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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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Presentation Transcript
hot mix asphalt concrete hma mix designs
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
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
slide4

Mixing

Place pre-heated aggregate in bowl and add hot asphalt

mixing
Mixing

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

compaction
Compaction

Example of typical full-size compactors.

slide7

VFA

Blend 3

% binder

Va

% binder

% binder

%Gmm at Nini

DP

%Gmm at Nmax

% binder

% binder

Selection of Design Asphalt Binder Content

VMA

% binder

types of plants
Types Of Plants

BATCH

DRUM MIXER

basic purpose of hma plants
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.

batch plant typical layout
Batch planttypical layout

Asphalt Storage

Conveyor Belt

Aggregate Bins

Batch Tower

Dryer

Burner

Hot elevator

Storage Silo

batch plant
Batch Plant

Batch Tower

Pug Mill

drum mixer plant typical layout
Drum Mixer Planttypical layout

Asphalt Storage

Conveyor Belts

Aggregate Bins

Dryer

Burner

Storage Silo

slide18

Dryer For A Drum Mixer Plant

Aggregate Entry Point

to be covered
To Be Covered
  • Hauling
  • Placement
  • Compaction
self propelled paving machine
Self Propelled Paving Machine

THE BASIC PRINCIPLE HAS NOT CHANGED MUCH

compaction27
COMPACTION

GOOD COMPACTION LEADS TO GOOD PERFORMANCE

reason for compaction
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