Research On The Durability And Total Benefits Of Long-Life Micr Overlay Of Asphalt Pavements

Highway traffic is not only the foundation of national economic development, but also an important indicator of a country’s level of modernization, and the functional performance of the highway is one of the service level reflecting the significant part of the highway. The asphalt pavements of all grades in China are gradually entering the period of repairing and maintenance; meanwhile, the technology of pavements preventive maintenance is rapidly developed, and the asphalt pavements preventive maintenance techniques in various countries including China has a long history of application, extending the life of the highway, and reducing overhaul inputs a lot. However, due to various types of preventive maintenance technology, there are still many deficiencies in application and the extension of pavements life is not obvious, and a new technology meeting the needs of the pavement and also extending the pavement life is deadly in need. The technology of Long-Lived Micro Overlay is brought into being, and the advantages and functional performance to solve problems encountered in preventive maintenance is supreme.In this study, the technology of Long-Lived Micro Overlay is applied for the study, building ABAQUS numerical analysis platform, analyzing the mechanical response of micro overlay after the implementation of micro-technology under load with the original pavement layers, and using ABAQUS and pavement design software KENPAVE calculating pavement fatigue life prediction method to get the value after the implementation of micro overlay. Since the pavement fatigue life is associated with the combining durability between the micro overlay and the original pavement, micro overlay material durability and the durability of the asphalt concerned after the implementation of micro-overlay, it is necessary to carry out the comparative analysis of the fatigue life durability of the three statistics after the implementation of micro-overlay pavement to obtain the most critical factor. The results show that the combination of the interlayer durability is the biggest impact on pavement fatigue life.In order to solve varieties of problems of life cycle cost analysis method using home and abroad when selecting the preventive conservation measures after preventive maintenance measures including the implementation of micro overlay technology, we also propose innovative life-economic analysis model, which relies on the idea of dynamic programming, using local optimization method successively performed preventive maintenance program selection. According to the numerical example, the alternative preventive maintenance programs of micro-surfacing, micro overcoat and (ultra) thin overlay of three costs of owners and users, and benefits of value were calculated during the analysis period; then the total benefit value of the three preventive measures is compared, selecting the best preventive maintenance program. Due to the calculation, the latest micro overlay preventive maintenance measure is the supreme technical efficiency value, and the total cost of it reaches the maximum benefit. During the life time of each preventive maintenance, decisions can be made using this method in order to achieve maximum economic efficiency. The numerical example and sensitivity analysis not only verifies the feasibility and practical value of the method, but also provides a complete set of mechanics choice for preventive conservation measures-experience evaluation methods.