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摘要
Based on Schapery viscoelastic model theory, and then combined with improved Swchartz viscoplastic model, an improved integral constitutive model was proposed to study the nonlinear creep recovery behavior of crumb rubber asphalt sand. A series of compressive creep tests were conducted on crumb rubber asphalt sand, and then the experimental data were fitted by the least squares and improved Euler method to determine the parameters in the model. Finally, the model was used to predict the creep recovery behavior of crumb rubber asphalt sand at different stress levels. The result shows that the creep constitutive model can not only accurately describe the complex nonlinear viscoelastic-plastic behavior of crumb rubber asphalt sand during the creep process, but also can be used to predict the creep characteristics of crumb rubber asphalt sand with different stress levels. Compared to other models, the parameter determination of the proposed model parameters is simple and convenient. ? 2019, Central South University Press. All right reserved.
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