Application and development of emulsified asphalt slurry seal coat?

With the extension of road construction and service life in expressway and cities in China, the workload of pavement maintenance is increasing, and the future highway work in China will focus on the maintenance of completed and planned highway projects. Therefore, micro-surfacing technology will have a huge market demand and a good prospect of popularization and application in the maintenance of high-grade highways and urban roads in China, which is followed by the market boom period of highway maintenance machinery (especially slurry seal). The research and development of modified emulsified asphalt slurry seal coat not only has a very broad market prospect, but also promotes the popularization of micro-surfacing technology. This paper briefly introduces the development prospect, application scope, structure and application characteristics of emulsified asphalt slurry seal coat, introduces some typical product catalogues at home and abroad, and emphatically introduces the development trend of slurry seal coat in China and developed countries. The characteristic of slurry seal coat is that it is mixed and spread on the road surface at room temperature, so it can greatly reduce the labor intensity of workers, speed up the construction and save resources and energy. It is suitable for regular preventive maintenance of pavement wear in highway and urban road departments to maintain the technical performance of pavement and prolong its service life. It can also repair the early diseases of the pavement and improve the waterproof ability, smoothness and skid resistance of the pavement. Emulsified asphalt slurry seal coat is made of four materials with proper gradation, such as aggregate, filler, asphalt emulsion and water, which are mixed and stirred in a certain proportion to make a uniform slurry mixture, which is spread on the road surface according to the required thickness to form a dense, solid and wear-resistant surface treatment thin layer. Emulsified asphalt slurry seal machine is a special equipment to complete slurry seal construction. I. Classification, application characteristics, working scope and main structure of sealing machine (I) Classification of sealing machine emulsified asphalt slurry sealing machine (hereinafter referred to as sealing machine) is a special equipment to complete slurry sealing construction. According to the flexibility of sealing machine, it can be divided into trailer sealing machine, semi-trailer sealing machine and self-propelled sealing machine. Choose a slightly modified trailer to install various devices of the traction sealing machine. The volume of the aggregate bin is 2-4m3, and it is equipped with an independent auxiliary machine. When it is working, it will be towed by a tractor or a truck for paving. This sealing machine has poor maneuverability, the spreading speed is influenced by tractors, and the productivity is low, so it is suitable for county roads or small slurry sealing projects. Self-propelled can sealers all use truck chassis to provide all power for driving and operation. It has the advantages of fast driving speed, self-transportation to the construction site, good maneuverability, large production capacity and good paving quality of ramps and bends, and is the main structural form adopted by foreign sealing machines at present. Semi-trailer sealing machine combines the advantages of the above two, paying attention to the convenience of operation, the simplicity of maintenance and the improved design of multi-load to improve its productivity. (II) Application characteristics of sealing machine The advantages of emulsified asphalt slurry sealing machine are: rapid maintenance and short traffic interruption time; It can reduce the thickness of pavement, reduce the project cost and save heat energy; Save asphalt consumption and prolong the service life of pavement; After pavement maintenance, road traffic noise is reduced; The adhesion coefficient of the pavement can be increased; Restore the smoothness of the road surface, reduce the deformation of the road surface and fill the gap in the road surface; Forming a pavement waterproof layer; Reduce the energy loss of vehicles; Excellent pavement structure and organization; The labor cost, mechanical cost and engineering cost of sealing machine are lower than other structural types; Although the slurry seal is thin, it is very durable; The asphalt is evenly distributed with moderate content, and the pavement is smooth and rough, without looseness and dryness, and the surface is oily and greasy. When paving, priming oil and binding oil are generally not sprinkled. (III) Scope of work of the sealer The sealer is characterized by mixing and paving on the pavement at normal temperature, which greatly reduces the labor intensity of workers, speeds up the construction and saves resources and energy. It is suitable for highway and urban road departments to carry out regular preventive maintenance of pavement wear layer to maintain the technical performance of pavement and prolong its service life. It can also repair the early diseases of the pavement and improve the waterproof ability, smoothness and anti-skid performance of the pavement. (IV) Main structure of the sealing machine According to the requirements of the sealing construction technology, the sealing machine must have the functions of feeding, stirring, paving and measurement control. It can transport aggregate, mineral powder, water and emulsified asphalt into a mixing drum according to a certain proportion, add additives, and quickly stir to form a flowing emulsified asphalt slurry mixture, which is sent into a paving tank by a spreading truck and then evenly spread on the road surface. Therefore, the structure of the can sealing machine can be divided into two parts: one is the walking chassis, which is the walking and bearing part of the machine. Its function is to make the machine run at a predetermined speed, complete