Viscoelastoplastic constitutive model for creep deformation behavior of asphalt sand

摘要

A uniaxial viscoelastoplastic model that can describe whole creep behaviors of asphalt sand at different temperatures was presented. The model was composed of three submodels in series, which describe elastoplastic, viscoelastic and viscoplastic characteristics respectively. The constitutive equation was established for uniaxial loading condition, and the creep representation was also obtained. The constitutive parameters were determined by uniaxial compression tests under controlled-stress of 0.1 Mpa with five different test temperatures of 20, 40, 45, 50 and 60°C. Expressions of the model parameters in terms of temperatures were also given. The model gave prediction at various temperatures consistent with the experimental results, and can reflect the total deformation characterization of asphalt sands.