The Research Of Structure And Mechanical Characteristic Of Composite Concrete Pavement

Composite material is an old conception.It can not only maintain the advantages of each component,but also obtain the comprehensive performance through the complementarity and correlation of each component,which is cannot be achieved by a single one.The concept of composite concrete pavement is based on the mechanical model of composite slab.Through the calculation of fatigue strength and ultimate strength,the thickness of composite slab can be obtained.Based on the composite slab model,there are several mechanical properties such as compression resistant capability,flexure-tension resistant capability and shear behavior could be calculated and compared with different elastic modulus of concrete.In the experiment,using the mix proportion of concrete C20 and C30,pouring them into the compression resistance mould(150mm×150mm×150mm),flexure-tension resistant mould(550mm×150mm×150mm).The experimental result shows that the compressive modulus and flexural modulus of composite strength are always greater than C20 concrete and less than C30 concrete.In this paper,the finite element analysis method is used to analyze the mechanical response,the stress and displacement of the composite concrete pavement under traffic load.On the basis of the elastic modulus and Poisson's ratio of composite concrete materials,establishing a three-dimensional finite element model of pavement structure considering the influence of joints.The paper uses ABAQUS finite element software to simulate and calculate the stress and vertical displacement of the composite cement concrete pavement under the action of traffic load.Then,the critical load position of the composite concrete pavement can be determined,and analyse influence of the thickness of the composite concrete pavement,the modulus of the composite concrete pavement,the thickness of the base,the modulus of the base and the Foundational Response Modulus under the traffic load.