Asphalt cold patching is to mix and modify asphalt at room temperature. If proper anti-rutting agent and anti-stripping agent are added to the cold patching material, the adhesion between asphalt and stone can be effectively improved, the high-temperature fluidity, deformability and low-temperature brittleness of the cold patching material can be enhanced, and rutting can be reduced. Yantai Huatong Company is a restructured enterprise of Longkou Transportation Bureau, formerly known as the county and township highway maintenance emergency center of Longkou City. It is the earliest manufacturer of asphalt cold patching materials in China. 3000 asphalt mixing station is used for mass production, with good uniformity and complete testing equipment.
Elaboration on cold patching technology of Yantai Huatong Company;
In road maintenance engineering, compared with the traditional concept of high temperature hot repair, normal temperature or low temperature cold repair is adopted. Cold patching materials are cold patching materials, in English: C0 1d Patch. Specifically, asphalt cold patching material refers to a mixture of unheated mineral aggregate and diluted asphalt. According to the mixing form, it can be divided into factory mixing and on-site mixing.
Before 1998, there was no real cold patching material in road maintenance engineering in China, only water-based emulsified asphalt material was used for normal temperature patching. After 2000, Yantai Huatong Company introduced the first asphalt cold patching material with stable performance. As a high-tech product, cold patching materials have been widely used in national highways, county and township highways and municipal roads.
Compared with ordinary hot mix, asphalt cold patching material is a high-tech road patching material, which can be used all day. It is suitable for repairing different types of pavements in any weather and environment, such as asphalt, cement concrete pavements, parking lots, airport runways, bridge expansion joints, etc.
Formation mechanism of asphalt cold patching material;
The strength forming process of asphalt cold patching material in Yantai Huatong Company is different from that of hot asphalt mixture. The asphalt used in hot asphalt mixture is thermoplastic, while the asphalt used in cold patch asphalt mixture is modified and not completely thermoplastic. The strength formation of cold patch mixture is a slow process, which is plastic and fluid when paving and rolling, and can be squeezed into irregular pits and grooves. Under the action of driving and air, some solvents volatilize, the asphalt gradually thickens, the particles of cold patching mixture are more closely distributed, the porosity is reduced, and the combination between minerals and aggregate is stronger. With the increase of mixture density, the feeling of soft pavement will gradually disappear, which takes 7- 10 days. After that, the strength will gradually increase, and its deformation and strength will gradually stabilize in about three months, reaching or exceeding the performance of hot asphalt mixture after cooling. The strength of cold patching mixture consists of two parts: one is the cohesion and adhesion of the mixture formed by the interaction between modified asphalt and mineral aggregate. They make it difficult for mineral particles to separate and form a whole, and also make the mixture have high adhesion to the original surface, which is not easy to peel off and move. The second is the internal friction resistance of the mixture formed by the embedding and locking of mineral particles after rolling. These two forces of cold patch constitute its initial strength, which is enough to resist the action of vehicle load.
Yantai Huatong Cold Patch Features:
1 All-weather maintenance materials
Huatong cold patching material is suitable for a wide range of ambient temperatures, from -30℃ to 50℃, and can timely repair pits and grooves under the harsh environmental conditions of rain, snow and humidity.
2, the construction is simple
There is no need to stick oil when using Huatong cold patching material to repair pavement pits and grooves. Raw materials can be taken at any time without heavy construction machinery, and impact compaction, manual compaction or automobile tire rolling can be adopted according to different pavement repair conditions. Moreover, the area repaired with Huatong cold patching material can be opened to traffic immediately, and the traffic is not closed, which greatly relieves the traffic pressure brought by road patching construction.
3, the application range is wide
Huatong cold patching material has good adhesion with different base materials such as asphalt concrete, cement concrete, metal surface and wood surface, and can be widely used in repairing and maintaining damaged potholes, digging potholes, repairing pavement after laying underground pipelines, around manhole covers, bridge pavements, parking lots, airport runways and parts that are difficult for construction machinery to reach.
4. Excellent quality
Huatong cold patching material road has strong anti-aging bonding performance, and the service life of the repaired pit and groove is more than 10 year, so it is not easy to fall off and crack, and it is not necessary to repair it repeatedly.
