Study On The Long-life Asphalt Pavement In The Heavy Frozen Area

Heavy-frozen areas of Inner Mongolia has the harsh weather conditions and severe overloading, asphalt pavement that have been built in the early destructed seriously and rapid decline in road quality, a serious impact on the vehicle speed and the safe operation of heavy ice areas hampered rapid economic development. Therefore, in order to fundamentally improve and enhance the heavy-freezing areas the use of asphalt pavement performance, extending its life, the frozen zone for heavy traffic in Inner Mongolia and climate conditions, the introduction of foreign long-life asphalt pavement design and carry out heavy-frozen district asphalt pavement design study has important practical significance.This paper analyzes the climatic characteristics, traffic conditions and pavement status of the heavy-frozen area, with the area traffic and axle load distribution, heavy-frozen zone pavement design parameters of the axle load depth study found areas of heavy ice season axle load conversion parameters. Based on foreign long-life asphalt pavement design concepts, define the area of heavy ice damage to the critical state of asphalt pavement, with heavy-frozen climate and traffic characteristics, proposed heavy-frozen head of inner life index and the asphalt pavement design requirements. Area for heavy-freezing low temperature in winter characteristics of temperature on fatigue life of asphalt mixtures studied. At the same time, in accordance with long-life asphalt pavement layer functional requirements, study the life of asphalt pavement heavy-frozen head of the special structure of the functional layer set and reasonable basic types of long-lived in the area proposed asphalt pavement mix design and the layer disposal methods. Tensile strain at the bottom of asphalt layer, semi-rigid structural layer of bottom stress, the base top compressive strain, asphalt surface indicators for the control of shear stress, the use of road design software ANSYS10.0 frozen head of life on the road heavy-structure was optimized by pavement fatigue life analysis, recommended heavy-frozen areas suitable for long-life asphalt pavement.For verification, dissemination of research results, the research group in the sui seventh full-scale high-speed national highway abbott, two long-life pavement test road. Life test by heavy-frozen head of road construction technology and quality control system technology for the heavy-frozen head of life to promote the full implementation of the pavement structure provides a theoretical basis and practical experience.