Road repair and maintenance asphalt cold patch material is an efficient and convenient road repair material. The following is a detailed introduction:
1. Definition and composition
Asphalt cold patching material, also known as cold patching material, cold patching asphalt mixture or cold mix asphalt material, is a patching material composed of matrix asphalt, isolation agent, special additives and aggregates (such as gravel). These materials are mixed according to a certain proportion in professional asphalt mixing equipment to make "asphalt cold replenishing fluid", and then mixed with aggregates to finally make finished materials.
2. Features and advantages
Modified, not completely thermoplastic: Asphalt cold patch material is a modified asphalt mixture, which has the significant advantages of direct injection and high performance.
Good stability: At normal temperature, asphalt cold patch material is liquid and thick, with stable properties. It is the core raw material for cold patch production.
Wide range of application: It can be used between -30℃ and 50℃, and can be used all-weather. It is suitable for repairing various types of road surfaces in any weather and environment, such as asphalt, cement concrete roads, parking lots, airport runways, and bridges. Scenarios such as expansion joints, potholes on highways, national and provincial highways and municipal highways, community excavation and filling, pipeline backfilling, etc.
No heating required: Compared with hot mix, asphalt cold patch material can be used without heating, reducing energy consumption and emissions.
Easy to operate: When using, just pour the cold patching material into the pits and compact it with a shovel or compaction tool.
Excellent performance: Asphalt cold patch material has high adhesion and cohesion, can form an overall structure, and is not easy to peel and move.
Convenient storage: Unused asphalt cold patch material can be stored sealed for subsequent use.

3. Construction steps
Pot cleaning: Determine the location of the pit excavation, and mill or cut the surrounding areas. Clean the gravel and waste residue in and around the pit to be repaired until a solid and solid surface is seen. At the same time, there should be no mud, ice or other debris in the pit. When grooving, the principle of "square repair for round pits, straight repair for inclined pits, and combined repair for continuous pits" should be followed to ensure that the repaired pits have neat edges.
Brushing interface edge sealer/emulsified asphalt: Brush the interface agent/emulsified asphalt evenly on the facade and bottom around the cleaned pit, especially around the pit and the corners of the pit. The recommended amount is 0.5 kg per square meter to improve the fit between the new and old pavement and enhance the waterproof and water damage resistance of the pavement joints.
Fill the pit: Fill enough asphalt cold patch material into the pit until the filler is about 1.5 cm above the ground. When repairing municipal roads, the input of cold patch materials can be increased by about 10% or 20%. After filling, the center of the pit should be slightly higher than the surrounding road surface and in an arc shape. If the depth of the pit on the road surface is greater than 5 cm, it should be filled in layers and compacted layer by layer, with 3 to 5 cm per layer being appropriate.
Compaction: After paving evenly, select appropriate compaction tools and methods for compaction according to the actual environment, the size and depth of the repair area. For potholes with larger areas, a roller can be used for compaction; for potholes with smaller areas, an iron tamping machine can be used for compaction. After compaction, the repaired area should have a smooth, flat surface without wheel marks, and the surroundings and corners of the pit must be compacted and not loose. If conditions permit, a paver can be used for operation. If machine paving is not available, a forklift can be used to lift the ton bag, open the bottom discharge port, and reverse the construction. While releasing the material, manually scrape it flat and follow up with the first rolling. After rolling, cool it for about 1 hour. At this time, visually observe that there is no fluid cold mix on the surface or pay attention to the wheel hub mark during rolling. If there is no abnormality, a small roller can be used for the final rolling. The second rolling will depend on the degree of solidification. If it is too early, there will be wheel marks. If it is too late, the flatness will be affected due to the solidification of the road surface. Manually randomly trim the edges and pay attention to whether there is wheel sticking. If there is wheel sticking, the roller will add soapy water to lubricate it to remove the particles stuck to the steel wheel. If the wheel sticking phenomenon is serious, extend the cooling time appropriately. After cleaning and compaction, a layer of stone powder or fine sand can be evenly sprinkled on the surface, and sweep back and forth with a cleaning tool so that the fine sand can fill the surface gaps. The surface of the repaired pit should be smooth, flat, and free of wheel marks. The corners around the pit must be compacted and there should be no looseness. The compaction degree of ordinary road repairs must reach more than 93%, and the compaction degree of highway repairs must reach more than 95%.
Open traffic: Pedestrians and vehicles can pass after the repair area is solidified and meets the conditions for opening traffic. Pedestrians can pass after rolling two to three times and letting it stand for 1 to 2 hours, and vehicles can be opened to traffic depending on the curing of the road surface.
IV. Application scenarios
Asphalt cold patch material is widely used to fill road cracks, repair potholes and repair uneven road surfaces, providing a long-lasting and high-strength repair solution. It can be used for maintenance work on roads at all levels, such as highways, urban roads, expressways, national roads, provincial roads, etc. In addition, it is also suitable for the maintenance of parking lots, airport runways, bridge pavements, construction machinery and contact parts, as well as the laying of pipeline trenches and other scenes.
In summary, road repair and maintenance asphalt cold patch material is a road repair material with excellent performance and convenient construction, and has broad application prospects.