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R. Blab, B. Hofko:
"Triaxial Cyclic Compression Tests for Parameter Identification of Advanced Rheological Models to predict Rutting Potential of Asphalt Mixes";
Vortrag: 8th World Congress on Computational Mechanics (WCCM VIII) and 5th European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2008), Venice, Italy (eingeladen); 30.06.2008 - 04.07.2008.

For modelling hot mix asphalt (HMA) rutting behaviour at high temperatures several rheological material models, i.e. Huet´s and Huet-Sayegh´s model, are described in literature. In order to facilitate such models in finite element method (FEM)-simulation for rutting prediction, the models´ parameters have to be identified from experimental data. This data are usually derived from cyclic stiffness tests at different temperatures and load frequencies. However, stiffness tests at low strain amplitudes stimulate the visco-elastic characteristics of HMAs but do not address plastic material characteristics. Therefore, FE simulation results of HMA structures using material parameter derived from stiffness tests cannot reflect field performance since the plastic parts of the material behaviour of HMA are not taken into account when deriving model parameters from stiffness tests. This paper presents a new approach how to derive reasonable parameters of advanced rheological material models from cyclic triaxial material tests, i.e. triaxial cyclic compression tests (TCCT), that also take into account plastic material characteristics at high temperatures.

triaxial cyclic compression test, asphalt, HMA, Spurrinne