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Mining Publication: Evaluation of Solid-Block and Cementitious Foam Seals
Keywords: Seals
Original creation date: January 1991
Authors: NB Greninger, ES Weiss, SJ Luzik, CR Stephan
Report of Investigations - January 1991
Download PDF Document (0.87 MB)
NIOSHTIC2 Number: 10011048
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9382, 1991 Jan; :1-13
The U.S. Bureau of Mines conducted explosion tests on various full- scale cementitious bulkheads used in abandoned mine areas to evaluate the ability of the bulkheads to withstand gas explosion overpressures of 20 psig. Tests were performed on 120-ft2 solid- concrete-block seals of varying thicknesses and designs. Of the seven solid-concrete-block seals tested, only the standard-type seal, having a 16-in thickness, keyed at the floor and ribs, all joints mortared, wedged at the roof, and a center pilaster, maintained its integrity when subjected to a 20-psig pressure wave. After being subjected to repeated explosions, the standard seal only showed a small hairline crack and had an air leakage of 87 ft3/min at a pressure differential of 1 in h2o. Tests were performed on cementitious foam seals of varying thicknesses and compressive strengths. Explosion tests have shown that 200-psi strength, 4- and 8-ft-thick seals can withstand a 20-psig pressure wave. At a pressure differential of 1 in h2o, no air leakage was detected through the 200-psi, 8-ft-thick foam seal.
Image of publication Evaluation of Solid-Block and Cementitious Foam SealsReport of Investigations - January 1991
Download PDF Document (0.87 MB)
NIOSHTIC2 Number: 10011048
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9382, 1991 Jan; :1-13
See Also
Clearing the Air
Comparison of Methods: Dynamic Versus Hydrostatic Testing of Mine Ventilation Seals
Demonstration of Safety Plugging of Oil Wells Penetrating Appalachian Coal Mines
Explosion Pressure Design Criteria for New Seals in U.S. Coal Mines
Inflatable Partitions for High-Expansion Foam Generators
Progress Toward Improved Engineering of Seals and Sealed Areas of Coal Mines
Strength Characteristics and Air-Leakage Determinations for Alternative Mine Seal Designs
Strengthening Existing 20-psi Mine Ventilation Seals With Carbon Fiber-Reinforced Polymer Reinforcement
Use of Ground Penetrating Radar and Schmidt Hammer Tests to Determine the Structural Integrity of a Mine Seal
Use of Pressure Swing Adsorption Technology to Inert Sealed Mine Areas with Nitrogen
Page last reviewed: April 1, 2015
Page last updated: April 1, 2015
Content source: National Institute for Occupational Safety and Health, Mining Program
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