Construction
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Flexible Pavement Production

Production of asphalt mixes for flexible pavements involves blending and heating predetermined proportions of aggregate and asphalt binder.

Figure 3: Drum Plant

HMA Manufacturing

HMA is produced in a plant that proportions, blends, and heats aggregate and asphalt to produce an HMA that conforming to job mix formula (JMF) requirements. There are two basic types of HMA plants commonly in use today: the batch plant, and the drum plant. Batch plants produce HMA in individual batches while drum plants … Read more »

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HMA Plant Operations

HMA production is the first step in construction. The basic purpose of an HMA plant is to properly proportion, blend, and heat aggregate and asphalt to produce an HMA that meets the requirements of the job mix formula (JMF) (Roberts et al., 1996). There are two basic types of HMA plants commonly in use today: … Read more »

Figure 2. Infrared view of a drum mix plant.

HMA Drum Plant

Drum plants, which produce HMA in a continuous manner, generally offer higher production rates than batch plants for comparable cost. Typical production rates for drum plants vary between about 100 tons/hr up to over 900 tons/hr depending upon drum design. Figure 1 shows the basic components of a drum plant and their functions.   Burner … Read more »

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HMA Batch Plant

Batch plants, which produce HMA in individual batches, are the older of the two types of HMA production facilities. HMA was originally made in batches; it was not until the 1970s that drum plants became a popular HMA production option. Currently about 70 percent of all operational HMA plants in the U.S. are batch plants … Read more »