REPEATED LOAD TRIAXIAL TEST on ASPHALT MIXTURE of STEEL BRIDGE DECK and ITS SIMULATION by FEM
In this study, two types of typical steel deck pavement mixture, MA (mastic asphalt) and SMA (stone mastic asphalt), are invited and their high temperature performance is evaluated through repeated load triaxial test. It’s found that the natures of the deformation development of the two mixtures, as well as the response manners to different load condition, are completely different, while the results show that SMA has an overwhelmingly excellent performance of deformation resistance under high temperature. Then, through multivariate linear regressive analyses of the triaxial test results, the non-linear parameters A, m and n of the asphalt mixtures are obtained, which will be applied to the creep model built by the finite element program of ABAQUS to simulate the process of repeated load triaxial test and make the prediction of the deformation possible. The results calculated by FEM and the actual deformation measured in the test are compared to validate the reliability of the FEM prediction method. It is found that the error of the two approaches turns out to be 10% or so, which indicates that the application of the nonlinear parameters obtained by multivariate linear regressive analyses from the triaxial test results is reliable, and these parameters are qualified to be employed to conduct the rutting prediction of steel bridge asphalt pavement.