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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.

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Presentation on theme: "1 Asphalt Concrete Mix Design and Construction. 2 Hot Mix Asphalt Concrete (HMA) Mix Designs Objective: – Develop an economical blend of aggregates and."— Presentation transcript:

1 1 Asphalt Concrete Mix Design and Construction

2 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 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 4 Place pre-heated aggregate in bowl and add hot asphalt Mixing

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

6 6 Example of typical full-size compactors. Compaction

7 7 % binder VMA % binder VFA % binder %G mm at N ini % binder %G mm at N max % binder DP % binder VaVa Blend 3 Selection of Design Asphalt Binder Content

8 HMA PLANT OPERATION

9 Types Of Plants BATCHDRUM MIXER

10 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 plant typical layout Storage Silo Batch Tower Dryer Conveyor Belt Aggregate Bins Burner Asphalt Storage Hot elevator

12 12 Batch Plant Batch Tower Pug Mill

13 13 Burner - Batch Plant

14 Drum Mixer Plant typical layout Storage Silo Dryer Conveyor Belts Aggregate Bins Burner Asphalt Storage

15 Drum Dryer Mixer

16 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 20 Plants are computer controlled

21 HMA PLACEMENT

22 22 To Be Covered Hauling Placement Compaction

23 23 Different types of trucks are Used

24 24 Self Propelled Paver

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

26 26 Self Propelled Paving Machine HMA Flow

27 27 COMPACTION GOOD COMPACTION LEADS TO GOOD PERFORMANCE

28 28 Reason For Compaction To prevent further compaction To prevent further compaction To provide shear strength or resistance to rutting To provide shear strength or resistance to rutting To ensure the mixture is waterproof To ensure the mixture is waterproof To prevent excessive oxidation of the asphalt binder To prevent excessive oxidation of the asphalt binder

29 29 Temperature is critical

30 30 Vibratory Roller

31 31 Pnuematic Roller

32 32 Steel Wheeled Roller

33 33 Extracting A Core

34 34 Questions - ?


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