5. The maintenance cost is low.
When using Huatong cold patching material in construction, it is not limited by the weather, the size and quantity of pits, and can be taken at any time according to the actual amount when repairing. The remaining materials can be used for the next repair without wasting materials, and the utilization rate of 100% is truly achieved. It will be the most economical and effective to replace the traditional centralized repair method with immediate repair method.
6. Convenient transportation
The area repaired by Huatong cold patching material can be opened to traffic immediately without traffic closure, which can greatly alleviate the traffic pressure caused by road patching construction.
7. Environmental protection
The production and use of Huatong cold patching material will not produce pitch black smoke and waste, and the finished product is insoluble in water, so it will not pollute the atmosphere and groundwater, which is beneficial to environmental protection.
8, easy to save
Huatong cold compress can be stored indoors and outdoors without covering. If bulk materials are stored, it is recommended to store at least 20 ~ 30 tons of cold patch and pile it into a pyramid shape. The shell formed for a long time can be mixed with internal loose materials for use. Bulk materials can be stored for more than two years, but they can be stored in bags indefinitely without caking. During low-temperature construction, it should be stored in a warehouse above 5℃ for 24 hours.
9. Significant social benefits.
Using Huatong asphalt cold patching material can timely repair pits and grooves, keep the pavement smooth and beautiful, ensure smooth roads, reduce pavement patching times and workload, and prolong the service life of roads.
Huatong asphalt cold patching material introduced by Yantai Huatong Company is a high-tech road patching material. The core material is imported from America, with stable performance and high viscosity. It can be used in all weather from -30℃ to 50℃, and is suitable for repairing different types of pavements in any weather and environment, such as asphalt, cement concrete pavements, manholes, parking lots, airport runways, bridge expansion joints, etc.
Construction technology of asphalt cold patching material in Yantai Huatong Company;
1, pit cleaning
Determine the excavation position of the pit. After milling or slotting around, clean up the gravel and waste residue in and around the pit to be repaired. There shall be no mud, ice and other sundries in the pit. The repaired pit should be trimmed and cleaned up, and the waste residue should be removed until a solid surface is seen.
2. Brush the interface agent
Brush the interface agent around and at the bottom of the cleaned pit, especially around the pit.
Step 3 Fill the pits and grooves
Fill the pit with enough cold patching material until the filler is about 1. 5 cm above the road. After filling, the center of the pit should be slightly higher than the surrounding road surface, showing an arc shape. When the depth of the pavement pit is greater than 5cm, it should be filled in layers and compacted layer by layer, with each layer being 3 ~ 5cm.
Step 4 compact
After laying evenly, according to the site environment, the size and depth of the repair area, choose the appropriate compaction tools and methods for compaction. Such as automobile tire compaction, manual tamping, vibrating plate tamping and rolling. When repairing a high-grade highway, the periphery and corners of the repair area should be fully compacted.
5. Open traffic
It can be directly opened to traffic after compaction.
Storage and packaging:
Keep in a cool place, away from fire sources. Packing: 50kg/bag. The shelf life is 2 years.
Yantai Huatong Road Engineering Co., Ltd. is the first manufacturer of asphalt cold patching materials in China. Its main products are: asphalt, cold joint sealant for cement pavement, joint adhesive tape, color cold patching material, interface agent, sealing asphalt, cold patching asphalt and materials for repairing broken skin and pitted surface of cement pavement.
Common repair materials for highway diseases produced by Yantai Huatong Company: 1. Asphalt cold patching can be used to repair pits and grooves, and can be directly repaired and opened to traffic; 2. Cold joint sealant can be used for cracks in cement pavement, which can be directly opened to traffic, and the cost per meter is not higher than that in 2 yuan. 3, asphalt pavement cracks can use joint tape, according to the direction of cracks, joints will be integrated with the original asphalt pavement after 2 months, will not jump, will not affect the snow removal in winter; 4. The damaged surface of cement pavement can be repaired with quick repair materials, with a 5 mm thin layer and open to traffic for 2 hours; 5. The color cold patching material can be used to pave or repair the potholes on a small area of colored pavement. At the construction site, bags can be unpacked, laid and compacted, and then they can be opened to traffic. 6. Purchasing cold patch asphalt can reduce the cost of cold patch asphalt, which is mainly composed of cold patch asphalt and stone mixed at room temperature. Purchasing cold patch asphalt can greatly save freight, and it is directly mixed with local stone (machine-made sand) at room temperature. Each ton of cold patch asphalt can mix 24 tons of synthetic cold patch materials, which is easy to operate.