Non-linearity Viscoelasticity Model Of Aged Asphalt Mixture

As the main high-grade construction materials, while at the same time is a complex thermal rheological materials, asphalt mixture deformation with a variety of factors, including stress state, temperature, loading rate and stress level, so it has a complex non-linear nature. it is complicated nonlinear nature. For its mechanical properties, research of this study stress the level of its viscoelastic properties, the establishment of asphalt concrete non-linear viscoelastic model.Through different degrees of aging asphalt mixture of different AC-13C temperatures, with different stress levels of stress relaxation tests, the extent of different aging of the asphalt mixture master curve of relaxation modulus cluster, according to exponential model fractional characterization of asphalt mixtures the stress relaxation performance of the application of non-linear regression method at the same time by the different degree of aging of asphalt mixtures at different strain of visco-elastic model parameter values, in accordance with the parameters and the aging time, strain and temperature to determine the ultimate non-linear of visco-elastic model.According to the result of the stress relaxation test of asphalt mixture at different aging degree, and based on the Free-Volume-Theory of material viscidity, the relation between aging and temperature of asphalt mixture is deduced, which shows that the aging relaxation modulus can be replaced by the non-aging at the lower stress state.Finally, in above work foundation, has analyzed the deficiency which this article studied still exists, and to the development which one step worked, proposed some viewpoints and the suggestion.