even at low water cement ratios, and the authors preferred to avoid conversion uncertainties by employing a sulphated high alumina cement (shac) consisting of one part calcium sulphate to three parts hac by weight in which a stable sulphoaluminate hydrate was produced at the time of mixing. The authors believe that shac may be used with confidence in grouting operations requiring material of sustained high strength. /TRRL/

  • Availability:
  • Corporate Authors:

    Cement and Concrete Association

    52 Grosvenor Gardens
    London SW1W 0AQ,   England 
  • Authors:
    • HUGHES, B P
    • Middleton, C I
  • Publication Date: 0

Media Info

  • Features: Photos; References; Tables;
  • Pagination: p. 31-32
  • Serial:
    • Volume: 9
    • Issue Number: 10
    • ISSN: 0010-5317

Subject/Index Terms

Filing Info

  • Accession Number: 00133753
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Jun 23 1976 12:00AM