Study On The Shear Behavior Of Large Longitudinal Slope Bridge Deck Asphalt Pavement Surface

With the increasing of traffic volume, axle loads, over loading and traffic channelization, serious rutting occurred on the heavy-duty asphalt pavements after opening to the traffic, and the rutting of asphalt pavement is close related to the anti-shear characteristics of asphalt mixture.In addition to the load and environment factors, the materials and the pavement structures will affect the asphalt pavement to anti-shear. It is very necessary to the asphalt materials and structures design.Through the mechanical analysis of large longitudinal slope bridge deck asphalt pavement, we have come to rutting is the most serious damage to the uphill and shear damage is the most serious damage to the downhill. Through the study of the shear resistance factors and comparative study of the common road performance, we can draw the following conclusions. Shear parameter and dynamic stability are basically trend with the increase of particle size; there is an optimum gradation and optimum asphalt ratios so that the shear strength and high,low temperature stability will reach the maximum; modified asphalt mixture can significantly improve the performance of the shear strength and high,low temperature stability; we should strictly control the degree of compaction to improve the shear properties of mixture.In addition, the paper also analyzes the distress of large longitudinal slope bridge deck asphalt pavement and simulates the interaction between pavement and bridge and calculates the maximum shear stress in a different slope at different temperatures. Finally the paper discusses the shear criteria of the large longitudinal slope bridge deck asphalt pavement.