The application skills of asphalt cold patch in road repair are crucial for ensuring repair quality and extending road service life. The following systematically summarizes these application tips from four aspects: construction preparation, operating procedures, quality control, and precautions:
1. Construction Preparation
Damage Assessment and Cleaning
Precisely Locate Defects: Use an infrared thermal imager or 3D road scanner to identify the depth and extent of defects such as cracks and potholes.
Thoroughly Clean the Base: Use high-pressure air or a water jet to remove loose particles, dust, and accumulated water from potholes to ensure the base is dry and solid.
Special Case Handling: For damp or high-water-content bases, spray a small amount of emulsified asphalt as a bonding layer to enhance adhesion.
Material and Equipment Preparation
Material Selection: Prefer cold patch materials with a high anti-stripping agent content and good low-temperature ductility to ensure they maintain their performance in temperatures between -30°C and 50°C.
Equipment Inspection: Ensure that compaction equipment (such as plate vibratory tamper and small roller) is in good condition to avoid equipment failures that could affect construction efficiency.

II. Operational Specifications
Filling and Compaction
Layered Filling: Each layer of filler should be 3-5 cm thick to avoid uneven compaction caused by excessive filling at once.
Compaction Technique: Use static compaction followed by vibration compaction. Check the compaction level after each layer to ensure it reaches at least 95%.
Edge Treatment: Trim the edges of the patch area to create a vertical slope and enhance the adhesion between the new and existing pavement.
Joint and Flatness Control
Joint Treatment: Apply emulsified asphalt to the joints between the patch and the existing pavement to form a bonding layer and prevent moisture infiltration.
Smoothness Adjustment: Use a 3-meter ruler to check the smoothness of the patch area, maintaining an error within ±3 mm to ensure driving comfort.
III. Quality Control
Material Performance Testing
Adhesion Test: Use a water boiling method or pull-off test to ensure that the cold patch material adheres to the stone at a minimum level 4. High-Temperature Stability: A wheel rutting test is used to evaluate the dynamic stability of the cold patch material at 60°C, ensuring a minimum of 3,000 cycles/mm.
Construction Process Monitoring
Compaction Testing: A nuclear density meter or sand injection method is used to monitor compaction in real time to ensure the quality of each layer.
Thickness Control: The thickness of the patch layer is measured using core drilling or geological radar, with an error limit of ±5%.
IV. Precautions
Environment and Safety
Temperature Control: When working in extremely low-temperature environments, the cold patch material may be preheated (no higher than 50°C), but heating should be avoided to prevent degradation of the material's properties.
Safety Precautions: Construction workers must wear protective masks and gloves to avoid skin contact and inhalation of dust.
Post-Maintenance
Initial Maintenance: After the repair is completed, heavy vehicles are prohibited from passing through the repaired area for 24 hours to prevent damage.
Long-Term Monitoring: Regularly inspect the repaired area for flatness and crack development, and perform secondary repairs promptly.