Abstract

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Title:: Experiment and Numerical Simulation on Impact Resistance of Composite Pavement Slab

Author(s):: WU Jun; LI Liang; DU Xiu-li; School of Urban Railway Transportation, Shanghai University of Engineering Science

Keywords:: drop weight impact; constitutive model; interface model; composite pavement slab

Abstract:: The experiment on dynamic response of a new composite pavement slab under impact load was evaluated. The new composite pavement structure consisted of asphalt concrete (AC) layer reinforced with geogrid, followed by high strength concrete (HSC) layer and then engineered cementitious composites (ECC) layer. The damage forms and deformations of the composite pavement structure were gained by drop weight test, and the dynamic behavior of concrete materials in composite pavement structure system was simulated by concrete damage material model. The main parameters of the material model were verified and determined, including the interface characteristics and the dynamic growth factor of the materials in each layer. According to the test results of the laboratory impact drop hammer of the new composite pavement system, the numerical model was checked and verified by comparing the failure form, damage diameter and displacement value.The results show that the 3D numerical model considering interfacial properties and dynamic growth factor can accurately simulate the real behavior of composite pavement system under impact load, and the model can be used to study the effects of different factors (materials strength, fracture energy and interlayer interface) on the impact resistance of new composite pavement system under different impact loads.