SPRAYED REPAIR

This paper provides a progress report on a research programme into the use of wet process sprayed mortars for repair. At present, almost all sprayed concrete repair projects in the UK use the dry process. The wet process is still uncommon for repair work, but it has become dominant for large-scale tunneling applications involving robot-controlled spraying, for example in Scandinavia and then in the UK with the New Austrian Tunneling Method (NATM). The paper reports on a three-year research programme at Loughborough University in England, whose main aims have been to: (1) gain a fundamental understanding of the effects of the pumping/spraying process and mix constituents and proportions on the properties of fresh and hardened wet-mix sprayed concrete; (2) improve the wet-mix spraying process; (3) specify, measure, and optimise in-situ properties, especially strength, bond and durability; and (4) disseminate appropriate information to practising engineers in the UK. The dry process has three significant drawbacks. In some countries, there has been a significant swing towards the wet process, partly because of better control over mix proportions. The programme covered both fine and coarse mortars, and aimed to clarify the wet process for small-scale repair, especially mix design, test methods, and equipment.

  • Availability:
  • Corporate Authors:

    Palladian Publications Limited

    15 South Street
    Farnham Surrey GU97QU,   United Kingdom 
  • Authors:
    • Austin, S
    • Robins, P
    • GOODIER, C
  • Publication Date: 1998

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00766911
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Aug 2 1999 12:00AM