Visco-elastoplastic damage constitutive model for compressed asphalt mastic
来源期刊：中南大学学报(英文版)2014年第10期
论文作者：ZENG Guo-wei(曾国伟) YANG Xin-hua(杨新华) BAI Fan(白凡) GAO Hu(高虎)
文章页码：4007 - 4013
Key words：asphalt mastic; visco-elastoplastic damage model; compressive creep
Abstract: In order to describe the three-stage creep behavior of compressed asphalt mastic, a visco-elastoplastic damage constitutive model is proposed in this work. The model parameters are treated as quadratic polynomial functions with respect to stress and temperature. A series of uniaxial compressive creep experiments are performed at various stress and temperature conditions in order to determine these parameter functions, and then the proposed model is validated by comparison between the predictions and experiments at the other loading conditions. It is shown that very small permanent deformation at low stress and temperature increases rapidly with elevated stress or temperature and the damage may initiate in the stationary stage but mainly develops in the accelerated stage. Compared with the visco-elastoplastic models without damage, the predictions from the proposed model is in better agreement with the experiments, and can better capture the rate-dependency in creep responses of asphalt mastic especially below its softening point of 47 °C.
ZENG Guo-wei(曾国伟)1, 2, YANG Xin-hua(杨新华)1, BAI Fan(白凡)1, GAO Hu(高虎)1
(1. School of Civil Engineering and Mechanics, Huazhong University of Science and Technology,
Wuhan 430074, China;
2. School of Science, Wuhan University of Science and Technology, Wuhan 430065, China)
Abstract:In order to describe the three-stage creep behavior of compressed asphalt mastic, a visco-elastoplastic damage constitutive model is proposed in this work. The model parameters are treated as quadratic polynomial functions with respect to stress and temperature. A series of uniaxial compressive creep experiments are performed at various stress and temperature conditions in order to determine these parameter functions, and then the proposed model is validated by comparison between the predictions and experiments at the other loading conditions. It is shown that very small permanent deformation at low stress and temperature increases rapidly with elevated stress or temperature and the damage may initiate in the stationary stage but mainly develops in the accelerated stage. Compared with the visco-elastoplastic models without damage, the predictions from the proposed model is in better agreement with the experiments, and can better capture the rate-dependency in creep responses of asphalt mastic especially below its softening point of 47 °C.
Key words:asphalt mastic; visco-elastoplastic damage model; compressive creep
