The Research On Interfacial Sherar And Creep Constitutive Relation Of Large-Size Asphalt Mixture

Since the Large-size Asphalt Mixture(LAM) is good at depressing reflective cracking,it is took for cracking relief layer and widely applied to Asphalt Concrete Overlay (ACO) on the Old Portland Cement Concrete Pavement(OPCCP) in recent year.Currently,the research of LAM anti-cracking mechanism is less,that cann’t give full play to its high anti-cracking performance.It is important to research the constitutive model of LAM for revealing the deformation law of mixture,preventing and containing the damage of mixture. Based on theoretical analysis and test,this dissertation focus the research on establishing the interface sliping constitutive model and creeping constitutive model of LAM and proposing the method to solve parameters of models.Establishing the interface sliping constitutive model of asphalt mastic-aggregate.According to the basic theories of viscoelastic mechanics, the derivation of interface sliping constitutive model is executed,and the interface sliping constitutive model of asphalt asphalt mastic-aggregate, under the combined action of normal stress and shear stress,is established.Besides,the methods are proposed to solve parameters of model. Comparing the predicted and experimental values,it is confirmed that the model can reflect the shear-creeping deformation characteristics of asphalt mastic-aggregate interface.Establishing the misco-elastic plastic damage constitutive model of Large-size and Porous Asphalt Mixture. On the basic of misco-elastic model, a visco-plastic unit is contacted to express visco-plastic deformation,and mixture injury is described by the law of Kachanov creep damage. Comparing the predicted and experimental values,it is confirmed that the model can reflect the creeping deformation characteristics of Large-size and Porous Asphalt Mixture.