Structural properties of steel-fiber-reinforced shotcrete and polymer-impregnated shotcrete, both plain and fiber-reinforced, were investigated by the Federal Bureau of Mines, Spokane Mining Research Center. The research center has found that flexural strengths can be increased by as much as 106 percent, and splitting-tensile strength by 50 percent, by introducing randomly oriented steel fibers. A slight decrease of compressive strength was found in the fiber-reinforced shotcrete. Polymer-impregnated shotcrete exhibited a threefold to fourfold increase in compressive and splitting-tensile strength. The techniques of preparing shotcrete with the dry process, using both fast-set agents and regulated-set cement, are described, along with the results of physical-property testing. Physical properties include compressive and splitting-tensile strengths, tangent and secant moduli, and stress-strain curves for plain shotcrete, fiber-reinforced shotcrete, and polymer- impregnated plain and fiber-reinforced shotcrete. Flexural strengths for plain and fiber-reinforced shotcrete are also reported. Steel-fiber shotcrete is the more promising of the new structural materials for ground support, and additional research is recommended.

  • Corporate Authors:

    Bureau of Mines

    C Street Between 18th and 19th Streets, NW
    Washington, DC  United States  20241
  • Authors:
    • Poad, M E
    • Serbousek, M O
    • Goris, J
  • Publication Date: 1975

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 25 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00095298
  • Record Type: Publication
  • Source Agency: Bureau of Mines
  • Report/Paper Numbers: RI 8001
  • Files: TRIS
  • Created Date: Jul 15 1975 12:00AM