U.S. flag An official website of the United States government.
Official websites use .gov

A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS

A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

i

Tests of Fiber-Reinforced Shotcrete at the Chief Joseph Mine, Butte, Montana

Public Domain
File Language:
English


Details

  • Personal Author:
  • Corporate Authors:
    National Institute for Occupational Safety and Health. Spokane Research Laboratory
  • Description:
    Researchers from the Spokane Research Laboratory, National Institute for Occupational Safety and Health, in cooperation with engineers from the Department of Mining and Geological Engineering, Montana Tech, Butte, MT, conducted tests to evaluate the tensile strength, fiber count, and adhesion of shotcrete applied to panels at the Chief Joseph Mine, a research and training facility operated by Montana Tech. The tests were conducted in the mine ramp 45 m (150 ft) inward from the access portal at a 15.25-m- (50-ft) long test area divided into five 3-m- (10-ft) long sections. The shotcrete was applied with an Aliva 240.5 machine fitted with a predampener. Different amounts of fiber were entrained for each panel. Background data for the tests were obtained from earlier tests in Nevada, where the typical amount of fiber in the shotcrete is 6.54 kg/m3 (11 lb/yd3). All shotcrete was applied to a minimum thickness of 76 mm (3 in). Cylindrical cores were drilled at the wall-rock interface, and adhesion was tested after 28 days of curing. The goal of this research is to reduce the need to install multiple supports at the advancing face by creating a safer mining system that limits the time miners are exposed to unprotected roof.
  • Subjects:
  • Source:
    2005 SME Annual Meeting, February 28 - March 2, Salt Lake City, Utah, preprint 05-20. Littleton, CO, Society for Mining, Metallurgy, and Exploration, Inc., 2005 Feb; :1-6
  • Document Type:
    Text
  • Genre:
    Conference Publications
  • Place as Subject:
    Montana
  • CIO:
    National Institute for Occupational Safety and Health (NIOSH)
  • NIOSHTIC Number:
    nn:20032993
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:725fdaff193ddbecacb6691d287dcb50fd4404bc9af0e001d16148eb138b60f1d6f4902cb134894f0c8e3870b30ab4137182b48efce4c5fb3e881bd141596d7f
  • Download URL:
  • File Type:
    Filetype[PDF - 179.18 KB ]
PREVIOUS
File Language:
English
ON THIS PAGE
Details
CDC STACKS serves as an archival repository of CDC-published products including scientific findings, journal articles, guidelines, recommendations, or other public health information authored or co-authored by CDC or funded partners.

As a repository, CDC STACKS retains documents in their original published format to ensure public access to scientific information.
BACK TO TOP