FIELD-ORIENTED INVESTIGATION OF CONVENTIONAL AND EXPERIMENTAL SHOTCRETE FOR TUNNELS

The placement of shotcrete by the dry-mix process and the engineering properties of shotcrete, typically used for underground support, were investigated in detail. Processes and quality control aspects of shotcrete, previously taken for granted, were described, evaluated, and, where possible, quantified. Coarse-aggregate mixes of conventional shotcrete, steel fiber shotcrete, and regulated-set cement shotcrete were tested successfully underground using typical crews and equipment. Documentation included water-cement ratio, high-speed photographs of the airstream, x-rays of fibrous shotcrete, and special rebound tests that determined the change in rebound with thickness. The most important parameter affecting the measured value of average rebound was the total thickness shot. The process of rebound was described in detail qualitatively and in terms of newly-defined parameters. The economics of rebound was discussed. Compressive, flexural, and pull-out tests were conducted through an age of six months. Moment-thrust tests were also conducted.

• Corporate Authors:

  University of Illinois, Urbana-Champaign

  Urbana, IL  United States  61801

  Federal Railroad Administration

  Office of Research and Development, 1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Parker, H W
  • Fernandez-Delgado, G
  • Lorig, L J
• Publication Date: 1975-8

Media Info

• Pagination: 660 p.

Subject/Index Terms

• TRT Terms: Cement; Coarse aggregates; Compression tests; Documents; Field studies; Field tests; Flexural strength; Loads; Metal fibers; Photography; Properties of materials; Pull out test; Quality control; Rebound; Reinforcing materials; Shotcrete; Thickness; Tunnel lining; Tunnel supports; Tunnels; Underground structures; Water cement ratio; X rays
• Uncontrolled Terms: Documentation; Parameters
• Geographic Terms: Washington (District of Columbia)
• Old TRIS Terms: Compressive strength tests; Field investigations; Pullout; Underground supporting
• Subject Areas: Bridges and other structures; Construction; Data and Information Technology; Highways; Maintenance and Preservation; Materials;

Filing Info

• Accession Number: 00136895
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: UILU-ENG-75-2027 Final Rpt., FRA/ORD-76/06
• Contract Numbers: DOT-FR-30022
• Files: NTIS, TRIS, USDOT
• Created Date: Jul 22 1976 12:00AM