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Selected Pneumatic Gunites for Use in Underground Mining: A Comparative Engineering Analysis.
MISSING :64 pages
Fibered, portland-cement-based gunite products were applied in the Bureau of Mines Lake Lynn Laboratory Experimental Mine using a variety of pneumatic guns and gunning crews. The demonstrated wet- mix (with silica fume), dry-mix, and surface bonding products were sampled by the Bureau and subjected to a suite of engineering analyses. Gunite flexural and compressive strength, rebound, permeability, porosity, dust loading, shooting rate, crew requirements, and cost factors were evaluated. Steel, fiberglass, or polypropylene fibers were contained in all but two of the gunites tested. Both Bureau and private testing laboratory analyses are provided for some products. Electron probe microanalysis and x-ray diffraction analysis were performed on the silica fume fraction of the wet-mix gunite to characterize the dust. Aggregate size fraction distribution analyses were performed to provide strength relationships. Results indicate that all of the commercially available fibered gunite materials tested can provide beneficial sealant, spill prevention, or roof stability control attributes for underground mining environments.
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Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division