| Popis: |
The high temperature characteristic of asphalt is closely associated with the performance of asphalt pavement. In this paper, repeated creep and recovery experiments are conducted for 2 kinds of base asphalt and 4 different kinds of modified asphalt. According to the pavement situation of China, two temperature levels (i.e., 60 °C and 70 °C) and two stress levels (120Pa and 300Pa) are selected in the test. We observe improved performance of the modified asphalt than the base asphalt, owing to the fact that the modified asphalt is a linear viscoelastic material, with special delayed elastic deformation and recovery properties. The high temperature performance of the modified asphalt is vulnerable to changes in temperature, stress and loads. We further perform rutting test and find that result is highly correlated with the viscous composition of creep stiffness (Gv), with the correlation coefficient being 0.9838 and 0.9813, respectively, indicating that Gv can well judge the merits of high temperature performance of different asphalt. |
