Dynamic Load Response Characteristics of Asphalt Mixtures and Viscoelastic Mechanics Analysis of Asphalt Pavement
Based on the asphalt pavement engineering case of East Sixth Ring Road Renewal Project in Beijing,indoor testing methods are used to study the dynamic response characteristics of asphalt mixtures under cyclic vehicle live loads,as well as the viscoelastic mechanical changes under the coupling effect of vehicle loads and various natural factors.The research results indicate that the cumulative strain dynamic response of asphalt mix-ture has gone through two stages.In the first stage,the cumulative strain dynamic response of asphalt mixture shows a gradual increase.In the second stage,there is no significant change in the overall cumulative strain of as-phalt mixture,and the stress of asphalt mixture is not significantly affected by the cyclic dynamic load of vehi-cles.As the loading frequency gradually increases,the dynamic modulus of asphalt mixture also shows a logarith-mic increase.With the increase of temperature,the dynamic modulus of asphalt mixture gradually decreases,and the magnitude of the decrease gradually decreases.The phase angle of the asphalt mixture shows a logarithmic increase trend when the load loading frequency is not more than 10 Hz,and a linear decrease trend when the loading frequency is overl0 Hz.With the increase of temperature,the phase angle of the asphalt mixture continu-ously decreases,and the magnitude of the decrease continuously decreases.
万方数据
维普
