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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. VFA Blend 3 % binder Va % binder % binder %Gmm at Nini DP %Gmm at Nmax % binder % binder Selection of Design Asphalt Binder Content VMA % binder

  8. HMA PLANT OPERATION

  9. Types Of Plants BATCH DRUM MIXER

  10. 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.

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

  12. Batch Plant Batch Tower Pug Mill

  13. Burner - Batch Plant

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

  15. Drum Dryer Mixer

  16. Temperature Profile in Drum Mixer

  17. Dryer For Drum Dryer Mix Plant

  18. Dryer For A Drum Mixer Plant Aggregate Entry Point

  19. Small Drum Mixer Plant

  20. Plants are computer controlled

  21. HMA PLACEMENT

  22. To Be Covered • Hauling • Placement • Compaction

  23. Different types of trucks are Used

  24. Self Propelled Paver

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

  26. Self Propelled Paving Machine HMA Flow

  27. COMPACTION GOOD COMPACTION LEADS TO GOOD PERFORMANCE

  28. 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

  29. Temperature is critical

  30. Vibratory Roller

  31. Pnuematic Roller

  32. Steel Wheeled Roller

  33. Extracting A Core

  34. Questions - ?

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