WET MIXED FIBRE REINFORCED SHOTCRETE

VAATSPRUTAD STAALFIBERARMERAD BETONG

Great efforts have been made in recent years to develop suitable production methods for steel fibre reinforced shotcrete. One interesting and promising method is the spraying of wet mixed shotcrete in combination with the addition of steel fibres in the spray nozzle, which could not be used previously owing to the stiffness of the material and the blockages caused by the fibres in the pump equipment. The object of this investigation is to elucidate the properties of the fresh fibre reinforced concrete mass as regards its cohesion and adhesion to the underlayer, as well as the properties of the hardened concrete as to compressive strength, flexural strength, impact strength, adhesion to rock, watertightness, water absorption and shrinkage. The strength values obtained are consistently better than those previously achieved, particularly in the case of flexural strength and impact strength, which are 2-3 times as high as those previously obtained. When wet mixed shotcrete without steel fibre reinforcement is compared with that with such reinforcement, the flexural strength is found to have increased by a factor of 4-6. There is no appreciable increase in bond strength in different types of rock due to the addition of steel fibres. All the samples were watertight according to kb 5, but penetration of water is somewhat greater when steel fibres are present. Fibre reinforcement appears to increase the cohesion of the fresh concrete, and as a result the concrete can be applied in thicker layers, particularly when sprayed on to vertical surfaces. Examples of practical applications, where wet sprayed fibre reinforced shotcrete can be used, are: supporting of rock, spraying of thin panels, spraying of arch and shell constructions. /TRRL/

  • Availability:
  • Corporate Authors:

    Swedish Council for Building Research

    St Goergansgatan 66, Box 27063
    S-11230 Stockholm,   Sweden 
  • Authors:
    • Sandell, B
  • Publication Date: 1978

Language

  • Swedish

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: 66 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00300456
  • Record Type: Publication
  • Source Agency: Swedish National Road and Transport Research Institute (VTI)
  • ISBN: 91-540-2924-4
  • Report/Paper Numbers: R87: 1978 Monograph
  • Files: ITRD, TRIS
  • Created Date: Oct 17 1979 12:00AM