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Strengthening existing 20-psi mine ventilation seals with carbon fiber-reinforced polymer reinforcement.

Authors
Weiss-ES; Harteis-SP
Source
NIOSH 2008 Jan; :1-38
NIOSHTIC No.
20033132
Abstract
The National Mining Association and the Mine Safety and Health Administration requested that the National Institute for Occupational Safety and Health (NIOSH) conduct fullscale 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. The evaluation was conducted in the NIOSH Pittsburgh Research Laboratory's Lake Lynn Experimental Mine (LLEM) near Fairchance, PA. The purpose of the evaluation was to determine the blast resistance of the CFRP reinforcement technique, designed to increase the strength of two types of existing 20-psi-rated in situ mine ventilation seals. Two candidate ventilation seals were selected to represent the 20-psi alternative seal designs typical of those used in mines prior to July 2006. Installed within the LLEM were (1) a 4-ft-thick pumpable cementitious foam seal using material with a designed 150- to 200-psi average compressive strength at 28 days and (2) a 24-in-thick, low-density cementitious block seal with a center pilaster and keyed to the floor and ribs. The materials necessary for the CFRP reinforcement technique were then installed on the outby (active) side of each seal, and the seals were subjected to explosion overpressures. Both seals with the CFRP reinforcement retrofit successfully withstood explosion pressures of 60 psi or greater during the full-scale evaluations in the LLEM.
Keywords
Mine-seals; Mining-industry; Engineering-controls; Control-technology; Ventilation; Explosions
Publication Date
20080101
Document Type
Numbered Publication; Report of Investigations
Fiscal Year
2008
NTIS Accession No.
PB2008-107358
NTIS Price
A04
Identifying No.
(NIOSH) 2008-106; RI-9673
NIOSH Division
PRL
Priority Area
Mining
Source Name
National Institute for Occupational Safety and Health
State
PA
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