The Skew Shearing Test Study On Asphalt Bridge Deck Overlays

Recent years, the more and more researches of deck pavement over the world focus on the numerical simulation of asphalt mixture layer, the material application and the waterproof cohesive layer. There is little analysis on interlayer stressing state of deck pavement. The stressing state of deck pavement under the vehicle load is analyzed by simulating the indoor skew shearing test in this paper, providing reference for the practical engineering design.Firstly, the research situation of asphalt pavement on cement concrete bridge both at home and abroad is summarized. The damage types of deck pavement are classified, combining with the investigation data of asphalt pavement on cement concrete bridge at home and abroad. The damage reasons are analyzed from the aspects of design, material, environment and construction.Secondly, the model of deck pavement is analyzed by finite element software ANSYS to get its stress and strain distribution. It is found that the waterproof cohesive layer and the higher layer of deck pavement are the weak location of pavement system. The requirement of shear strength of deck pavement layers and waterproof cohesive layer should be taken into consideration in design. Therefore, five kinds of test scheme are designed to reflect the shear performance of waterproof cohesive layer and pavement layers of the specimen, And The rationality the five kinds of test shcheme are evaluated.The shear performance of waterproof cohesive layer and pavement layers can be reflected well by the finite element analysis of test schemes. The influences of the thickness and modulus of asphalt mixture pavement layers and cohesive layer to the stress state of specimen are calculated, providing theoretical basis for legitimate selection of asphalt deck pavement. The results show that the increase of the thickness of deck pavement and the modulus ratio of higher and lower layers can both improve the shear performance of deck pavement. The cohesive layer with epoxy asphalt gets better shear performance than that with SBS modified asphalt. The increase of the thickness of cohesive layer has little effect on the shear performance of deck pavement. The ways of the test are analysed, the result of calculation of Ansys finite element are compared with the result of the test, the results show that this five kinds of test shcheme are basicly evaluated the stress state of the pavement.