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HMA PLACEMENT

HMA PLACEMENT . To Be Covered. Hauling Placement Compaction. Tandem Axle End Dump Truck. High Dump Semi-truck. Belly Dump. Multi-WHEELED Conveyor Feed. Self Propelled Paver. Self Propelled Paving Machine. THE BASIC PRINCIPLE HAS NOT CHANGED MUCH. Self Propelled Paving Machine.

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HMA PLACEMENT

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  1. HMA PLACEMENT

  2. To Be Covered • Hauling • Placement • Compaction NCAT

  3. Tandem Axle End Dump Truck NCAT

  4. High Dump Semi-truck NCAT

  5. Belly Dump NCAT

  6. Multi-WHEELEDConveyor Feed NCAT

  7. Self Propelled Paver NCAT

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

  9. Self Propelled Paving Machine HMA Flow NCAT

  10. Screed Unit NCAT

  11. Forces On Screed NCAT

  12. ONE OF THE ESSENTIALS FOR A CONSISTENT AND HIGH QUALITY HOT MIX ASPHALT PAVEMENT IS TO PROVIDE FOR A CONTINUOUS OPERATION NCAT

  13. NCAT

  14. Material Transfer Device NCAT

  15. COMPACTION GOOD COMPACTION LEADS TO GOOD PERFORMANCE NCAT

  16. 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 NCAT

  17. Durability vs Air Voids Stability Cohesion Zone of Highest Durability Flushing Raveling 0 % Air Voids NCAT

  18. Factors Affecting Compaction • Mix Properties • Aggregate • Asphalt • Mix Temperature • Layer Thickness • Environmental Factors • Rollers NCAT

  19. Temperature is critical NCAT

  20. Rollers • Vibratory • Pneumatic-tired • Steel wheeled tandem rollers NCAT

  21. Vibratory Roller NCAT

  22. Pnuematic Roller NCAT

  23. Steel Wheeled Roller NCAT

  24. Checking Density With Nuclear Gauge NCAT

  25. Extracting A Core NCAT

  26. Questions - ? NCAT

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