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New Techniques for Reducing Stopping Leakage.

Authors
Timko-RJ; Thimons-ED
Source
MISSING :15 pages
Link
NIOSHTIC No.
10003104
Abstract
Because of leakage through and around permanent stoppings in underground mines, more air must be forced into a mine than would otherwise be required for ventilation. As power costs increase, costs resulting from air leakage add increasingly to the operating costs of mining. The Bureau of Mines evaluated four different stopping construction techniques based on the ideas that (1) airtightness could be enhanced by brushing rather than troweling on mortar sealant and that (2) modified mortars (mortars containing glass fibers and other additives for increased strength and adhesion) would improve sealing performance. Air leakage tests comparing conventional to modified stoppings were done when the stoppings were built, after 6 months, after 1 yr, and following simple maintenance. It was found that stoppings can be built and maintained better if (1) the area where a stopping is to be built is properly prepared; (2) stoppings are periodically examined for leaks; and (3) stoppings found to be leaking, especially at the perimeters, are resealed.
Publication Date
19830101
Document Type
IH; Information Circular;
Fiscal Year
1983
NTIS Accession No.
NTIS Price
Identifying No.
IC 8949
NIOSH Division
PRC;
Source Name
MISSING
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