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UNIVERSITA DEGLI STUDI DI CAGLIARI Dipartimento Ingegneria del Territorio

UNIVERSITA’ DEGLI STUDI DI CAGLIARI Dipartimento Ingegneria del Territorio. Mechanical and Chemical Reliability of Mine Waste Material for Road Embankment and Subgrade S. Portas, M. Coni, F. Maltinti, A. Lippi, F. Pisanu. 2011 TRB Waste Management & Resource Efficiency Workshop

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UNIVERSITA DEGLI STUDI DI CAGLIARI Dipartimento Ingegneria del Territorio

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  1. UNIVERSITA’ DEGLI STUDI DI CAGLIARI Dipartimento Ingegneria del Territorio Mechanical and Chemical Reliability of Mine Waste Material forRoad Embankment and SubgradeS. Portas, M. Coni, F. Maltinti, A. Lippi, F. Pisanu 2011 TRB Waste Management & Resource Efficiency Workshop "Sustainability and Liability in Transportation" July 25th - 27th, 2011 in Portland, Oregon UNIVERSITA DEGLI STUDI DI CAGLIARI Dipartimento Ingegneria del Territorio

  2. OUTLINE • Introduction • Scope • Experimental studies • Results • Summary

  3. INTRODUCTION • Alternative materials • Availability • Material type • Environmental safe • Leaching properties • Mechanical properties • Laboratory tests • In site validation • Guide lines • Construction procedures • Controls

  4. SCOPE • Evaluate chemical properties • Study mechanical behaviour • Laboratory • Experimental embankment • Develop guidelines

  5. COAL MINE DEBRIS • Coalminingby-products: • Large quantities of residual wastes most part earth- or rock-like in nature. • 50% of the estracted material • Chemical Composition: • Sedimentaryrocks • SiO2 40-70% • Al2O3, smallquantitiesof Fe2O3, K2O e Na2O • Smallamountofcoal(10-20%)

  6. TEST ORGANIZATION • Leaching tests • Laboratory • In situ • Grading test • Quality tests • Los Angeles • Bearing capacity • CBR Index • LFWD • Static Plate • Improvement tests • Chemical stabilization

  7. HARMFUL COMPOUNDS • No potenzialrisk

  8. LABORATORY TESTS • Grading curve • LA tests • CBR

  9. IN SITU TESTS • ExperimentalEmbankment • Leaching test • Plate test

  10. SUMMARY • Low concentration harmful compounds • good quality for embankment and subgrade • Mechanical behaviour improved with stabilization

  11. THANK YOUQUESTIONS?

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