Asphalt Plant And Its Working

An Asphalt Plant is a machine designed to produce hot-mixed asphalt which is used in Road Paving in the whole Road Making Process. Asphalt is a vital material used in nearly every type of highway construction and maintenance. There are two types of Asphalt Plant- Batch Plant and Drum Mix Plant. Temperature and transportation highly affects the process of manufacturing asphalt for roads. Given is a list of all components of an Asphalt Plant along with their roles in the entire process of Asphalt Production.

Cold Aggregate Silo
In the initial stage, Dry Aggregates are fed in to the Cold Aggregate silo, and these Cold Aggregate silo are connected to Drying Drum with a conveyor belt. Also known as Aggregate bins or cold feed bins . Small plants can use only one bin but larger plants can use 4 or even 5 bins. Depending on the type of asphalt required on each contract the plant operator will need 3,4 or more different sizes of aggregates and each aggregate needs to be in the exact proportion on the final product. That is why each bin should be fit with a variable speed feeder that is controlled by the computer of the plant and delivers the exact amount of material from each bin for an exact mix as per job specifications.

Drying Drum
In the Drying Drum, the aggregates are dried by direct fire burner up to a specific temperature. Depending on the moisture present on the aggregates the plant will need more time for drying the material and this will reduce the output of the plant .  The Drying Drum rotates the aggregates several times and the dust generated needs to be controlled to avoid pollution . Some plants that mix on the same drum will use the last third of the length to inject the liquid asphalt to produce the final mix .

Metering and Mixing System
The aggregates have to be at the right proportions for the  mixing process, same as the liquid asphalt. This critical balance of the asphalt components is controlled by a precise computer system that controls each of the proportions for every size of aggregate and liquid asphalt involved in the mix.

Dust Cleaning System
Usually the pollution control system involves a dust gravity collector, bag house or wet scrubber.
Basically there is a dry pollution control system and a wet pollution control system, both are very effective and plant owners select one or the other depending many factors among them local government regulations .

Filler System
The fines collected by the dust bag collector can be sent to the recovery filler feeding system for storage and later use on the mix. The fines are transported with the help of a Conveyer belt.

Load out Conveyor or Drag Slat
Lifts  the finished asphalt mix onto the trucks or up to a Storage Silo. The ideal conveyor is closed one made out of steel to protect the mix from the environment and avoid loosing temperature during the loading of the trucks .

Scale or Weighting System
After the mixing, materials is sent to material handling dumping truck there needs to be a control of total amount of material leaving the plant site on the trucks. For that there are two main components to control amount of production . One is the same computer on modern plants it can produce a good report of material produced by the plant per hour or day  , and for individual trucks loaded with asphalt mix the best way have control is with scale. Usually the truck coming into the facility is weighted empty and then after loading the asphalt mix into the dump it is weighted again so there is an exact read out of the actual tones of materials delivered.

DMI Asphalt Equipment LLC is leading manufacturer and distributor of Asphalt Equipment in USA. DMI Asphalt Equipment LLC is a renowned exporter of Crushing Equipment across the world. The company has received wide recognition for its various products like New & Used Asphalt Plants, Asphalt Lab Equipment, DMI Asphalt Plants and Oil Heaters. All the offerings are of supreme quality. For more information please log on to

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