RESEARCH ON HYDRAULIC BURSTING OF CONCRETE AND ROCK

This research demonstrates the feasibility and optimizes the process of hydraulic bursting of concrete and rock. The project has demonstrated a new method for safely and efficiently disintegrating concrete and rock with low noise and low dust, for potential application in demolition or excavation in urban areas where blasting may not be allowed. The method involves drilling holes approximately 1.5 inches (38mm) in diameter to depths of about 6 inches (150mm) into the face, inserting a packer-injector unit and injecting water at pressures of 1000 to 2200 psi which causes the brittle material to fail in tension. Splitting of sandstone and Indiana limestone parallel to the drillhole was achieved. It was found that cracks could be initiated transverse to the drillhole and cones of concrete removed by applying a tension force to the packer prior to water injection. This conical failure mode is also attainable by tension alone on a rock anchor. A design concept for a tension fracture system is presented.

  • Corporate Authors:

    Terraspace, Incorporated

    304 North Stonestreet Avenue
    Rockville, MD  United States  20850

    National Science Foundation

    1800 G Street, NW
    Washington, DC  United States  20550
  • Authors:
    • Cooley, W C
  • Publication Date: 1978-3-31

Media Info

  • Pagination: 41 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00185905
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: NSF/RA-780058 Final Rpt., TR-421-1
  • Contract Numbers: NSF-C-APR77-19804
  • Files: TRIS
  • Created Date: Dec 29 1979 12:00AM