Study On The Mechanical Characteristics Of Xining Rounded-city Highway Bridge Deck Pavement And Its Asphalt Mixture Material Composition

Since the special climate condition and location of Xining area, the operating temperature of asphalt pavement is generally low, and it changes significantly, the daily maximum temperature and the minimum temperature differential exists above 10 ?throughout the year, so a high requirement low temperature crack resistance of asphalt mixture; on the other hand, Since the design of asphalt mixture materials and the selection of asphalt, many major highways in Qinghai widespread rutting in recent years, high temperature properties of asphalt mixture also put forward higher requirements. Based on this, to ensure the material composition design of asphalt mixture in Xining rounded-city highway bridge deck pavement can meet the local climate characteristics and the pavement structure performance, the paper comprehensive statistical analysis of annual temperature changes Xining area, build the bridge deck pavement temperature field prediction model and asphalt pavement temperature field force analysis model, and take a in-depth study on mechanical response of asphalt pavement under traffic loads, propose the key performance indicators of bridge deck asphalt mixture in different layers, determine the composition design of bridge deck asphalt mixture. The main experiment contents include:(1) Took a comprehensive statistical analysis of the annual temperature change situation in Xining region, established the asphalt pavement temperature field model and bridge deck pavement temperature, analyzed the variation law of temperature field, and verified the temperature field of bridge deck pavement through the indoor and outdoor test.(2) Established mechanical model of bridge deck pavement based on temperature field, took a in-depth study to analyze the mechanical response of asphalt pavement under traffic load, proposed the key performance indicators of bridge deck asphalt mixture in different layers.(3)Combined the key performance indicators of bridge deck asphalt mixture in different layers of, to determine the material composition design of bridge deck pavement asphalt mixture.(4) Proposed evaluation method and evaluation index about the key bridge deck pavement asphalt mixture performance, verified the pavement performance of Xining rounded-city highway bridge deck pavement asphalt mixture.