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ASPHALT MIXING PLANT (Quality (Laboratory Mix Design (Final optimum mix…

- - - - Bitumen Content
      - Void in Total Mix (VTM)
      - Void Filled in Bitumen (VFB)
      - Void in Min (VMA)
      - Flow
      - Stability
  - - - Grading
      - Bitumen Conten
      - Void in Total Mix (VTM)
      - Void in Min (VMA)
      - Flow
      - Stability
  - - - Assess constructability of mix
      - Test the properties of field samples
      - Establish required compacting effort
      - Establish production mix parameters
      - Set Tolerance for acceptance control
  - - - Grading
      - Bitumen Content
      - Void in Total Mix (VTM)
      - Density
      - Layer thickness and levels
- - - - Equipment selection
      - Sequence of compaction
      - Rolling patterns and speed
      - Timing from batching to paving
      - Correct roller operation
      - Avoid over compaction
  - - - Difficulty in achieving density
      - Water permeability of mat
      - Ageing of binder
  - - - Variability in mix composition
      - Finer fraction higher binder content
      - Variation in density and voids
      - Worse with large aggregate mixes