Tohver. Oil shale waste rock aggregate properties


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Tohver. Oil shale waste rock aggregate properties

  1. 1. OIL SHALE WASTE ROCK AGGREGATE PROPERTIES WHICH DEPENDS ON CONTENT OF OIL SHALE <ul><li>Tarmo Tohver </li></ul><ul><li>Department of Mining, Tallinn University of Technology </li></ul>
  2. 2. The aim <ul><li>Resistance to fragmentation dependence on oil shale content </li></ul><ul><li>Resistance to freezing and thawing dependence on oil shale content </li></ul>
  3. 3. The Estonian oil shale deposit
  4. 4. The oil shale stratum Eesti Energia Kaevandused Co <ul><li>The compressive strength of limestone: </li></ul><ul><li>layers D/C and C/B is 73 … 84 MPa </li></ul><ul><li>other layers is 40 … 62 MPa </li></ul><ul><li>The compressive strength of oil shale is </li></ul><ul><li>20 …. 40 MPa </li></ul>
  5. 5. Waste rock from separation plant Calorific value 1.8 – 3.5 MJ/kg , size 5 /100; 100/300
  6. 6. 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
  7. 7. 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
  8. 8. Selective crushing
  9. 9. Resistance to fragmentation <ul><li>Los Angeles Abrasion Tester </li></ul><ul><li>sample with particles between 10 / 14 mm in size </li></ul><ul><li>steel balls </li></ul><ul><li>speed of 31 to 33 revolutions per minute for 500 revolutions </li></ul><ul><li>The LA Coefficient is calculated from the proportion of the sample reduced to less than 1.6 mm in size </li></ul>
  10. 10. 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 .
  11. 11. Resistance to freezing and thawing <ul><li>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. </li></ul><ul><li>cooling to –17.5 ºC under water and then thawing to 20 ºC </li></ul><ul><li>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 </li></ul>
  12. 12. 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
  13. 13. Conclusion <ul><li>The resistance to freezing and thawing of the oil shale waste rock aggregate is depending on content of oil shale </li></ul><ul><li>Correlation between the resistance to fragmentation and particle size is very low </li></ul><ul><li>Thank You! </li></ul>
  14. 14. Acknowledgment <ul><li>This research was supported by Estonian Science Foundation ( Grant No. 7499 and Grant No. 8123 ) </li></ul><ul><li>Thank You! </li></ul>