摘要: |
The aim of this work was to characterize the creep and recovery of conventional (VG 10) and polymer (EVA, SBS) modified binder for different stress levels at a temperature of 60°C. Creep and recovery test on binders were conducted using dynamic shear rheometer at five different stress levels, viz. 25, 100,1000,10000 and 30000 Pa. The percent creep recovery and non-recoverable creep compliance were analyzed explicitly. Burger's four element model was used to fit the creep and recovery data, and the model parameters were studied. It was found that modified binders performed considerably well than the conventional base binder. Modified binders showed delayed elastic response which depleted with increase in stress levels. SBS modified binder was least susceptible to change in stress amplitude, while EVA was found to be highly rut resistant. Burger's model gave excellent fit with the creep and recovery data, both in the linear and nonlinear viscoelastic range of stress levels. |