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Mining Publication: Report on Early Strength Performance of Modern Day Weak Rock Mass Shotcrete Mixes
Keywords: Coal mining Mining workforce Rock mechanics Roof falls Underground mining
This page is archived for historical purposes and is no longer being maintained or updated.
Original creation date: February 2010
Authors: CC Clark, MA Stepan, JB Seymour, LA Martin
Conference Paper - February 2010
Download PDF Document (0.28 MB)
NIOSHTIC2 Number: 20036557
2010 SME Annual Meeting and Exhibit, February 28 - March 3, Phoenix, Arizona, preprint 10-138. Littleton, CO: Society for Mining, Metallurgy, and Exploration, Inc., 2010; :1-6
The National Institute for Occupational Safety and Health (NIOSH), Ground Control Engineering Branch is investigating the use of shotcrete in weak rock mass mines with the objective of reducing fatalities and injuries resulting from rock fall accidents. When shotcrete is used as part of a multi-element ground support system there is a need to know when the material has developed a threshold early compressive strength of approximately 1 MPa (145 psi) for safe re-entry of miner and machine into shotcreted mine workings. This equates to the material having developed enough strength to be self-supporting and allow for emplacement of the remaining support elements that require drilling of the shotcrete layer without degradation. NIOSH researchers have developed methods and portable test equipment to measure shotcrete strength on-site in the first six hours after application using the ASTM C 116-90 (1990) standard. These advances were demonstrated in tests on five commercially available shotcrete mixes, sprayed as dry shotcrete using the field expedient methods and equipment. The strength values from these tests allowed for real-time identification of the early strength threshold and were consistent with strengths reported using laboratory-type equipment. The findings of this NIOSH research for determining shotcrete early strength can improve mine safety by providing a method for determining initial site specific material property values to be used for design and as a means to conduct on-site quality control and monitoring during production.
Image of publication Report on Early Strength Performance of Modern Day Weak Rock Mass Shotcrete MixesConference Paper - February 2010
Download PDF Document (0.28 MB)
NIOSHTIC2 Number: 20036557
2010 SME Annual Meeting and Exhibit, February 28 - March 3, Phoenix, Arizona, preprint 10-138. Littleton, CO: Society for Mining, Metallurgy, and Exploration, Inc., 2010; :1-6
See Also
Diagnosing and Controlling Moisture-Sensitive Roof in Coal Mines
The Introduction of Roof Bolting to U.S. Underground Coal Mines (1948-1960): A Cautionary Tale
Pillar Mechanics of Coal Mine Bursts: A Control Strategy
Possible Impact of New Safety Technology Developments on the Future of the United States Mining Industry
Refuge Alternatives in Underground Coal Mines
Roof and Rib Fall Incident Trends: a 10-Year Profile
Safe and Economical Inerting of Sealed Mine Areas
Technique to Assess Hazards in Underground Stone Mines: the Roof Fall Risk Index (RFRI)
Ultra-Low Frequency Through-the-Earth Communication Technology
Wireless Mesh Mine Communication System
Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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