Micro-Surfacing Conservation Technology And Its Application Education

As of the end of 2006,The opening of China's highway mileage reached 41,000 km, Expressway on China's economic and social development plays an important role in the foundation. But bad Expressway serious damage to the road early, the opening of 6,7 years many highways had entered a period of overhaul and abroad is usually 15 or so. In light of this situation, according to the actual situation around in the road early in the disease, to take timely preventive various conservation measures, such as slurry seal, Micro-Surfacing technology, through early conservation, and to effectively improve and enhance the technology of the road conditions postponed and extended the overhaul period, achieving very good results. At present, China's annual paving Micro-Surfacing of 10 million square meters, taking into account the Micro-Surfacing technology should be widely with application examples in our province, the paper system on the conduct of Micro-Surfacing time, the choice of materials used and the technical requirements, Micro-Surfacing mixture of design, the Micro-Surfacing construction technology, the process of construction quality control was introduced. The following major elements:First, the choice of material and technical requirements1. Mineral aggregate: Because Micro-Surfacing is used as a high-grade highway pavement wear layer, a good slip resistance, waterproof and wear resistance. Requests must be a wear-resistant mineral aggregate of hard stone, and the unit should be conditional on the stone crusher used for multi-stage smash. As a result of the wear layer, Micro-Surfacing aggregate gradation rough it is not appropriate to small, multi-use typeⅢgraded.2. Modified emulsified asphalt: Micro-table is the bond, its quality is good or bad quality of the impact of closures of the most direct and obvious, the main characteristics of the modifier, the emulsifier, emulsifier is slow crack rapid solidification emulsifier cationic emulsifier modifier should be a good compatibility. The main role is additive regulation slurries mixture can be mixing time, breaking speed, divided into procoagulant relaxed type of condensate.Second, the micro-table Construction Technology1. Introduced Micro-Surfacing Mixture design of specific methods and steps. First the light of experience primaries modified emulsified asphalt, filler, the amount of water and additives, according to dilute slurry mixture technical requirements, conduct tests and mixing cohesive force pilot. Mixing experiments here can be considered the highest temperature Construction, cohesion test should be considered the minimum temperature. The article described in detail test slurries mixture consistency, mixing time, cohesion, the initial setting time of operable, and visual inspection methods.2. Micro-Surfacing technology on construction machinery and equipment and construction conditions are strict requirements. Construction shall not be less than 10°C. Because Micro-Surfacing the highway just as waterproof, anti-skid and wear-resistant layer of wear, can not afford the loading and therefore the road must have sufficient overall strength. Pre-construction quality inspection of the material, especially on a unit volume of mineral aggregate weight to the car for paver calibration. The mechanical equipment calibration; test section through the paved with further define Construction oilstone ratio and the ratio of aggregate gradation.3. Good Paving width adjustment, according to the production mix and the scene by the water content ratio of aggregate input of mixture components,after Paver car uniform forward paver. Local professionals repair defects due to post - paver RCC, according to the best experience Shao RCC this time.4. Quality control in construction projects is the key to success, the construction should be strictly in accordance with the micro-table test and the detection of frequency detection, and introduced operational, the applicable consistency test experience, premature mixture demulsification the control method, paving thickness control, repair of rutting quality control method.5. Common in the construction of a number of quality issues, and gives approach. If the partial closure of the loss, loose,joints scratch the surface defects and other issues.Third, the Micro-Surfacing Technology ApplicationIn recent years, the technology in micro-table highway has been extensively applied in our province, the paper business to long-K56-68 TWO-AMPLITUDE introduced micro-Table as an example the application of the technology.1. Conducted on the original road traffic survey and found that the per kilometer of road damaged in the rate exceeded 3.5%, shows that PQI below 75 points, the technical state of the roads has been reduced, should promptly take the necessary conservation measures2. This project with Micro-Surfacing ore material is basalt groove Jilin herded cows, mineral aggregate clean, hard, in line with the targets and inspection requirements. The graded using MS-3 grade, blended in the ratio of 25:65:10. In accordance with the requirements of mixing test and cohesion test, the Micro-Surfacing mixture Specifications prevail.3. In the construction process, the modified emulsified asphalt on a daily basis, mineral aggregate, dilute the slurry mixture of technical indicators to ensure compliance. In paver process, we believe that consistency experience with measured consistency is effective. In practice, there are still demulsification prematurely discovered the problem, for which, according to laboratory tests, adding a retarder not quantitative, the problem can be resolved. According to experience, demulsification initial setting in the mixture, the surface was carried out at the blackened RCC, RCC Practice has proved that time is accurate.4. This project fully proved some of the micro-table advantages, such as the construction of fast, open traffic fast, cost-effective Obviously, environmental protection and other features.5. Completion of the development work for a month, and we are sections of the technical analysis, results showed that the friction coefficient of the road at this time, the depth and water seepage structure coefficient have been enhanced and improved, the targets to meet the requirements. The current year has been the use of road space technology in good condition, without partial shedding loose phenomenon.