the running tasks in transportation and operation, and arrange a full set of operating devices on it. Generally, the truck chassis with bearing capacity meeting the design requirements is selected for the sealed truck, and it is transformed into the sealed truck chassis. The transformation is mainly to add a first-class shift system, which can make the minimum speed of the car reach 1. The second part is the operation part, whose function is to complete the storage, transportation, mixing, paving, control and operation of various materials during the operation of the machine, which is mainly composed of feeding system, mixing system, power transmission system and metering control system. Among them, the feeding system is the most important part of the sealing machine, and it is also the key to whether several materials of modified emulsified asphalt can be made into slurry mixture according to the ratio requirements; The paving system spreads slurry evenly on the road surface, and controls the width and thickness of slurry paving as required. Second, the development level and development trend of sealing machine (I) Foreign level and development trend Since 1928, France and Germany have successively carried out research on slurry sealing machine. The early slurry seal equipment is to mix slurry mixture with cement concrete mixer, and then transport it to the site by tanker and spread it manually. Since the 1960s, European countries have begun to develop a sealing machine, which can integrate the preparation, mixing and paving of slurry mixture, thus making the construction method of slurry sealing greatly developed. Over the years, European and American countries have continuously improved and perfected the sealing machine, making this construction method truly embody the advantages of economy, effectiveness, rapidity and reliability. The continuous emergence of new sealing machines has further promoted the application of this technology in the world. (2) The advanced sealing machines abroad mainly have the following characteristics: 1, and the products are serialized. Generally, the volume of the header is 4- 15m3, and the models are bicycles and semi-trailers. In addition to the traditional vehicle-mounted sealing machine, there is also a sealing machine that continuously scatters materials on the way, with a production capacity of more than 500t/d. The mixer adopts a double-shaft forced stirring paddle, and the top of the paddle is equipped with cemented carbide, which is 10 times longer than the traditional quenching paddle, and the angle of the paddle is adjustable. In addition to mixing ordinary slurry seal mixture, polymer modified emulsified asphalt slurry mixture can also be mixed, which expands the scope. 2. Adopt mechanical, electrical and hydraulic integration technology. Modern sealing machine is equipped with electronic detection device, which can accurately detect the grading of various materials and the operation of each part. Through the application of computer monitoring machine, electricity and liquid integration technology, the operation of the whole machine can be controlled centrally, with high degree of automatic control and convenient operation. 3. Using advanced truck chassis, the highest running speed can reach above 80 km/h, and the sealing machine can realize the rapid transportation and transfer of materials. In sealing operation, hydraulic transmission is generally used to stabilize the working speed at 1-4km/h, and auxiliary engines are used to provide power for each working device. The width of the paving trough can be adjusted to adapt to different pavement widths. The distributor in the paving groove has single-shaft propeller blades and double-shaft or triple-shaft blades. In addition to square paving boxes, there are V-shaped paving boxes for paving ruts. (3) The future development direction of sealing machine is 1, realizing multi-variety and serialization. At present, the domestic seal manufacturers are all single varieties, and the chassis selection is different. With the increase of slurry seal construction year by year, large seal machinery will appear, and the volume of aggregate bin will reach 12m3 and 15m3. In addition to introducing foreign advanced technology and developing a series of sealing machines, we should also strive to develop a fully domestic modified slurry sealing machine with lower price, which will have a great impact on the modified slurry sealing machine in China. 2. Efforts should be made to improve the overall quality of sealing machine products in China. In this respect, in addition to the restrictions imposed by China automobile manufacturers on the automobile chassis, the materials and components of the upper working device should be selected to ensure the durability of the components, and the electronic components and hydraulic components should be sensitive, reliable and leak-free. 3. The type of can sealer is developing towards train type and large scale. 4. From intermittent operation to continuous operation. 5. Strive to develop in the direction of one machine with multiple functions, so that it can not only seal the coat, but also spread the thin surface of cold material. 6. Adopt ultra-static engine and develop towards low noise. 7. Adopt hydrostatic transmission, and strive to make it walk smoothly in low speed area. 8. Adopt electromechanical and hydraulic integration technology to develop in the direction of high degree of automation. Modern emulsified asphalt slurry seal coat can not only produce and spread common emulsified asphalt slurry mixture, but also produce and spread polymer modified emulsified asphalt slurry mixture for fine surface autonomy (PSM) and rutting repair (PSR). The improved slurry sealing machine is the most advanced slurry sealing machine at present.

For more information about project/service/procurement bidding, and to improve the winning rate, please click on the bottom of official website Customer Service for free consultation:/#/? source=bdzd