Production, Transportation, Placement and Compaction Equipment Advances for

Enhanced HMA Quality

CUPGA 2009Dennis Hunt, Gencor Industries, Inc.

Control of Temperature

•Production•Storage•Transportation•Placement•Compaction

CUPGA 2009Dennis Hunt, Gencor Industries, Inc.

Flue Gasses

High CO but Low NOx Low CO but High NOx

CUPGA 2009Dennis Hunt, Gencor Industries, Inc.

Burner Technology

CUPGA 2009Dennis Hunt, Gencor Industries, Inc.

Linkage Drive motors

Flue Gas Characterization

CUPGA 2009Dennis Hunt, Gencor Industries, Inc.

Production Temperature

CUPGA 2009Dennis Hunt, Gencor Industries, Inc.

CUPGA 2009Dennis Hunt, Gencor Industries, Inc.

Production Temperature

CUPGA 2009Dennis Hunt, Gencor Industries, Inc.

CUPGA 2009Dennis Hunt, Gencor Industries, Inc.

Silo Storage

Decreased Oxidation163oC127oC

CUPGA 2009Dennis Hunt, Gencor Industries, Inc.

• Heat transfer is thermal energy in transit due to a spatial temperature difference– The greater the difference in temperature between

an object and its surroundings the greater the heat transfer rate will be.

• Newton’s Law of Cooling– The law states that the rate of change of the

temperature of an object is proportional to the difference between its initial temperature T0 and the ambient temperature Ta at time t.

CUPGA 2009Dennis Hunt, Gencor Industries, Inc.

Temperature Transfer

Transportation

CUPGA 2009Dennis Hunt, Gencor Industries, Inc.

Δ T

Temperature Trial

• Denver, Co – 2/19/2009• 200 tons surface mix• 20% RAP

• Ambient temperature 6oC• 105oC behind screed

• Pavement density 94.6%

CUPGA 2009Dennis Hunt, Gencor Industries, Inc.

CUPGA 2009Dennis Hunt, Gencor Industries, Inc.

CUPGA 2009Dennis Hunt, Gencor Industries, Inc.

Compaction

CUPGA 2009Dennis Hunt, Gencor Industries, Inc.

Intelligent Compaction

CUPGA 2009Dennis Hunt, Gencor Industries, Inc.

Better Temperature Control

Thank you

CUPGA 2009Dennis Hunt, Gencor Industries, Inc.