Results 1 - 8 of 8

• Strengthening an Existing 20-PSI Mine Seal with PPG's Polyurea Coated Retrofit
  7/22/2014 - Contracts and cooperative agreements
  A contract to develop a spray-applied polyurea coating system that would upgrade existing 20-psi approved mine seals to withstand blast pressures greater than 60 psi.
• Reinforcing Coal Mine Roof with Polyurethane Injection: 4 Case Studies
  10/1/2008 - Peer reviewed journal articles
  This paper gives the results of 4 case studies concerning the interaction between polyurethane (PUR) and coal mine roof in order to determine the mechanism of reinforcement, in both highly fractured rock and unfractured rock.
• Impact of Deformable Materials and Convergence on the Transverse Load Capacity of Mine Ventilation Stoppings
  6/1/2008 - Conference papers
  This paper presents the results of a NIOSH parametric study that quantifies the impact of various deformable materials in block stopping construction under transverse load conditions.
• Implementing Infrared Determination of Quartz Particulates on Novel Filters for a Prototype Dust Monitor
  5/1/2008 - Peer reviewed journal articles
  This article describes the results from analysis of open-face samples which suggest that the new formulations for PDM filters have fully addressed the analytical obstacles that existed with the original filter design.
• Performance of a Polyurethane Core Seal Tested in a Hydrostatic Chamber
  5/1/2008 - Reports of Investigations
  This paper presents the results of the full-scale test of a composite polyurethane-aggregate seal in a hydrostatic chamber conducted by NIOSH, and provides an analysis of those results in terms of the structural behavior of the seal.
• Strengthening Existing 20-psi Mine Ventilation Seals With Carbon Fiber-Reinforced Polymer Reinforcement
  1/1/2008 - Reports of Investigations
  This report discusses the testing and full-scale evaluations of a recently developed carbon fiber-reinforced polymer (CFRP) reinforcement technique for upgrading existing mine ventilation seals to withstand an explosion pressure of 50 psi or greater whi...
• The Effects of Scaling Height and Scaling Bar Design on Applied Forces and Bilateral Muscle Activity of the Back and Shoulders
  10/1/2006 - Conference papers
  Hand scaling is a physically demanding job responsible for overexertion injuries in mining. This experiment studied rib scaling from an elevated bucket to examine force generation capabilities and electromyographic responses to a prying subtask.
• Evaluation of Polyurethane Injection for Beltway Roof Stabilization in a West Virginia Coal Mine
  8/1/2004 - Conference papers
  Polyurethane injection is a proven method of rock stabilization in even the weakest, most broken ground. Optimization of the injection design by pre-injection video diagnostics can greatly contribute to successful and efficient roof stabilization.