Common Cold Asphalt Equipment

• Posted by Mavis Chai May 10, 2025 Filed in Technology #construction machinery  #cold asphalt plant  63 views
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  The following is a detailed description of the main equipment required for the production of Cold Mix Asphalt (CMA), as well as its functions and technical characteristics, classified and sorted according to the production process flow. For more equipment for construction, you're recommended to visit lutonmachinery.com.

  Raw Material Pretreatment Equipment

   1. Aggregate crushing screening system

  - Function : Crush the raw materials (new aggregates or recycled asphalt RAP) to the required particle size and grade them.

  - Key equipment 

  - Jaw crusher : Coarse crushing of large aggregates (particle size ≤100mm).

  - Impact crusher/Cone crusher : Fine crushing to the target gradation (such as 0-10mm).

  - Vibrating Screen : Multi-stage screens (such as 4-layer screens) separate aggregates of different particle sizes.

  - Technical Parameters :

  Processing capacity: 20 to 200 tons per hour (depending on the scale of the production line);

  - Screening accuracy: ±2mm gradation error.

   

  2. Aggregate drying equipment

  - Applicable scenarios : Solvent-based cold materials or emulsified asphalt-based cold materials produced in areas with high humidity.

  - Device type :

  - Drum Dryer (Low-temperature type) : Working temperature ≤80℃ to prevent overheating of aggregates;

  - Solar Drying Chamber : Environmentally friendly and energy-saving, suitable for areas with abundant sunlight.

  - Control Points  : The moisture content of the aggregate is ≤3%.

  Emulsified Asphalt Production Equipment (for emulsified asphalt-based cold materials)

  1. Emulsified asphalt preparation system 

  Core equipment :

  - Colloid mill : High-speed shearing (3000-4000rpm) to mix and emulsify asphalt with the aqueous phase (emulsifier + water);

  - Asphalt heating tank : Heat the asphalt to 120-140℃ (maintain fluidity);

  - Aqueous phase mixing tank : Dissolves emulsifiers, stabilizers and other additives.

  - Technical Parameters :

  Emulsified asphalt output: 5 to 30 tons per hour;

  - Asphalt particle size: 1 to 5μm (stability is crucial).

   

  Mixing and Stirring System

   1. Cold mixer

  - Function: Evenly mix aggregates, emulsified asphalt/diluted asphalt and additives.

  - Device type :

  - Double-shaft forced mixer :

  - High stirring intensity, suitable for emulsifying asphalt-based cold materials (coating rate ≥90%);

  The rotational speed is 20 to 30 RPM and the stirring time is 3 to 5 minutes.

  - Continuous mixer :

  It is suitable for large-scale production (such as recycled cold materials), with a production capacity of 50 to 200 tons per hour.

  Equipped with a dynamic weighing system, with an accuracy of ±0.5%.

   

  2. Additive metering device

  Type:

  -Screw conveyor : Used for powder additives such as cement and fibers;

  - Liquid metering pump : Precisely inject liquid additives such as emulsifiers and anti-stripping agents.

  - Accuracy requirement : ±1% measurement error.

   

  Special Equipment for Solvent-based Cold Materials

  1. Solvent dilution system

  - Equipment composition :

  - Asphalt-solvent mixing tank : With heating interlayer (temperature control 120-140℃) and agitator;

  - Solvent Storage tank : Explosion-proof design, equipped with nitrogen protection (anti-evaporation).

  - Safety Requirements : ATEX explosion-proof certification, static grounding.

   

  2. VOCs Recovery device

  - Function: Collect and process volatile organic compounds (such as kerosene, diesel solvents).

  - Device type:

  - Activated Carbon Adsorption Tower: Adsorption efficiency ≥90%;

  - Condensation Recovery System : Suitable for the recovery of high-concentration solvents.

   

   Recycled Cold Material Production Equipment

  1. RAP processing line

  - Equipment

  - Crusher: Crush the old asphalt blocks to ≤20mm;

  - Magnetic separator : Separates metal impurities such as steel bars;

  - RAP preheater : Indirectly heated to 40-60℃ (to enhance the penetration of the regenerant).

   

  2. Regenerant spraying system

  - Equipment 

  -  High-pressure atomizing nozzle: Evenly spray regenerant (coverage rate ≥95%);

  -Temperature-controlled storage tank: Maintain the fluidity of the regenerant (such as heating aromatic oil to 50℃).

   

  Finished Product Storage and Packaging Equipment

  1. Finished Goods warehouse

  Type :

  - Sealed storage hopper: Moisture-proof design, suitable for emulsified asphalt-based cold materials;

  - Anti-volatilization Storage tank: Equipped with a breather valve, used for the temporary storage of solvent-based cold materials.

  2. Packaging system

  - Equipment

  -Ton bag packaging machine: 1-1.5 tons per bag, suitable for bulk transportation;

  - Small Bag Automatic Filling machine: 25kg per bag, convenient for manual handling.

   

  Auxiliary and Control System

  1. Automation Control Center

  - Function:

  Real-time monitoring of parameters such as aggregate gradation, additive ratio, and stirring time;

  Fault alarm and production data recording (supporting ISO quality management).

  - Hardware: PLC controller + HMI human-machine interface.

  2. Environmental treatment equipment

  Type:

  - Dust Collector: Bag filter (for handling stirring dust, emission ≤20mg/m³);

  - Wastewater Treatment System : Recover cleaning wastewater (emulsified asphalt production line).  

   

  Reference Table for Equipment Selection

  Production Type	Core Equipment Portfolio	Production Capacity Range	Investment Estimate (RMB)
  Emulsified asphalt-based cold material	Double-shaft mixer + emulsified asphalt system + ton bag packaging machine	10-50 tons per hour	800,000-3 million
  Solvent-based cold material	Solvent mixing tank + explosion-proof mixer + VOCs recovery device	5-30 tons per hour	1.2 million - 5 million
  Regenerated cold material	RAP crushing line + regenerant spraying system + Continuous mixer	20-100 tons per hour	2 million - 8 million

   

  IX. Equipment Development Trends

  1. Modular design: Containerized production line, rapid deployment (such as mobile repair cold material production vehicle);

  2. Intelligent Upgrade: AI visual inspection of aggregate gradation and automatic adjustment of the ratio;

  3. Zero Emission Technology: Fully enclosed solvent recovery, with VOCs emissions approaching zero.

   

  Conclusion

  Cold asphalt material production equipment should be according to the material type (emulsion/solvent/regeneration), scale of production and  flexible matching environmental protection requirements.

  For small-scale repair projects, simple mixers (5 to 10 tons per hour) can be used, while for large-scale projects, fully automatic production lines (including integrated crushing, mixing and packaging) need to be equipped. The technical key of the core equipment lies in the control of mixing uniformity and the design of environmental protection compliance.

  In the future, it will be deeply integrated in the direction of greenness and intelligence.