Abstract

Info

Title:: Nonlinear creep model of asphalt mixture and parameter determination

Author(s):: ZHANG Jiu-Peng¹; HUANG Xiao-ming²; GAO Ying²; 1.Key Laboratory for Special Area Highway Engineering of Ministry of Education,Chang’an University,Xi’an 710064,Shaanxi,China;2.School of Transportation,Southeast University,Nanjing 210096,Jiangsu,China

Keywords:: road engineering; asphalt mixture; nonlinear creep model; stability; parameter determination

Abstract:: Based on the threephase creep character and the complete stressstrain curve of asphalt mixture, the viscoelastic spring of Burgers model was modified and a nonlinear creep model was established, in which the viscoelastic spring module gradually decreased when the strain increased. Then, the constitutive relationship of nonlinear model was deduced, and the expressions of creep strain, creep rate and creep acceleration were also given. Meantime, the model stability condition and creep rupture time was defined by analyzing the stability of the nonlinear model, and the parameter determination method was established by the principle of least square. Finally, the proposed model was verified through two experimental examples. It is indicated that the nonlinear model can clearly describe the threephase creep, especially the accelerating creep stage, and the creep rupture time can also be used as a new index to research the creep character of asphalt mixture. 2 tabs, 5 figs, 10 refs.