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ASPHALT MIXING PLANT (Quality Management Process (Trial paving (assess…

- - - - aggregate is dried, heated & mixed with bitumen in the drum.
      - Mix is discharged into a hot conveyor that carries the mix to surge silo.
      - production rate is at 300 ton/hr.
  - - - Aggregate is removed from storage and passed through a dryer where it is heated.
      - Aggregate passes over a screening unit.
      - Combined aggregate is dumped into a mixing chamber, pugmill and mixed with asphalt.
      - Material is transferred to silo (100 ton/hr).
  - - - Uses a continuous flow of aggregates into the plugmill.
      - Bitumen is sprayed into the pugmill continuously.
      - Continuous mixing process.
- - - - eg. Marshall Mixture Design Method
    - - eg. bitumen content
  - - - eg. grading, bitumen content
  - - - eg. grading, bitumen content
- - - - material properties
        
        eg. different densities
      - environmental variables
        
        eg. rainy day
      - site condition
        
        eg. wet or dry
      - type of compaction equipment
    - - equipment selection
      - sequence of compaction
      - rolling patterns & speed
      - correct roller operation
      - timing from batching to paving
      - avoid over-compaction
  - - - variability in mix composition
      - finer fraction higher binder content
      - variation in density and voids
      - worse with large aggregate mixes
  - - - surface texture
      - riding quality
      - appearance
      - noise generation