The 'DBN' Model: A Thermo-Visco-Elasto-Plastic Approach for Pavement Behavior Modeling

摘要

Asphalt mixture behavior is complex. Following applied loading, very different types of properties can be observed, such as linear viscoelasticity (LVE) for very small strain amplitudes, non linearity for higher strains, fatigue or rutting for a great number of cycles, brittle or ductile failure, thixotropy and healing. These different “typical” kinds of behavior are introduced. Then, the proposed “DBN” (Di Benedetto-Neifar) law is presented. This law is very versatile and provides an effective means of describing the different typical mix behaviors by using the same formalism. The complexity of the description and the number of constants can be different depending on the desired sophistication for the modeling. In particular, some comparisons between experimental Direct Tensile Test (DTT) and Thermal Stress Restrained Specimen Test (TSRST) results and numerical simulations based on the DBN law are presented. Some aspects of the model still need further research work.