Development of a fly ash-cement mine sealing system. Final report

Technical Report · Sat Mar 01 00:00:00 EDT 1975

OSTI ID:7344029

Maser, K R; Wallhagen, R E; Dieckmann, J

This report describes the development of a system which modifies an existing fly ash-foam remote mine sealing technique to make it capable of impounding water in a fire zone. Laboratory-scale determinations were made of the capillarity, permeability, shrinkage, and shear strength of various mixtures of fly ash, bentonite, lumnite, and cement. Leakage tests (1/4-scale) indicated that shrinkage in fly ash-cement mixtures always result in leakage, whereas fly ash-bentonite mixtures were impervious to water. Large-scale leakage tests with a 15-foot water head showed that a 1:1 fly ash-bentonite bulk seal with a 2-inch top layer of 1:1 fly ash-Huron cement is the optimum combination for a water-tight seal; a froth foam topping is suitable for providing an air-tight seal. A water leakage rate of about 1.5 gpm is predicted for the optimum combination of the above sealants in a typical mine with a 15-foot water head. Guidelines are given for determining the quantities of materials required for constructing a mine seal. (GRA)

• Research Organization: Foster-Miller Associates, Inc., Waltham, Mass. (USA)
• DOE Contract Number: H0144061
• OSTI ID: 7344029
• Report Number(s): PB-250611
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
COAL MINES
FIRES
SEALING MATERIALS
FLY ASH
CEMENTS
FIRE EXTINGUISHERS
FOAMS
PERFORMANCE
REMOTE CONTROL
SEALS
WATER
AEROSOL WASTES
BUILDING MATERIALS
COLLOIDS
CONTROL
DISPERSIONS
HYDROGEN COMPOUNDS
MATERIALS
MINES
OXYGEN COMPOUNDS
WASTES
012000* - Coal
Lignite
& Peat- Mining
010500 - Coal
Lignite
& Peat- Products & By-Products
010800 - Coal
Lignite
& Peat- Waste Management