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Magnesium Oxysulfate Cement Sealant in Coal Mines.

Authors
Fraley-JE; Simpson-RE
Source
NTIS: PB 255 613 :17 pages
Link
NIOSHTIC No.
10001062
Abstract
Magnesium oxysulfate cement has been specially formulated as a sealant in underground coal mines for reducing sloughing of shale roofs and coal ribs, for reducing air losses through block stoppings, for constructing sprayed stoppings over approved jute cloth or metal lath, and for reducing combustibility of polyurethane foam. A standard spray machine (Mining Enforcement and Safety Administration (MESA) approved) was used for the underground testing. Our research shows that a 1/2-inch coating reduces shale and coal sloughing, reduces air losses through block stoppings, and prevents fire propagation through a metal tunnel lined with polyurethane foam. During the underground tests, excess mixing water was used to improve pumping the slurry to the spray nozzle. This was later found to increase shrinkage cracks in the cured coatings. Controlling excess water is important to an acceptable coating.
Publication Date
19760101
Document Type
IH; Report of Investigations
Fiscal Year
1976
NTIS Accession No.
PB-255613
NTIS Price
A03
Identifying No.
RI 8150
NIOSH Division
SRC;
Source Name
NTIS: PB 255 613
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