I. Overview In recent years, with the rapid development of highway construction in our country, the Ministry of Transportation proposed that the development of roads be adequate for both development and maintenance so that the completed roads exert their due economic benefits. In the road maintenance policy, they explicitly put forward that "prevention should be the mainstay and prevention and control Combined. " Slurry sealing technology as a preventive maintenance of the most cost-effective construction technology, is being rapidly promoted by the highway sector. Second, the role of emulsified asphalt slurry seal and the scope of slurry seal is the appropriate grading aggregate, filler, emulsified asphalt, water, additives and other raw materials, according to a certain percentage of blending blending, made of uniform Slurry mix, and according to the required thickness and width paved on the road. Slurry sealing construction method for low-grade roads or high-grade roads, whether urban roads or suburban roads, can have significant economic and social benefits. Slurry seal can wear, aging, cracks, smooth, loose and other diseases, quickly be repaired, play a waterproof, non-slip, smooth, wear-resistant and so on. Emulsion asphalt slurry seal construction technology in our country is still a new technology, mainly used in the following aspects: 1, the maintenance of old asphalt pavement due to long-term exposure to the natural environment, by the sun, the wind , Rain and freeze-thaw, but also bear the repeated load of the vehicle. After a period of use of the road surface, there will be fatigue, the road will show cracking, loose, aging and wear and tear and so on. If not repaired in time, the damaged pavement will be eroded by the surface water, which will weaken the overall strength of the soft pavement at the grassroots level and cause the destruction of the pavement. If the asphalt pavement takes the necessary precautionary maintenance measures before it is destroyed, the emulsified asphalt slurry seal will make the old pavement look new and make the repaired pavement waterproof, anti-slip and wear-resistant A good layer of protection, played a role in extending the life of the road. 2, new shop asphalt pavement seal In the newly paved coarse-grained asphalt concrete pavement, in order to increase the waterproof and abrasion performance of the pavement, paving a layer of emulsified asphalt slurry seal layer on the pavement. The thickness of 5mm, only half the thickness of hot tar sands, you can save money and has the characteristics of simple construction and high efficiency. For the highway under the seal. After the construction of stable highway over the highway, the slurry seal construction, and then hot asphalt surface, can effectively improve the waterproofing of the road. This construction technology will be commonly used in highway construction in the future. For example, "Beijing-Zhuhai Expressway" will use this construction technology. 3. Abrasive Wear Layer on Gravel Pavement An emulsified asphalt slurry seal layer is applied on the gravelly compacted gravel road to make the appearance of gravel road have the characteristics of asphalt pavement and improve the abrasion resistance of gravel pavement , To prevent dust, improve driving conditions. In the county and township rural road reconstruction has a wide range of applications. 4, maintenance and repair of cement concrete pavement and bridge deck Emulsified asphalt slurry seal has good adhesion to cement concrete, cement concrete pavement after many years of traffic, the road cracks, Ma surface or slightly uneven, the use of emulsified asphalt thin After the seal layer, can improve the appearance of the road, improve the smoothness of the road, to extend the service life of cement concrete pavement. In the driving surface of the bridge with emulsified asphalt slurry seal can play a role in the cover, and rarely increase the deck's weight. Third, the slurry seal has a good economic and social benefits 1, the slurry seal has good economic benefits The results show that: with the slurry seal for the scheduled preventive maintenance of the road costs than not to maintain the use of 20 years and then The cost of reconstruction is 63% lower, 55% lower than the cost of paving every 10 years, and the pavement performance is much better. 2, reduce environmental pollution and improve the construction conditions Slurry seal construction from loading, mixing, mixing, paving throughout the operation at room temperature, emulsified asphalt and sand aggregate without heating, without heavy manual labor, complete By the mechanical automatic operation, reduce labor intensity, significantly reduce the emission of harmful substances. 3, energy conservation With hot asphalt road repair, the general asphalt should be heated to 165-170 ℃, reverse transport needs to be reheated, mixed with a large amount of sand used for mixing must also be heated to 160 ℃ after drying. With emulsified asphalt road repair, as long as the production of emulsified asphalt will be heated to 130 ℃ asphalt, no matter how many times after reversal or save for a long time without heating. Mixing mix used aggregate, even in wet conditions, but also mixing, without drying heating. According to statistics, the use of emulsified asphalt road asphalt with energy saving than 50%. 