I. Definition and Classification

Definition: Asphalt powder is a finely divided powdered material processed from asphalt through physical or chemical methods.

Category:

1. By raw material origin:

• Processed from coal tar, it contains a high content of resin and asphaltene.
• Petroleum asphalt powder: Processed from petroleum distillation residues, it boasts excellent stability and weather resistance.

1. By processing method:

• Spray Drying Method: The molten asphalt is atomized and dried into powder through a spray tower.
• Cold crushing method: The asphalt is cooled and solidified, then mechanically crushed into powder.

1. By particle size:

• Fine powder: Particle size less than 100 mesh.
• Coarse powder: Particle size between 100 mesh and 200 mesh.

II. Production Process

The production process of asphalt powder mainly includes the following steps:

1. Raw Material Selection: Coal tar or petroleum distillate residue is used as the raw material.
2. Pre-treatment: Heat, degasify, and filter raw materials to remove impurities.
3. Processed and shaped:

• Spray Drying: Melting asphalt is atomized through a high-pressure nozzle and rapidly dried into powder in hot air.
• Chilled Crushing: Coarsely crush asphalt to a powder by cooling it to a脆ification temperature and mechanically crushing it.

1. Sifting and Grading: Sift the powder to obtain products with different particle sizes.
2. Packaging and Storage: Powder should be filled into bags or stored in sealed containers.

III. Performance Features

Bitumen powder boasts the following performance characteristics:

1. Excellent bonding property: Strongly bonds with aggregates, fibers, and other materials, enhancing the overall performance of the material.
2. Excellent waterproofing: Forms a dense waterproof barrier, preventing moisture penetration.
3. Excellent weather resistance: Good tolerance to environmental factors such as ultraviolet rays and oxidation.
4. Ease of construction: Powder form is easy to store, transport, and apply, and can be used by spraying or stirring methods.
5. Modifiability: Can add modifiers such as polymers, rubber powder, etc., to enhance performance.

Section 4: Application Fields

Asphalt powder finds wide application in various fields:

1. Road Engineering:

• Cold Mix Asphalt: Mixed with aggregates and water to produce cold mix asphalt, used for road repairs and maintenance.
• Emulsified Asphalt: Used as raw material for emulsified asphalt, suitable for slurry seals, priming oils, and more.

1. Waterproof materials:

• Waterproof Coating: Mixed with water and emulsions to produce waterproof coatings, used for roof, basement, etc., for waterproofing purposes.
• Waterproof Membrane Adhesive: Enhances waterproofing performance as an additive for waterproof membranes.

1. Building Adhesive:

• Tile Adhesive Additive: Enhances the bonding strength of tile adhesives.
• Sealant Materials: Used for sealing building gaps to prevent leakage.

1. Industrial Corrosion Protection

• Pipe Anticorrosion: Raw material for anticorrosion coatings, used for the anticorrosion treatment of pipes and tanks.
• Equipment Corrosion Protection: Used for the corrosion protection of machinery and equipment, bridges, and other structures.

1. Carbon materials:

• Carbon Products: As a binder for carbon products, enhances the mechanical strength of the items.

V. Technical Specifications Reference

The following are typical technical specifications for asphalt powder:

Particle Size (Mesh) 80-300 indicates the fineness of the powder; Softening Point (°C) 70-150 reflects the high-temperature stability of asphalt; Ash Content (%) ≤1.0 indicates the amount of impurities; Volatile Content (%) ≤5.0 reflects the content of light components; Adhesive Strength (MPa) ≥0.5 indicates the adhesive property.