The Klarcrete concrete cutting machine is designed to eliminate hand labor and to speed up the actual cutting of concrete. It is composed of a number of percussive tools, each fitted with a compartively heavy head, that can be moved over the area to be cut in a controlled and repetitive manner. In the design of the machine, one of the first considerations was that the equipment should operate dry, to avoid problems of drainage and hinderance by frost. At the same time care was taken to ensure lack of damage to the remaining concrete slab, e.g. through loosening of the aggregate particles within the matrix, a problem associated with the use of percussive tools making a wedge-shaped impacted into the surface. The machine is based on a self-propelled frame able to tow its own power supply, a 600 cfm portable compressor. It is mounted on four pads from which air is evacuated after the machine has been positioned, the resulting vacuum causing a downward thrust capable of holding the unit firm during its operation, and thus ensuring clean edges to the area cut out and preventing spalling and cracking beyond. All operations on the machine are carried out by one man. The machine has been adapted, not only to cut square or rectangular holes in concrete, but it is now capable of mass area brush hammering to expose the aggregate and provide a key for subsequent topping such as granalithic concrete, resin, etc. Another operation developed was bump cutting, which can remove localized high spots in the concrete. Using the cutting technique, machines have been designed to cut circular holes, up to 4 in. deep and up to 16 in. in diameter to receive airfield lighting fittings. /HRIS/

  • Supplemental Notes:
    • Appeared in "Special Reports on: Use of Equipment and Methods of Maintenance".
  • Corporate Authors:

    Federal Highway Administration

    Construction and Maintenance Division, 1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Clarke, RAW
  • Publication Date: 1975-7

Media Info

  • Features: Photos;
  • Pagination: 6 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00126297
  • Record Type: Publication
  • Files: TRIS, USDOT
  • Created Date: Oct 18 1975 12:00AM