4, to extend the construction season Emulsified asphalt slurry seal in the surface temperature of 10 ℃ or more, you can carry out construction, hot asphalt can be extended than the general 2-4 months of construction time. And immediately after the rain construction, reducing downtime after the rain costs in order to complete the construction task ahead of schedule, is conducive to the timely maintenance of asphalt pavement, stop the disease intensified and expanded. IV. Emulsified Asphalt Slurry Sealing Potential Huge Market In recent years, the highway industry in our country is developing rapidly. The mileage has exceeded 133X104km, which is 16 times that of the early days of the founding of PRC, in which the development of expressways is even faster. Now the opening up to 12000km . In the next 10 years, roads will continue to develop rapidly. At present, most of the existing asphalt pavement and concrete pavement in our country are overloaded and over-extended with the economic development and traffic volume. Therefore, it is urgent to carry out large and medium-sized repair or maintenance. At present, there is an urgent need to speed up conservation, improve the quality of conservation and reduce the cost of construction. After practice, slurry seal is suitable for the best preventive maintenance of highway construction methods. With the gradual formation and improvement of the road network, the requirements for the upgrading of low-grade roads will increase the use of emulsified asphalt; as the awareness of environmental protection and the gradual tension of energy, the proportion of emulsified asphalt to asphalt will also increase high. According to the statistics of the International Slurry Sealing Society, the amount of emulsified asphalt used for slurry seal in the world is continuously increasing, from 2.91 million tons in 1996 to 3.6 million tons in 1999. Slurry seal in our country is a new technology, is in the promotion and application stage. Currently in Henan Province, Liaoning Province to promote better, other provinces are pilot promotion. Fifth, emulsified asphalt slurry seal used mechanical equipment Slurry seal used by the equipment mainly asphalt emulsified equipment and emulsified asphalt slurry seal machine. Asphalt emulsification equipment is a mechanical effect, the pitch cut into tiny particles suspended in an aqueous emulsifier solution to form an oil-in-water emulsion. Mainly consists of 5 parts: asphalt preparation system, emulsifier aqueous solution blending system, asphalt emulsifier, metering control device and electrical system, asphalt emulsion storage system. Emulsified asphalt slurry sealing machine is the appropriate grading aggregate, filler, emulsified asphalt, and water and other raw materials, according to a certain percentage of blending, mixing, made of uniform slurry mixture, and the thickness of the required booth Shop on the road machinery. The working process is in the sealing machine walking, continuous for ingredients, mixing, paving. Mainly consists of the following systems: automotive chassis, operating power systems, mineral feed system, asphalt feeding system, water supply system, filler feeding system, additive system, mixing system, paving system. Slurry sealing machine manufacturer Xuzhou Construction Machinery Group Corporation in the early 1990s the introduction of German WEISIG company's technology, production RF80-type slurry seal machine, but also developed a series of RF100, RF100B, RF80C-type slurry seal machine; Xi'an Road Machinery Plant production MS9; Shenyang North Traffic Engineering Machinery Company PM800, PMl00; Henan lofty company XF12. Hebei Lulong Machinery Factory LLY151TYL; Sweden AKZO's HD10; German Braun company's S-HY800. Six, emulsified asphalt slurry sealing technology and the development trend of slurry sealing machine Modified emulsified asphalt slurry seal At present, the International Slurry Seal Association (ISSA) is promoting modified emulsified asphalt slurry seal technology (Micro surfacing ). In the production of emulsified asphalt in the process of adding organic polymers, made of modified emulsified asphalt, modified emulsified asphalt slurry seal construction can effectively improve the performance of asphalt pavement, prolong the service life of the road. 1. Productivity Improvement For the preventive maintenance of expressways and heavy traffic pavements, the International Slurry Seal Association proposed a type IV seal and a modified slurry seal with a maximum aggregate size of 12 mm and a ply thickness of 15 mm. Requires slurry seal machine with higher productivity, the new generation of slurry seal machine equipped with more powerful auxiliary engine, the engine power from 50kW to 30kw even higher. 2, automation and easy operation of computers, sensors and other new technologies to improve the degree of automation of the machine and paving quality. The control device is concentrated in the console, a variety of operating handle merger, making the operation more simple and convenient. 3, continuous emulsified asphalt slurry sealing machine traditional intermittent
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