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The National Institute for Occupational Safety and Health (NIOSH)





Mining Publication: A Shotcrete Adhesion Test System for Mining Applications
Keywords: Fibrous shotcrete Shotcrete Tensile tests
Original creation date: January 2011
Authors: JB Seymour, LA Martin, CC Clark, MA Stepan, RD Jacksha, RT Pakalnis, M Roworth, C Caceres
Peer Reviewed Journal Article - January 2011
Download PDF Document (4.57 MB)
NIOSHTIC2 Number: 20038056
Trans Soc Min Metal Explor TP-09-061, 2011 Jan; 328:533-541
The National Institute for Occupational Safety and Health (NIOSH) is conducting research to develop safe practices for the use of shotcrete as ground support in underground mines, particularly mines operating in weak host rock. As part of this research, a rugged, portable direct tensile test system was developed for measuring shotcrete adhesion strength in underground mines. During the development of this test system, more than 185 direct tensile tests were conducted with a common, commercially available macro-synthetic fiber-reinforced shotcrete that was applied to concrete test panels using a dry mix process and machinery. The average bond strength of the shotcrete to the concrete substrate typically increased as a function of the shotcrete’s curing age, ranging from 0.44 MPa (64 psi) after one day of curing to 1.58 MPa (229 psi) after 90 days of curing. Adhesion strength increased markedly between one and three days of curing, reflecting a similar trend of increasing shotcrete tensile strength with curing time. This robust direct tensile test system can improve mine safety by providing a reliable means of measuring shotcrete adhesion strength and also supplying important information about the quality of the applied shotcrete and the competency of the underlying rock.
Image of publication A Shotcrete Adhesion Test System for Mining ApplicationsPeer Reviewed Journal Article - January 2011
Download PDF Document (4.57 MB)
NIOSHTIC2 Number: 20038056
Trans Soc Min Metal Explor TP-09-061, 2011 Jan; 328:533-541
See Also
An Analysis of Flexural Strength and Crack Width for Fiber-Reinforced Shotcrete Used in Weak Rock Mines
Bending Fatigue Tests 2 and 3 on 2-Inch 6x25 Fiber Core Wire Rope
Developments in Sealant Support Systems for Ground Control
Early Strength Performance of Modern Weak Rock Mass Shotcrete Mixes
The Long-term Performance of Surface Support Liners for Ground Control in an Underground Limestone Mine
A Practical Method of Measuring Shotcrete Adhesion Strength
Technology News 434 - An 'Insulating' Shotcrete for Heat Abatement in Deep Mines
Technology News 540 - Field-Expedient Shotcrete Adhesion Test System
Technology News 542 - Field Use Round Determinate Panel Test System
Tests of Fibre-Reinforced Shotcrete at the Chief Joseph Mine, Butte, Montana
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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