Definition of Aggregate and Equipment Used for Aggregate Processing

With the acceleration of national development and construction, sand and gravel aggregates have become the second largest consumable. The construction of high-speed railways, highways extending in all directions, and rows of high-rise buildings across the country requires a large amount of sand and gravel aggregates. So what exactly is aggregate?
construction aggregate

Definition of Aggregate

Aggregate is one of the three main components of concrete. Aggregate plays the role of filling and supporting in concrete. Concrete added with aggregate is more durable, stable and stronger.

  1. According to the source, it is divided into natural, artificial and regenerated aggregates;
  2. In the light of the particle size, it is divided into coarse aggregate and fine aggregate; the particle size between 0.15-4.75mm is divided into fine aggregate, which is what we usually call sand; the particle size between 4.75-9.0mm is divided into It is coarse aggregate, commonly known as gravel.
  3. On the basis of density, it is divided into ordinary aggregate and light aggregate.

0.15-4.75mm sand aggregate
0.15-4.75mm sand aggregate
5-10mm aggregate
5-10mm aggregate
10-40mm aggregate
10-40mm aggregate

As natural sand and gravel aggregates are gradually depleted, the market for artificial sand and gravel is relatively hot. Aggregate production lines can be formed through some crushing equipment to process slag, rocks, waste, etc. into the required particle size of construction aggregate.

Composition of Aggregate Production Line

The aggregate production line is usually composed of stone crushing equipment and sand making equipment.

Stone Crushing Equipment

The crushing equipment is specially used to process large pieces of stones to the particle size of about 50mm. Depending on the hardness, brittleness, density, and humidity of the ore, different types of crushing equipment can be selected. Common ones include jaw crushers, cone crushers, impact crushers, etc.
aggregate crusher

Primary Crushing Equipment – Jaw Crusher

The jaw crusher squeezes and crushes the materials through the up and down movement of the jaw plates to complete the crushing operation. The material is placed between the jaw plates. With the periodic movement of the jaw plates, the material is crushed by pressure and extrusion. The crushed materials are discharged through the discharge port. Jaw crusher, with its simple and reliable working principle, is widely used in the mining and construction industries to process stones and ores of various hardnesses.

Jaw Crusher
Jaw Crusher

Second Crushing Equipment – Cone Crusher/Impact Crusher

In the secondary crushing stage, commonly used equipment include cone crushers and impact crushers.

  • Cone Crusher: The cone crusher squeezes, impacts and crushes the materials through the cone-shaped crushing chamber. The gap between the conical head and the crusher casing gradually becomes smaller, so that the material is gradually crushed while being squeezed and collided. Adjusting the discharge port of the crusher can control the particle size of the finished product
  • Impact Crusher: The impact crusher collides with the material through the high-speed rotating rotor, causing it to be crushed by the impact force. The rotor has the characteristics of high-speed rotation and swing during movement, so that the material is gradually broken into the required particle size during the collision process. Impact crushers are suitable for processing medium hard stones and ores.
  • Differences Between Cone Crusher and Impact Crusher: As the secondary crushing equipment, the cone crusher pays more attention to extrusion and crushing, and is suitable for scenarios that require better product shape, while the impact crusher focuses on efficient impact force and is suitable for situations where the product shape requirements are relatively loose. Selection should be based on specific project requirements and material characteristics.

cone crusher
Cone Crusher
Impact-type Aggregate Crusher
Impact Crusher

Sand Making Equipment

Common sand making equipment include vertical shaft impact sand making machine, and VSI sand making machine, etc. Sand making equipment can process gravel with a particle size between 35-60mm into 0-4.65mm sand that meets specific requirements through process steps such as crushing, grinding and screening.

sand making machine
Sand Making Machine

Common Configuration of Aggregate Production Lines

Generally speaking, the configuration of the aggregate stone crusher plants needs to be combined with the user’s working conditions, time production, finished product particle size, energy consumption and other requirements. Common equipment combinations for the aggregate production line are:

  1. Feeder + jaw crusher + cone crusher + Screening machine
  2. Feeder + jaw crusher + impact crusher + Screening machine
  3. Feeder + jaw crusher + cone crusher + VSI sand making machine + Screening machine

Advantages of Finished Products Processed by Aggregate Production Lines

  • Has very good particle gradation and small porosity, which can save cement consumption.
  • With very stable physical and chemical properties and better durability.
  • Contains few impurities and will not affect the setting and hardening of cement, which can effectively extend the service life of engineering buildings.
  • The mechanically processed aggregate has higher hardness and sturdiness, and its erection effect is more obvious.

portable aggregate crushers
The careful selection of aggregates and the application of advanced aggregate production lines provide a solid foundation for construction projects. Along the way, aggregates will continue to play a key supporting role, creating strong and reliable structures for future buildings.

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