Asphalt concrete is made of asphalt, aggregates, and mineral powder. Aggregates account for about 90% of the mixture. Therefore, a stable and efficient asphalt aggregate production line plays an important role in road quality and project cost.
Quality standards for asphalt aggregates:
- Cubic particle shape: low content of flaky particles
- Accurate gradation: clear particle size distribution
- Clean and dry: low mud and dust content
- High hardness: good wear resistance and compressive strength
Suitable materials: granite, basalt, limestone, diabase, and other hard rocks.
To ensure stable gradation of asphalt mixtures, the production line usually needs to supply aggregates of different sizes.
| Aggregate type | Common size |
| Manufactured sand | 0–5 mm |
| Small gravel | 5–10 mm |
| Medium gravel | 10–20 mm |
| Large gravel | 16–31.5 mm |
Asphalt concrete production process (step-by-step)
An efficient asphalt aggregate production line includes several stages: feeding – crushing – shaping – screening – drying.
1. Raw material feeding and primary crushing
Large raw stones are fed evenly into a jaw crusher through a vibrating feeder. The jaw crusher performs primary crushing and prepares the material for secondary crushing.
The jaw crusher has a large feed opening and strong crushing capacity. It can crush stones of about 1 meter into medium size particles (usually 80–150 mm).
For hard rocks such as basalt or granite, a high-wear-resistant jaw crusher is recommended. It provides stable output, low failure rate, and long service life. Get Your Solution
2. Secondary crushing and shaping
After primary crushing, the stones are still too large and have sharp edges. They are sent to a cone crusher or impact crusher for further crushing and shaping.
- Cone crusher: suitable for medium and hard rocks (such as basalt used for asphalt). It offers high crushing ratio and uniform particle size.
- Impact crusher: suitable for medium-soft stones. It uses impact force to produce more rounded particles.
At this stage, the material is usually crushed to about 30–50 mm for further processing. Get Your Solution
3. Sand making and shaping
In this stage, the material undergoes impact shaping through "stone-on-stone" or "stone-on-iron" crushing.
A vertical shaft impact crusher (sand making machine) is used to produce 0–5 mm manufactured sand. It also improves the particle shape, making the aggregates closer to cubic shape. Get Your Solution
4. Screening and product grading
The crushed materials are sent to a multi-layer vibrating screen for grading. The screen separates different sizes of aggregates, such as: 5–10 mm, 10–20 mm, 16–31.5 mm.
Materials that do not meet the required size will return to the crushing system for reprocessing.
5. Aggregate drying and asphalt mixing
Screened aggregates usually contain natural moisture. They need to be dried in a rotary dryer at about 160–180°C. This step removes moisture and preheats the aggregates. It prevents water from affecting the bonding between asphalt and aggregates.
After drying, the aggregates enter the asphalt mixing plant. They are mixed with heated asphalt, mineral powder, and additives to produce asphalt concrete mixture.
The finished mixture is then transported to the construction site for paving.
How to install an asphalt driveway?
After the asphalt mixture is produced at the asphalt mixing plant, it is transported to the construction site for paving. First, the ground is cleaned and leveled to form a stable base. A compacted gravel or crushed stone layer is then installed as the foundation.
Next, the hot asphalt mixture is spread evenly using paving equipment and compacted with road rollers. Proper compaction improves the density and strength of the pavement. After cooling and curing, the asphalt surface becomes strong enough for traffic.
A high-quality asphalt mixture and proper compaction help create a smooth and durable driveway.
Why should asphalt plants pay attention to the aggregate production line?
Aggregate quality directly affects the performance and service life of asphalt pavement.
- Unqualified aggregates → weak asphalt bonding → cracks, potholes, and rutting
- Poor particle shape → difficult compaction → uneven pavement
- Unstable gradation → batch variation → higher repair costs
Therefore, a stable asphalt aggregate crushing production line ensures a long-term supply of high-quality aggregates.
Which solution is suitable for your project?
We can provide customized asphalt aggregate production line solutions for different needs:
- New asphalt mixing plant: A high-standard aggregate production line with a capacity of 50–500 tons per hour is required to supply aggregates for drying and mixing.
- Production line upgrade: Adding a sand making machine or optimizing crushing equipment can improve aggregate gradation.
- Stone quarry expansion: The crushing process can be optimized for different rocks (such as basalt or limestone) to produce high-quality asphalt aggregates.
Want to know the right asphalt aggregate production line or equipment price for your project? Get a Quote Just tell us your raw material type, target capacity, and product size. Our engineers will provide a free production line design solution for you.
