What Is Asphalt Plant?


Asphalt plant is a set of equipment used to blend aggregates and bitumen to produce asphalt mix. Mineral fillers and additives may be required to add to the mixing process in some cases. The asphalt mix can be widely applied for the pavement of highways, municipal roads, parking lots, airport expressway, etc.

What Are The Types Of Asphalt Plants?

There are usually four types of asphalt plants, batch mix, drum mix, mobile/portable, and recycling.

1. Asphalt Batch Mix Plant

There is a time interval between two mixing batches due to the mixer, so it's also known as the discontinuous or intermittent type.

2. Asphalt Drum Mix Plant

It's often called continuous type. With the drying drum enjoying the mixing function synchronously, the type of paving material manufacturing equipment makes the required mixture continuously.

3. Mobile Asphalt Plant

Also named portable type, featuring modular structure design, mobile ones boast prominent mobility performance, and can achieve fast relocation and reassembly.

4. Asphalt Recycling Plant

By using hot recycling technology, this type of mixer is able to recycle reclaimed asphalt pavement (RAP) and produce a newly finished mixture with good quality.

It's actually the different mixing modes that decide what type a mixing equipment is categorized into. While both of them can be distinguished clearly from each other by observing their producing process, or even apparently by observing the appearance, they both can fulfill the purpose of producing hot mix asphalt (Abbreviated as HMA).

How Does An Asphalt Plant Work?

It is utilized to heat, dry cold aggregates, and blend them with bitumen, RAP, and other binders as per diverse recipes to produce different final mixtures for road surface paving. Now that there are two basic types of HMA manufacturing facilities, two different working principles are existing correspondingly.

How Does An Asphalt Batch Plant Work?

structural schematic diagram of asphalt batch mix plant
Structural Diagram of HMA Batch Mixer
3D Simulation Video of A Batching HMA Mixer

Asphalt batching plant is a set of equipment that produces final mixture batch by batch and characterized by intermittent pauses between batches. Due to the accurate weighing system for dosing the aggregates, bitumen, and other admixtures, the products of it are of high quality.

The Working Principle Of Asphalt Batch Plants

1. Feed cold aggregates into different bins according to the particle size.
2. The collection conveyor belt below bins and an inclined conveyor belt successively transfer them to the drying drum.
3. After dried, the hot materials come out and enters the elevator, which transports them up to the screening system.
4. The hot aggregates get separated by multiple-layer vibrating screens.
5. They enter into temporary storage bins, the number of which is equal to that of screens.
6. They are released to the mixer below in accordance with the dosing weights set on the control panel.
7. Simultaneously, bitumen and optional mineral fillers are also weighed and released into the mixer.
8. After mixed for less than 20 seconds, the final mix is discharged into the waiting truck or the special storage silo.

process flow chart of asphalt batching plant
Flow Chart Of Intermittent Hot Mix Station

By the way, one whole batch usually takes about 45 seconds, beginning from hot aggregate weighing, and ending with discharging action is completed.

In most cases, the batch mix factories come with baghouse dust filters. And the dust generated during the whole process could be captured. It can also be reintroduced into the bucket elevator.

How Does An Asphalt Drum Plant Work?

structural schematic diagram of asphalt drum mix plant
Structural Diagram of Continuious HMA Mixing Factory
Video of A Continuous Mixing Station

Asphalt drum mix plant is a facility that is featured with a continuous paving material manufacturing process without the interval pauses. It's more time-saving and efficient, so compared with its counterpart, the lower-cost equipment will be an ideal choice if the quality standard of asphalt mix is not too high.

As opposed to batch mix type, the continuous one does not have a mixer, and the drying drum, no matter it's a parallel-flow drum or counter-flow drum, performs the dual functions of drying and mixing. The first half of the multiple-function drum is for heating the cold materials, while the second half is for the heated aggregates to mix with bitumen and the optional admixture.

The Working Principle Of Asphalt Drum Plants

1. Cold aggregates are fed into different bins according to the particle size.
2. The collection conveyor belt below bins and an inclined conveyor belt successively transfer them to the drying drum.
3. Cold aggregates are heated and dried in the first half of the parallel-flow or counter-flow drying drum.
4. The heated aggregates get blended with bitumen and the optional admixture in the other half of the parallel-flow or counter-flow drying drum.
5. The final mix is discharged into the waiting truck or the special storage silo.

process flow chart of asphalt drumming plant
Flow Chart Of Continuous Hot Mix Facility

Due to the continuous production property, to avoid downtime caused by the excessive final mix that is not delivered offsite immediately, a small temporary storage bin is sometimes a must. To control pollution, the drumming equipment is often equipped with water dust filters or baghouse collectors.

What Benefits Can Mobile Asphalt Plants Bring?

Drying Drum Moving Unit
Drying Drum Moving Unit
Bitumen Tank + Control Room Moving Unit
Bitumen Tank&Control Room Moving Unit
Baghouse Dust Filter Moving Unit
Baghouse Dust Filter Moving Unit
Cold Aggregate Feeding System Moving Unit
Aggregate Feeding System Moving Unit

Mobile asphalt plant is a batching or continuous asphalt producing equipment that has its mobility performance improved by being designed to be more compact and mounted with the automobile chassis. It is an ideal facility to carry out small- or medium-scale road construction projects, especially those requiring the equipment to move from one place to another frequently.

That is to say, the portable feature allows you to carry the mobile mixing factory along with your bandwagon wherever you go for the next project.

The Advantages Of Mobile Asphalt Plants

1. Compact structure leads to less land footprint, also making it capable to be placed in a narrow or confined area.
2. Highly mobile, convenient for transportation and relocation due to four main modules, and each with a mobile chassis.
3. Ease of reinstallation, and can restart production with less trouble to handle.
4. Especially applicable to those projects demanding the plant to move frequently.
5. Low initial investment and highly cost-effective.

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