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Additives for strengthening backfill materials in steep coal seam mining.

Authors
Brechtel-CE; Thies-DA; Aggson-JR
Source
NTIS: PB/86-215894,1985; :1-116
Link
NIOSHTIC No.
10005193
Abstract
A testing program was conducted to design a cemented backfill for hydraulic placement in underhand cut-and-fill mining of a steeply dipping coal seam. The testing evaluated the use of three different backfill aggregates, locally available at the coal mine, with portland cement and five different pozzolans, including a class f fly ash, a class c fly ash, a cement kiln dust, and ground smelter slag. Both viscosity and uniaxial compressive strength of backfill mixtures with different pozzolan and portland cement contents were used to evaluate their suitability. Based upon the results of preliminary testing, an optimum mixture of alluvial sand with 6% portland cement and 10% class f pozzolan was chosen for further compression testing.
Keywords
Mining-industry; Coal-mining; Testing-equipment; Fly-ash; Cements; Compression-tests
Publication Date
19850101
Document Type
CP; Final Contract Report
Funding Type
Contract
Fiscal Year
1985
NTIS Accession No.
PB86-215894
NTIS Price
A07
Identifying No.
OFR 62-86
NIOSH Division
DRC
Source Name
NTIS: PB/86-215894
State
CO
Performing Organization
J. F. T. Agapito and Associates, Inc.
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