Hma production
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HMA Production. Senior/Graduate HMA Course. What you will learn…. How gradation is controlled in a drum-mixer How asphalt is controlled in a drum-mixer Different styles of drum-mixers Using RAP with a drum plant. Drum-Mix Production. Hot Mix Asphalt production characterized by:

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HMA Production

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Hma production

HMA Production

Senior/Graduate

HMA Course


What you will learn

What you will learn….

  • How gradation is controlled in a drum-mixer

  • How asphalt is controlled in a drum-mixer

  • Different styles of drum-mixers

  • Using RAP with a drum plant


Drum mix production

Drum-Mix Production

Hot Mix Asphalt production characterized by:

  • Gradation Control at Cold Feed

  • Measure aggregate flow with belt scale

  • Meter asphalt binder to aggregate flow

  • Produce HMA continuously


Cold feed proportioning

Cold Feed Proportioning

Composite gradation is controlled at cold feed by proportioning material from individual bins.

Gradation and quality of the individual materials is controlled at the quarry.


Cold feed proportioning1

Cold Feed Proportioning

Variation in material flow from individual bins:

  • Based on variable speed motor on belt

  • Adjustable manual gates help control minimum and maximum flow


Cold feed proportioning2

Cold Feed Proportioning

  • Accomplished by calibrating the feeders

  • Material output is charted against belt speed in calibration charts

  • Different charts are created for different gate settings on the same feeder


Cold feed gradation control

Cold Feed Gradation Control

Many styles of feeder controls found in field.

All can perform satisfactory proportioning.


Asphalt binder proportioning

Asphalt Binder Proportioning

Asphalt binder must proportion to aggregate flow.

First step in asphalt binder proportioning is measuring aggregate flow.

Belt scale is used.


How a belt scale works

How a Belt Scale Works

  • Weigh bridge measures weight of aggregate.

  • Speed sensor measures speed of belt.

  • “Integrator / Totalizer” calculates aggregate flow in ton (tonnes) per hour

  • “Integrator / Totalizer” reports flow rate to plant control system


Asphalt binder proportioning1

Asphalt Binder Proportioning

Asphalt binder must proportion to aggregate flow.

Second step is regulating asphalt binder flow.

Asphalt binder pumping / metering unit is used.


How the asphalt binder proportioning system works

How the Asphalt Binder Proportioning System Works

  • Controls system reads wet aggregate flow from belt scale.

  • Controls accepts moisture content entered by operator to establish dry flow rate of aggregate

  • Control system accepts target asphalt content entered by operator.

  • Control system drives pumping/metering unit flow control device.

  • Control system adjusts asphalt binder flow control system based on signal received back from meter


Plant automation

Plant Automation

Many types of systems and levels of complexity found in the field.


Hma production

QUESTIONS ?


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