This report describes the Atlas Copco Conjet, the method of cutting concrete with a high pressure water jet. The method produces a concrete surface which provides good bond with new concrete. The equipment was originally developed for cutting away damaged concrete on horizontal surfaces but it can now also be used on vertical surfaces and also at other angles. The equipment can be used in all reinforced and unreinforced concrete structures, e.g. bridge slabs, bridge piers. There is constant development of accessories and working procedures. The report is addressed to designers and developers/property managers who must decide on repairs to damaged RC structures. Examples are given, and the resistance to jetting of different concrete types, advantages and disadvantages, capacities and costs are discussed. The nozzle is held in a robot. The noise level is 74 dB 7m from the container and 93 dB 7m from the robot, as against 103 dB for a hand held pneumatic hammer. There is no dust and no vibration; bond between reinforcement and concrete is not destroyed. Capacity for 25-35 mm cut is 7-18 square meter/h. Total cost in 1986 was SEK 400-1200/square meter, which was comparable with cost of manual cutting. The disadvantage of the method is the large volume of water used. (TRRL)

  • Availability:
  • Corporate Authors:

    Statens Raad Foer Byggnadsforskning

    St Goeransgatan 66
    Stockholm,   Sweden 
  • Authors:
    • Nilsson, I
  • Publication Date: 1989


  • Swedish

Media Info

  • Features: References;
  • Pagination: 82 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00617182
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • ISBN: 91-540-5106-1
  • Report/Paper Numbers: Rept No. 95
  • Files: ITRD, TRIS
  • Created Date: Nov 30 1991 12:00AM