Hot Mix Asphalt Plant

In recent 20 years, with the rapid development of highway transportation in China, highway mechanized construction has made great progress. Asphalt mixture mixing equipment has become one of the essential mechanical tools for high-grade highway project in China. As a matter of fact, the asphalt mixture mixing equipment refers to the asphalt mixing plant or hot mix asphalt plant.

Brief Introduction of A Hot Mix Asphalt Plant

A hot mix asphalt plant is designed to mix aggregates of different particle size and fillers (mineral powders) according to a certain proportion to produce the asphalt mixture with the effect of binder (asphalt or residual oil) at a specified temperature.

A hot mix asphalt plant has another name — asphalt mixing plant, which can produce asphalt mixture, modified asphalt mixture and colored asphalt mixture, and has been playing a significant role in these construction projects such as motorway, grade highway, urban road, airport and port.

The main raw materials of hot mix asphalt plant include asphalt, stone, fly ash, etc. It has the following characteristics: fireproofing, waterproofing and noise reduction.

Hot mix asphalt plant

How does an Asphalt Plant Work

After the central control room sends the boot command, the cold materials in the cold bin are first transported to the drum dryer through the belt conveyor. Then the aggregates dried are transported to the vibrating screen for screening via the hot material elevator, and the screened aggregates fall into each hot aggregate bin.

Next The powders and screened aggregates drop into the corresponding weighing hopper from the outlet of the respective storage bins, are measured by the electronic scale, and are dropped into the mixing tank. Last the weighed hot asphalt is also sprayed into the mixing tank.

After various mixtures are fully mixed, the finished asphalt mixture is produced and it’s unloaded into the hopper car. It is unloaded into the asphalt mixture storage bin through the track, and finally the finished materials are placed on the transport vehicle through the unloading gate.

working process of asphalt batching plant

How Hot Mix Asphalt is Manufactured

The cold sand and stone materials of different specification are sent to the drying drum for drying and heating by the cold aggregate belt conveyor after the initial batching by the cold aggregate storage and batching device, and then sent to the vibrating screen by the hot aggregate elevator for secondary screening.

Diverse screened sand and stone materials are respectively stored in the compartment of the hot storage bin, and then enter the hot aggregate weighing hopper for weighing and measurement according to the specified proportion.

The hot mix asphalt stored in the insulation tank is pumped to the asphalt weighing barrel for weighing and metering by the asphalt delivery pump through the insulated asphalt pipeline; the weighed hot asphalt, together with the powder measured according to a certain proportion, is put into the mixer and forced to mix according to the sequence set by the program.

Hot Mix Asphalt Plant for Road Construction

The hot mix asphalt plant is the plant used for quantity production of the asphalt mixture. There are two common types of asphalt mixture, including asphalt concrete and asphalt macadam. Asphalt concrete contains the mineral powder while the asphalt macadam doesn’t contain the mineral powder.

Asphalt is a widely used cementitious material for pavement structure in road construction. It can be mixed with mineral materials with different composition in proportion to build asphalt pavement of different structure such as motorway, grade highway and urban road.The hot mix asphalt plant for road construction is hot sale in Luton machinery.

Hot Mix Plant Price

The price of an asphalt mixing plant is to be influenced by these factors such as the asphalt plant types, production capacity, finished material bin types, burner types and so on. The following is the range of price for the asphalt plants available for purchase.

The price of asphalt batching mixing plant ranges from $200,000 to $5,000,000.

The price of asphalt drum mixing plant ranges from $100,000 to $3,000,000.

The price of mobile asphalt mixing plant ranges from $150,000 to $3,500,000.

Hot mix asphalt plant

Mobile Hot Mix Plant

The mobile hot mix plant refers to the plant which is mounted on a trailer frame and can be transferred based on the different construction sites. It is suitable for these projects such as the county-rural roads, low grade highways, road maintenance and mountainous highway.

Batch Type Hot Mix Plant

Batch hot mix plant is the main supporting equipment for asphalt pavement construction. Because of its perfect structural characteristics, correct gradation, high measurement accuracy, good quality of finished materials and simple control, it has played an important role in the construction of asphalt pavement, especially expressway.

Structure of the Batch Type Hot Mix Plant

The batch type hot mix plant consists of these following components: cold aggregate supply system, drying drum, combustion system, hot aggregate elevator, vibrating screening system, hot aggregate storage bin, metering system, mixer, filler feeding system, dust removal system, finished material bin and electrical control system.

stationary asphalt mixing plant parts

Technical Requirements of the Batch Type Hot Mix Plant

>Cold aggregate supply system

The cold material supply system undertakes the tasks of feeding and primary distribution. It is generally required to be equipped with 4 ~ 6 bins, one of which is a sand bin. The number of bins can also be increased or decreased according to the needs of users.

aggregate batching machine

The opening width and height of the cold aggregate bin must be convenient for the loader to load. And the lower part of the bin is usually equipped with a belt feeder.

An adjustable material door is installed at the outlet of the cold aggregate bin, and the feeding amount can be adjusted through the change of the opening degree of the material door and the rotating speed of the belt conveyor. The feeding amount must be even and stable during the operation progress.

The correctness of aggregate supply and primary bitching directly affects the quality of the asphalt mixture.

>Drying Drum

When designing the drying drum, it is required to have sufficient volume and a certain length diameter ratio. The materials in the drum are lifted, dropped and moved forward under the action of drum blades, and heated under the effect of flame and combustion hot air flow.

Dry durm

The combustion hot air flows through the aggregate curtain in the drum for heat exchange, and the water in the aggregate volatilizes continuously and increases the temperature of the aggregate.

The all information described above presents the hot mix asphalt plant. For additional details, please contact Luton Group.

Hopper Capacity4×4.5m³4×6.5m³4×7.5m³4×7.5m³4×7.5m³5×12m³5×12m³
Collect Belt Capacity60t/h80t/h100t/h120t/h140t/h200t/h220t/h
Dryer Sizeφ1.2m×5.2mφ1.5m×6mφ1.5m×6.7mφ1.65m×7mφ1.8m×8mφ2.2m×9mφ2.6m×9m
Dryer Capacity60t/h80t/h100t/h120t/h140t/h180t/h240t/h
Vibrating Screen4 layer4 layer4 layer4 layer4 layer5 layer5 layer
Aggregate Metering hopper500kg800kg1000kg1300kg1500kg2000kg2500kg
Mineral Flour Metering Hopper120kg150kg200kg200kg300kg300kg320kg
Mixer Capacity500kg800kg1000kg1250kg1500kg2000kg2500kg
Cycle Time45s45s45s45s45s45s45s

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