CONCRETE FOR TUNNEL LINERS: MIX DESIGN RECOMMENDATIONS FOR PROTOTYPE EXTRUDED LINER SYSTEM

Fiber reinforced, quick-setting cement concrete mix designs are suggested for use in the development of a prototype liner system. These mix designs can meet the structural and durability requirements of the tunnel liner and can be placed in a slipform by pumping. The mix designs are governed mainly by the fact that the mix must be pumpable. Aggregate shape and gradation are critical. A mix with a high likelihood of pumpability can be formulated by adherence to a procedure based on prevention of segregation failure, the most common pumping failure mode of fiber reinforced concrete. Fiber reinforced concrete mixes proportioned for pumping are of high strength, by normal standards, because of the paste content necessary for workability. Conventional pumping equipment is believed adequate for placing properly designed fiber reinforced concrete mixes if components are selected to minimize line head losses and minimize remolding of the concrete. Mixes for a specific field application should be tested for set times, pumpability and strength, using field procedures for batching, mixing, and placing, prior to actual field use.

  • Supplemental Notes:
    • This project was sponsored by FRA.
  • Corporate Authors:

    University of Illinois, Urbana-Champaign

    Department of Civil and Environmental Engineering
    205 North Mathews Avenue
    Urbana, IL  United States  61801-2352

    Federal Railroad Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Halvorsen, G T
    • Kesler, C E
    • Paul, S L
  • Publication Date: 1975-8

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 29 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00127848
  • Record Type: Publication
  • Source Agency: Federal Railroad Administration
  • Report/Paper Numbers: FRA OR&D 75-89 Final Rpt.
  • Contract Numbers: DOT FR 30022
  • Files: NTIS, TRIS, USDOT
  • Created Date: Dec 29 1976 12:00AM