Cold production and application in winter asphalt pavement maintenance
With the rapid development of trunk highway construction in China, the maintenance and management of highway pavement is becoming more and more arduous. Especially in recent years, with the increase of all kinds of transport vehicles, the pavement diseases are very serious, which inevitably requires highway maintenance workers to improve the level of maintenance and maintenance efficiency. Especially in emergency maintenance work, high efficiency, fast, stable and safe are the key links. It makes cold patching materials widely used in emergency maintenance, especially from the aspects of timeliness, operability and social impact. The application prospect of cold patching technology is relatively broad.
Cleaning damaged area
Best cold-repairing asphalt mixture is a kind of asphalt mixture which is made up of mineral material, petroleum asphalt, diesel oil and cold-repairing agent according to the use purpose. Mixture can be stored and transported in bags at natural temperature without further processing. When there are pits and other diseases on the road surface, it can be transported to the construction site at any time for immediate repair, which is convenient and fast.
Packing paving
First, the characteristics of cold asphalt repair material
1. applies to any weather and environment. The bituminous cold patching material has a wide range of ambient temperature and can be used between -26 C and -49 C. Its waterproof performance is excellent, construction in rain and snow weather.
2. construction is simple. Using asphalt repair material, there is no need for sticky oil during repair. Material can be readily available, no heavy construction machinery is needed. Roller compaction, impact compaction and manual compaction can be used according to different repairing conditions of pavement.
3. the quality is excellent. The bitumen cold patching material has strong anti-aging and bonding properties. After repair, the pit is not easy to produce bad phenomena such as falling off and cracking.
4., easy to save. The bitumen cold patching material can be stored in open air for more than one year at room temperature, and bagged and sealed products can be stored for a longer time.
5. production is simple. The bituminous cold patching material is simple in production process and can be directly produced by using traditional hot asphalt mixing equipment.
6. facilitate transportation. The area repaired with asphalt cold repair material does not need to close traffic, and can be opened immediately, which can greatly alleviate the traffic pressure caused by road repair construction.
7. green environmental protection. The production and use of bitumen cold patching materials do not produce dust and black smoke, and the finished products are insoluble in water. Therefore, it will not pollute the atmosphere and groundwater, and is conducive to environmental protection.
8., wide range of uses. Asphalt cold patching material has good bonding force with asphalt concrete, cement concrete, metal surface, wood surface and other materials of different substrates, and can be widely used in various pavement repair and maintenance.
9. the cost of repair is low. The use of asphalt cold repairing material in construction is not limited by weather and the size and quantity of pits. Timely repairing can avoid the expansion of pits and save repairing materials. There is no need for heating or stirring during repairing. The remaining materials can be used at any time according to actual dosage. It will not cause material waste in the next repairing.
10., the social benefits are remarkable. The use of asphalt cold repair materials can repair the pavement in time, keep the pavement smooth, ensure the smooth road, ensure traffic safety, and extend the life of the road.
Rammed and rammed
Two. Application of bitumen cold patching material in pavement maintenance disease repair
1. pit cleaning. The gravel and waste residue in and around the pit to be repaired shall be cleaned up, and no mud, ice and other debris shall be stored in the pit. Municipal road engineering repair, repair before the pit should be trimmed neatly, the removal of waste slag to see solid surface.
2. fill the pit. Fill enough pit cold fill material into the pit until the filling is about 1.5cm higher. For municipal road repair, the input of cold repair materials can be increased by about 20% or 10%. After filling, the central part of the pit should be slightly higher than the surrounding pavement 1 cm and arc. If the depth of the pit is greater than 5 cm, it should be filled in layers and compacted layer by layer, each layer being 3 CM-5 cm.
3. compaction. After laying uniformly, according to the field environment, the size and depth of repair area, select appropriate compaction tools and methods for compaction.
4. clean up. After compaction, a layer of stone powder or fine sand can be evenly sprayed on the surface and cleaned back and forth with a cleaning tool to fill the surface voids so as to ensure that the cold filling material does not stick to the wheels and make the surface smooth and compact.
5. acceptance. The surface of the repaired pit should be smooth, flat, wheeless, compacted around the pit without looseness. The compaction degree of ordinary road should be over 93%, and the compactness of highway repair should reach more than 95%.
Complete diagram
Comparison with traditional process
Colder material
Traditional hot patching materials
Emulsified asphalt mixture
Room temperature and low temperature condition
Remain loose and not lump.
It can only be used at high temperature. It can not be used when it is lump or hardened at normal temperature.
Ice will not be used at low temperature.
Construction season
It is not affected by climate, and can be constructed in winter and rain and snow.
Winter and rain and snow weather can not be constructed.
Generally no construction can be carried out under 5 degrees Celsius.
Treatment of pit
Simple treatment can be repaired, and a small amount of water in the pit will not affect the construction.
Clean up, remove accumulated water and dry, brush the oil layer.
Cleaning, shaping and removing accumulated water.
Deposit
In the open air for more than 6 months, the bags are kept longer.
Can not be stored, must be used at that time.
Generally it can be stored for 3-7 days or longer.
Construction performance
Good. No skilled workers and special machines are required.
Skilled workers and special machinery are needed.
Skilled workers and special machinery are needed.
Material utilization ratio
The remaining materials can continue to be used next time. Can achieve 100% utilization rate
The amount of material must be more than the amount of material used, and the remaining materials can not continue to use.
Emulsion broken materials can not continue to use.
Open traffic
After the repair is completed, it can be opened to traffic immediately.
After completion of the repair, the traffic will be closed for some time.
After completion of the repair, we need to close the traffic and wait for the completion of demulsification.
Durability
Very good. The life span is over 3-5 years.
commonly
commonly
Consumption of materials and expenses
Repair in time, reduce repetitive repair, save materials, reduce the cost of shutdown in winter and rainy and snowy seasons.
It can only concentrate on repairing, resulting in improper repairing, worsening pavement damage, waste of repairing materials and inconvenience of traffic.
Under normal circumstances, it can be repaired in time, and it can be used in quantity to reduce the cost of downtime and downtime.