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Before rock aggregate is mixed with other ingredients to make HMA, it is thoroughly dried. The drying and mixing process can be accomplished with one piece of equipment or the functions can be separated. Mixing can take place in a continuous process or in a batch process. Astec supplies a complete line of high-performance drying and mixing equipment to fill the varying needs of producers worldwide. Astec also provides pugmill type mixers which premix additives with rock aggregate.
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Double Barrel® Dryer Drum Mixer |
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The Double Barrel® mixer uses a unique, energy-efficient system to dry aggregate and mix HMA. The Double Barrel's inner dryer drum rotates inside a stationary shell. Mixing paddles are attached to the outside of the dryer drum. As the dryer drum turns, it functions as the shaft of a large pug mill mixer. Read more... |
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The Double Barrel Green® System is an option that can be included with any new Astec Double Barrel drum mixer/dryer or added as a retrofit. The system uses water to produce a foamed warm mix asphalt that is odorless, smokeless and longer lasting. The Double Barrel Green System is a major break through in warm mix asphalt technology because it does not require the addition of expensive commercial additives. Read more... |
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The Double RAP dryer separates the drying process from the mixing process, thereby providing a very reliable plant to be used for the purpose of recycling reclaimed asphalt pavement (RAP). The concept allows for RAP to be pre-conditioned through the external part of the Double RAP dryer, flashing off moisture in the drum, thus eliminating the problems associated with scavenger systems. Read more... |
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Retrofitting an existing stationary plant with an Astec drum mix coaters (DMC) overcomes the problem many conventional mixers have with hydrocarbons and blue smoke. The coater does the mixing, leaving the drum mixer to function only as a dryer. Read more... |
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Parallel-Flow Drum Mixers |
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Astec's parallel-flow drum mixer is recommended where initial cost of the equipment is an overriding consideration. It is quite suitable for applications where air pollution codes are less restrictive and high percentages of RAP will not be used. Read more... |
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Astec aggregate dryers feature the same quality construction found on the Double Barrel®. Stationary dryers are used mainly with batch plant facilities. Along with a low pressure oil burner, these units come with the blower burner, automatic burner controls, burner platform, fuel oil pump and ignition platform. Read more... |
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The batch tower and hot elevator assembly includes a 3-1/2 deck screen, four hot bins, manual sampling system, aggregate weigh hopper, and liquid asphalt weigh bucket. Read more... |
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Astec offers the BGA batch tower series from Barber-Greene. These batch towers, now built by Astec, are smaller than the TS models and popular on the international market. Five different BGA towers are available with batch ratings from one to five tons in portable or stationary version. Read more... |
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Super Towers can have as many as 14 bins, providing an amazing 800 tons of hot aggregate storage. This can provide enough rock to run all day without having to replenish the bins. Read more... |
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Post Drum Mixers are powerful pugmill mixers which incorporate dried aggregate and liquid asphalt to make hot mix asphalt. They can be used as stand-alone units or in combination with a dryer. Read more... |
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Lime is often mixed with aggregate to achieve a stronger bond between the rocks and the liquid asphalt. Astec lime pugmills premix the lime and the aggregate before the aggregate enters the dryer. Read more... |
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Drying & Mixing
