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Tohver. Oil shale waste rock aggregate properties
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Transcript of Tohver. Oil shale waste rock aggregate properties
mi.ttu.ee
OIL SHALE WASTE ROCK OIL SHALE WASTE ROCK AGGREGATE PROPERTIES AGGREGATE PROPERTIES
WHICH DEPENDS ON WHICH DEPENDS ON CONTENT OF OIL SHALECONTENT OF OIL SHALE
Tarmo Tohver Department of Mining, Tallinn University of Technology
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The aim
• Resistance to fragmentation dependence on oil shale content
• Resistance to freezing and thawing dependence on oil shale content
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The Estonian oil shale deposit
RUSSIA
ESTONIA
OIL SHALE BEDDING DEPTH, meters
UNDERGROUND OIL SHALE MINING FIELDS
CALORIFIC YIELD, SHOWS ACTIVE DEPOSIT
OIL SHALE RESEARCH FIELDS
MINED OUT AREAS
OIL SHALE OPEN CAST FIELDS
35 GJ/m235 GJ/m235 GJ/m235 GJ/m235 GJ/m235 GJ/m235 GJ/m235 GJ/m235 GJ/m2
25
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25 GJ/m2
25 GJ/m2
25 GJ/m2
25 GJ/m2
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The oil shale stratum
Eesti Energia Kaevandused Co
The compressive strength of limestone: • layers D/C and C/B is 73 … 84 MPa • other layers is 40 … 62 MPa
The compressive strength of oil shale is• 20 …. 40 MPa
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Waste rock from separation plant
Calorific value 1.8 – 3.5 MJ/kg, size 5/100; 100/300
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Waste rock aggregate
Accordance with EVS-EN 13242:2002+A1:2007 Aggregates for unbound and hydraulically bound materials for use in civil engineering work and road construction
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Calorific value of the aggregate
Accordance with GOST 147-95. Solid mineral fuel. Determination of the highest combustion heat and calculation of the lowest combustion heat
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Selective crushing
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Resistance to fragmentation
Los Angeles Abrasion Tester
• sample with particles between 10/14 mm in size
• steel balls
• speed of 31 to 33 revolutions per minute for 500 revolutions
• The LA Coefficient is calculated from the proportion of the sample reduced to less than 1.6 mm in size
www.worldoftest.com
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Resistance to fragmentation
EVS-EN 1097-2:1998+A1:2006. Tests for mechanical and physical properties of aggregates – Part 2: Methods for the determination of the resistance to fragmentation.
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Resistance to freezing and thawing
• Test portions of single sized aggregates, having been soaked in pure water at atmospheric pressure for 24 h, are subjected to 10 freeze-thaw cycles.
• cooling to –17.5 ºC under water and then thawing to 20 ºC
• The freeze-thaw resistance of aggregate, as measured by the proportion of undersize passing the ½ size sieve as sieved from the test portion and then expressed as a mean % by mass
www.capco.co.uk
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Resistance to freezing and thawing
EVS-EN 1367-1:2007. Tests for thermal and weathering properties of aggregates – Part 1: Determination of resistance to freezing and thawing
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Conclusion
• The resistance to freezing and thawing of the oil shale waste rock aggregate is depending on content of oil shale
• Correlation between the resistance to fragmentation and particle size is very low
Thank You!
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Acknowledgment
• This research was supported by Estonian Science Foundation (Grant No. 7499 and Grant No. 8123)
Thank You!