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Asphalt Concrete Mix Design and Construction

Asphalt Concrete Mix Design and Construction. Hot Mix Asphalt Concrete (HMA) Mix Designs. Objective: Develop an economical blend of aggregates and asphalt that meet design requirements Historical mix design methods Marshall Hveem New Superpave gyratory. Requirements in Common.

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Asphalt Concrete Mix Design and Construction

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  1. Asphalt Concrete Mix Design and Construction

  2. Hot Mix Asphalt Concrete (HMA)Mix Designs • Objective: • Develop an economical blend of aggregates and asphalt that meet design requirements • Historical mix design methods • Marshall • Hveem • New • Superpave gyratory

  3. Requirements in Common • Sufficient asphalt to ensure a durable pavement • Sufficient stability under traffic loads • Sufficient air voids • Upper limit to prevent excessive environmental damage • Lower limit to allow room for initial densification due to traffic • Sufficient workability

  4. Mixing Place pre-heated aggregate in bowl and add hot asphalt

  5. Mixing Place bowl on mixer and mix until aggregate is well-coated

  6. Compaction Example of typical full-size compactors.

  7. HMA PLANT OPERATION

  8. Types Of Plants BATCH DRUM MIXER

  9. Basic Purpose Of HMA Plants To produce a quality hot asphalt mixture that contains the desired proportions of asphalt and aggregate and meets all specifications.

  10. Batch planttypical layout Asphalt Storage Conveyor Belt Aggregate Bins Batch Tower Dryer Burner Hot elevator Storage Silo

  11. Batch Plant Batch Tower Pug Mill

  12. Burner - Batch Plant

  13. Drum Mixer Planttypical layout Asphalt Storage Conveyor Belts Aggregate Bins Dryer Burner Storage Silo

  14. Drum Dryer Mixer

  15. Temperature Profile in Drum Mixer

  16. Dryer For Drum Dryer Mix Plant

  17. Dryer For A Drum Mixer Plant Aggregate Entry Point

  18. Small Drum Mixer Plant

  19. Plants are computer controlled

  20. HMA PLACEMENT

  21. To Be Covered • Hauling • Placement • Compaction

  22. Different types of trucks are Used

  23. Self Propelled Paver

  24. Self Propelled Paving Machine THE BASIC PRINCIPLE HAS NOT CHANGED MUCH

  25. Self Propelled Paving Machine HMA Flow

  26. COMPACTION GOOD COMPACTION LEADS TO GOOD PERFORMANCE

  27. Reason For Compaction • To prevent further compaction • To provide shear strength or resistance to rutting • To ensure the mixture is waterproof • To prevent excessive oxidation of the asphalt binder

  28. Temperature is critical

  29. Vibratory Roller

  30. Pnuematic Roller

  31. Steel Wheeled Roller

  32. Extracting A Core

  33. The End

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